Related literature {#sec1}
==================

For related literature, see: Bazan *et al.* (1993[@bb2]); Tomlinson *et al.* (2005[@bb6]); Wang *et al.* (2006[@bb7]).

Experimental {#sec2}
============

 {#sec2.1}

### Crystal data {#sec2.1.1}

\[Dy(C~8~H~22~B~4~Si~2~)Cl(C~6~H~16~N~2~)\]*M* *~r~* = 531.84Monoclinic,*a* = 11.4467 (8) Å*b* = 14.862 (1) Å*c* = 13.8615 (9) Åβ = 92.770 (1)°*V* = 2355.4 (3) Å^3^*Z* = 4Mo *K*α radiationμ = 3.39 mm^−1^*T* = 293 (2) K0.80 × 0.30 × 0.30 mm

### Data collection {#sec2.1.2}

Bruker SMART CCD PLATFORM diffractometerAbsorption correction: multi-scan *SADABS* (Sheldrick, 2006[@bb4]) *T* ~min~ = 0.257, *T* ~max~ = 0.36217271 measured reflections4151 independent reflections4142 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.019

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.024*wR*(*F* ^2^) = 0.050*S* = 1.444151 reflections231 parametersH atoms treated by a mixture of independent and constrained refinementΔρ~max~ = 0.64 e Å^−3^Δρ~min~ = −0.61 e Å^−3^

 {#d5e411}

Data collection: *SMART* (Bruker, 2003[@bb3]); cell refinement: *SMART* and *SAINT* (Bruker, 2003[@bb3]); data reduction: *SAINT* (Bruker, 2003[@bb3]); program(s) used to solve structure: *SIR97* (Altomare *et al.*, 1999[@bb1]); program(s) used to refine structure: *SHELXTL* (Sheldrick, 2008[@bb5]); molecular graphics: *SHELXTL*; software used to prepare material for publication: *SHELXTL*.

Supplementary Material
======================

Crystal structure: contains datablocks global, I. DOI: [10.1107/S1600536808013615/si2081sup1.cif](http://dx.doi.org/10.1107/S1600536808013615/si2081sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S1600536808013615/si2081Isup2.hkl](http://dx.doi.org/10.1107/S1600536808013615/si2081Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?si2081&file=si2081sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?si2081sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?si2081&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [SI2081](http://scripts.iucr.org/cgi-bin/sendsup?si2081)).

This work was supported by Northern Illinois University and by grants from the donors of the Petroleum Research Fund, administered by the American Chemical Society, and the National Science Foundation. JAM thanks the Robert A. Welch Foundation (grant N-1322).

Comment
=======

The lanthanacarboranes (LnC~2~B~4~) cage systems are of interest in that their structural chemistry depends on the number and nature of the metal ligands other than the particular carborane. For example, the reaction of the tetrahydrofuran (THF) solvated dilithium compounds of B~4~C~8~H~22~Si~2~^2-^ with LnCl~3~ in 2:1 molar ratios produced exclusively a trinuclear clusters (Tomlinson *et al.* 2005, Wang *et al.* 2006, and literature cited therein). The methoxide and oxide ions were thought to be the result of a degradation of the THF molecules. This is consistent with the observation that the reaction of the TMEDA lithiacarboranes with LnCl~3~ in 2:1 molar ratios gave the expected full sandwich lanthanacarboranes. This tendency for TMEDA to disrupt complex aggregation and alter the course of a metalation reactions was also found in the d-block metals. The reaction of the THF solvated dilithium salts of B~4~C~8~H~22~Si~2~^2-^ with either CoCl~2~ or NiCl~2~ induced a metal disproportion reaction yielding *commo*-complexes and the respective metals. On the other hand, similar reactions with the TMEDA-solvated carborane dianions produced the corresponding *closo*-compound (Tomlinson *et al.* 2005). The reaction of a *nido*-compound with a number of lanthanide halides in 2:1 carborane-to-lanthanide molar ratios produced only the corresponding dimers (Wang *et al.* 2006). The presence of the reactive chlorides made these compounds potentially useful precursors in the syntheses of other lanthanacarboranes. Since dimer formation is thought to inhibit the reactions of the metallacatboranes (Bazan *et al.* 1993), the synthesis of a monomeric dysprosacarborane was attempted by the reaction of DyCl~3~ and the *nido*-compound, giving the title compound. The structure of the title compound, shown in Figure 1, is somewhat surprising in that it still remains a dimer. The structure consists of two half-sandwich units bridged at the B4, B5 positions by two pairs of B---H---Dy bonds. The average coordination bond distances (Å) are: Dy---Cl 2.5851 (9), Dy---N1 2.598 (3), Dy---N2 2.698 (3), Dy---B4,B5 2.728 (4), 2.692 (4), Dy-av(C1, C2, B3, B4, B5) 2.720 and the corresponding bond angles (°) are Cl---Dy---N1 95.98 (7), Cl---Dy---B5 143.74 (8), N(1)---Dy---N(2) 68.3 (1), B(5)---Dy---B(4) 35.7 (1). The Dy-av(C~2~B~3~) distance of 2.712Å and the Dy---Cl distance of 2.5851 (9) Å in the structure are similar to the values of 2.717 Å and 2.5757 (14) Å, respectively, found in anther Dy compound (Wang *et al.* 2006). This is one of the few instances where the substitution of THF by TMEDA molecules does not change either the cluster or intermolecular geometries.

Experimental {#experimental}
============

The reaction of DyCl~3~ with the TMEDA solvated monosodium *nido*- compound, *nido*-1-Na(TMEDA)2--2,3-(SiMe~3~)~2~-2,3-C~2~B~4~H~4~, in a 1:2 molar ratio in dry benzene at 60° C produced the corresponding half sandwich carborane in 88% yield.

Refinement {#refinement}
==========

The hydrogen atoms on carbon atoms were refined using the riding model in *SHELXL* with the *U*~iso~ equal to 1.5 times of that of the preceding carbon atoms for the methyl groups and 1.3 times for the rings. The C---H distances are equal to 0.97 and 0.96 Å for the CH~2~ and CH~3~ groups, respectively. The hydrogen atoms attached to boron atoms were located using the difference map, those of the carborane ring were refined using the riding model with B---H distances 0.93 Å. The hydrogen atom attached to B6 was refined with an isotropic displacement parameter with B---H distance 0.96 Å. The *U*~iso~(H) = 1.2 times *U*~eq~(B3,B4,B5).

Figures
=======

![Thermal ellipsoid drawing of the title compound shown at the 30% probability level. Atoms of the symmetry related moiety of the dimer complex are indicated \"A\" (symmetry code 1 - x, 2 - y, 1 - z).](e-64-0m799-fig1){#Fap1}

![Reaction scheme](e-64-0m799-fig2){#Fap2}

Crystal data {#tablewrapcrystaldatalong}
============

  --------------------------------------------- --------------------------------------
  \[Dy(C~8~H~22~B~4~Si~2~)Cl(C~6~H~16~N~2~)\]   *F*~000~ = 1068
  *M~r~* = 531.84                               *D*~x~ = 1.500 Mg m^−3^
  Monoclinic, *P*2~1~/*n*                       Mo *K*α radiation λ = 0.71073 Å
  Hall symbol: -P 2yn                           Cell parameters from 562 reflections
  *a* = 11.4467 (8) Å                           θ = −14--14º
  *b* = 14.8624 (10) Å                          µ = 3.39 mm^−1^
  *c* = 13.8615 (9) Å                           *T* = 293 (2) K
  β = 92.7700 (10)º                             Column, colorless
  *V* = 2355.4 (3) Å^3^                         0.80 × 0.30 × 0.30 mm
  *Z* = 4                                       
  --------------------------------------------- --------------------------------------

Data collection {#tablewrapdatacollectionlong}
===============

  ----------------------------------------------------------- --------------------------------------
  Bruker SMART CCD PLATFORM diffractometer                    4151 independent reflections
  Radiation source: fine-focus sealed tube                    4142 reflections with *I* \> 2σ(*I*)
  Monochromator: graphite                                     *R*~int~ = 0.019
  Detector resolution: 0 pixels mm^-1^                        θ~max~ = 25.0º
  *T* = 293(2) K                                              θ~min~ = 2.0º
  ω scans                                                     *h* = −13→13
  Absorption correction: multi-scanSADABS (Sheldrick, 2006)   *k* = −17→17
  *T*~min~ = 0.257, *T*~max~ = 0.362                          *l* = −16→16
  17271 measured reflections                                  
  ----------------------------------------------------------- --------------------------------------

Refinement {#tablewraprefinementdatalong}
==========

  ---------------------------------------------------------------- ----------------------------------------------------------------------------------
  Refinement on *F*^2^                                             Secondary atom site location: difference Fourier map
  Least-squares matrix: full                                       Hydrogen site location: inferred from neighbouring sites
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.024                              H atoms treated by a mixture of independent and constrained refinement
  *wR*(*F*^2^) = 0.050                                               *w* = 1/\[σ^2^(*F*~o~^2^) + 3.9928*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  *S* = 1.44                                                       (Δ/σ)~max~ = 0.013
  4151 reflections                                                 Δρ~max~ = 0.64 e Å^−3^
  231 parameters                                                   Δρ~min~ = −0.61 e Å^−3^
  Primary atom site location: structure-invariant direct methods   Extinction correction: none
  ---------------------------------------------------------------- ----------------------------------------------------------------------------------

Special details {#specialdetails}
===============

  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Geometry. All e.s.d.\'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.\'s are taken into account individually in the estimation of e.s.d.\'s in distances, angles and torsion angles; correlations between e.s.d.\'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.\'s is used for estimating e.s.d.\'s involving l.s. planes.
  Refinement. Refinement of *F*^2^ against ALL reflections. The weighted *R*-factor *wR* and goodness of fit *S* are based on *F*^2^, conventional *R*-factors *R* are based on *F*, with *F* set to zero for negative *F*^2^. The threshold expression of *F*^2^ \> σ(*F*^2^) is used only for calculating *R*-factors(gt) *etc*. and is not relevant to the choice of reflections for refinement. *R*-factors based on *F*^2^ are statistically about twice as large as those based on *F*, and *R*- factors based on ALL data will be even larger.
  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å^2^) {#tablewrapcoords}
==================================================================================================

  ------ --------------- --------------- --------------- -------------------- --
         *x*             *y*             *z*             *U*~iso~\*/*U*~eq~   
  Dy     0.584689 (12)   0.954047 (10)   0.626856 (11)   0.02053 (6)          
  Cl     0.65147 (8)     0.79787 (6)     0.69040 (8)     0.0406 (2)           
  Si1    0.37951 (8)     0.73248 (6)     0.55959 (7)     0.0268 (2)           
  Si2    0.31576 (8)     0.84186 (6)     0.80092 (7)     0.0269 (2)           
  C1     0.3894 (3)      0.8543 (2)      0.5966 (2)      0.0205 (6)           
  C2     0.3757 (3)      0.8993 (2)      0.6921 (2)      0.0221 (7)           
  B3     0.3682 (3)      1.0040 (3)      0.6794 (3)      0.0249 (8)           
  H3     0.3640          1.0465          0.7285          0.030\*              
  B4     0.3693 (3)      1.0245 (2)      0.5630 (3)      0.0233 (8)           
  H4     0.3622          1.0799          0.5320          0.028\*              
  B5     0.3862 (3)      0.9239 (2)      0.5134 (3)      0.0217 (7)           
  H5     0.3926          0.9117          0.4481          0.026\*              
  B6     0.2804 (3)      0.9338 (3)      0.6029 (3)      0.0239 (8)           
  C7     0.4863 (4)      0.7136 (3)      0.4645 (3)      0.0501 (11)          
  H7A    0.4791          0.6531          0.4410          0.075\*              
  H7B    0.5642          0.7232          0.4914          0.075\*              
  H7C    0.4707          0.7550          0.4123          0.075\*              
  C8     0.2302 (4)      0.7083 (3)      0.5048 (3)      0.0472 (11)          
  H8A    0.1723          0.7344          0.5441          0.071\*              
  H8B    0.2185          0.6444          0.5012          0.071\*              
  H8C    0.2230          0.7336          0.4411          0.071\*              
  C9     0.4155 (3)      0.6475 (2)      0.6554 (3)      0.0380 (9)           
  H9A    0.3536          0.6453          0.6996          0.057\*              
  H9B    0.4873          0.6639          0.6896          0.057\*              
  H9C    0.4242          0.5894          0.6262          0.057\*              
  C10    0.1876 (3)      0.7697 (3)      0.7643 (3)      0.0372 (9)           
  H10A   0.1693          0.7311          0.8170          0.056\*              
  H10B   0.2062          0.7338          0.7095          0.056\*              
  H10C   0.1214          0.8072          0.7474          0.056\*              
  C11    0.4250 (4)      0.7748 (3)      0.8752 (3)      0.0450 (10)          
  H11A   0.4679          0.8139          0.9191          0.068\*              
  H11B   0.4780          0.7458          0.8335          0.068\*              
  H11C   0.3850          0.7300          0.9112          0.068\*              
  C12    0.2567 (4)      0.9287 (3)      0.8824 (3)      0.0436 (10)          
  H12A   0.3179          0.9698          0.9023          0.065\*              
  H12B   0.2270          0.9000          0.9382          0.065\*              
  H12C   0.1947          0.9611          0.8487          0.065\*              
  N1     0.6388 (3)      1.0410 (2)      0.7853 (2)      0.0323 (7)           
  C13    0.7672 (3)      1.0466 (3)      0.8066 (3)      0.0430 (10)          
  H13A   0.7826          1.0429          0.8760          0.052\*              
  H13B   0.7950          1.1046          0.7854          0.052\*              
  C14    0.8344 (3)      0.9737 (3)      0.7587 (3)      0.0367 (9)           
  H14A   0.9169          0.9798          0.7768          0.044\*              
  H14B   0.8086          0.9155          0.7812          0.044\*              
  N2     0.8178 (3)      0.9778 (2)      0.6525 (2)      0.0345 (7)           
  C15    0.5868 (4)      0.9852 (3)      0.8603 (3)      0.0442 (10)          
  H15A   0.6170          0.9250          0.8572          0.066\*              
  H15B   0.5034          0.9840          0.8496          0.066\*              
  H15C   0.6064          1.0102          0.9229          0.066\*              
  C16    0.5897 (4)      1.1327 (3)      0.7910 (3)      0.0464 (10)          
  H16A   0.6069          1.1570          0.8543          0.070\*              
  H16B   0.5064          1.1303          0.7788          0.070\*              
  H16C   0.6237          1.1704          0.7436          0.070\*              
  C17    0.8846 (3)      0.9040 (3)      0.6097 (4)      0.0554 (12)          
  H17A   0.9663          0.9113          0.6268          0.083\*              
  H17B   0.8727          0.9054          0.5407          0.083\*              
  H17C   0.8581          0.8474          0.6338          0.083\*              
  C18    0.8693 (4)      1.0633 (3)      0.6189 (3)      0.0517 (12)          
  H18A   0.9477          1.0692          0.6460          0.078\*              
  H18B   0.8230          1.1130          0.6392          0.078\*              
  H18C   0.8706          1.0628          0.5497          0.078\*              
  H6     0.191 (3)       0.916 (2)       0.600 (3)       0.029 (9)\*          
  ------ --------------- --------------- --------------- -------------------- --

Atomic displacement parameters (Å^2^) {#tablewrapadps}
=====================================

  ----- ------------- ------------- ------------- -------------- -------------- --------------
        *U*^11^       *U*^22^       *U*^33^       *U*^12^        *U*^13^        *U*^23^
  Dy    0.01951 (8)   0.01862 (9)   0.02317 (9)   −0.00146 (6)   −0.00200 (6)   0.00244 (6)
  Cl    0.0311 (5)    0.0249 (4)    0.0647 (6)    0.0002 (4)     −0.0081 (4)    0.0114 (4)
  Si1   0.0314 (5)    0.0189 (5)    0.0301 (5)    −0.0025 (4)    0.0010 (4)     −0.0016 (4)
  Si2   0.0303 (5)    0.0268 (5)    0.0238 (5)    −0.0015 (4)    0.0049 (4)     0.0036 (4)
  C1    0.0178 (15)   0.0198 (16)   0.0238 (16)   −0.0006 (12)   0.0005 (12)    0.0010 (13)
  C2    0.0196 (16)   0.0224 (16)   0.0242 (17)   −0.0003 (13)   0.0008 (13)    0.0005 (13)
  B3    0.0251 (19)   0.0226 (19)   0.027 (2)     0.0016 (15)    0.0014 (15)    −0.0026 (15)
  B4    0.0221 (18)   0.0163 (18)   0.031 (2)     0.0009 (14)    0.0003 (15)    0.0034 (15)
  B5    0.0184 (17)   0.0230 (19)   0.0237 (18)   −0.0028 (14)   −0.0002 (14)   −0.0003 (15)
  B6    0.0207 (18)   0.0231 (19)   0.028 (2)     0.0002 (15)    0.0010 (15)    0.0021 (15)
  C7    0.067 (3)     0.036 (2)     0.049 (3)     0.008 (2)      0.022 (2)      −0.0054 (19)
  C8    0.050 (3)     0.036 (2)     0.054 (3)     −0.0117 (19)   −0.019 (2)     −0.0039 (19)
  C9    0.039 (2)     0.0247 (19)   0.049 (2)     −0.0006 (16)   −0.0026 (18)   0.0039 (17)
  C10   0.033 (2)     0.040 (2)     0.040 (2)     −0.0074 (17)   0.0114 (17)    0.0021 (17)
  C11   0.048 (2)     0.045 (2)     0.041 (2)     0.0010 (19)    −0.0038 (19)   0.0168 (19)
  C12   0.053 (3)     0.042 (2)     0.036 (2)     −0.0025 (19)   0.0161 (19)    −0.0034 (18)
  N1    0.0360 (17)   0.0301 (16)   0.0303 (16)   −0.0061 (13)   −0.0058 (13)   −0.0029 (13)
  C13   0.037 (2)     0.047 (2)     0.044 (2)     −0.0102 (18)   −0.0129 (18)   −0.0051 (19)
  C14   0.0300 (19)   0.039 (2)     0.039 (2)     −0.0056 (16)   −0.0141 (16)   0.0089 (17)
  N2    0.0266 (15)   0.0383 (18)   0.0377 (17)   −0.0059 (13)   −0.0058 (13)   0.0031 (14)
  C15   0.052 (2)     0.053 (3)     0.027 (2)     −0.011 (2)     −0.0055 (18)   0.0033 (18)
  C16   0.053 (3)     0.034 (2)     0.052 (3)     −0.0002 (19)   −0.005 (2)     −0.0141 (19)
  C17   0.025 (2)     0.068 (3)     0.073 (3)     −0.001 (2)     0.002 (2)      −0.016 (3)
  C18   0.037 (2)     0.068 (3)     0.049 (3)     −0.023 (2)     −0.0137 (19)   0.020 (2)
  ----- ------------- ------------- ------------- -------------- -------------- --------------

Geometric parameters (Å, °) {#tablewrapgeomlong}
===========================

  -------------------- ------------- ------------------- -----------
  Dy---Cl              2.5851 (9)    C9---H9B            0.9600
  Dy---N1              2.598 (3)     C9---H9C            0.9600
  Dy---B5^i^           2.692 (4)     C10---H10A          0.9600
  Dy---N2              2.698 (3)     C10---H10B          0.9600
  Dy---C1              2.698 (3)     C10---H10C          0.9600
  Dy---C2              2.723 (3)     C11---H11A          0.9600
  Dy---B4^i^           2.728 (4)     C11---H11B          0.9600
  Si1---C7             1.861 (4)     C11---H11C          0.9600
  Si1---C9             1.865 (4)     C12---H12A          0.9600
  Si1---C8             1.872 (4)     C12---H12B          0.9600
  Si1---C1             1.884 (3)     C12---H12C          0.9600
  Si2---C12            1.864 (4)     N1---C15            1.477 (5)
  Si2---C10            1.867 (4)     N1---C16            1.477 (5)
  Si2---C11            1.869 (4)     N1---C13            1.487 (5)
  Si2---C2             1.890 (3)     C13---C14           1.502 (6)
  C1---C2              1.498 (4)     C13---H13A          0.9700
  C1---B5              1.548 (5)     C13---H13B          0.9700
  C1---B6              1.724 (5)     C14---N2            1.477 (5)
  C2---B3              1.568 (5)     C14---H14A          0.9700
  C2---B6              1.689 (5)     C14---H14B          0.9700
  B3---B4              1.642 (5)     N2---C17            1.478 (5)
  B3---H3              0.9300        N2---C18            1.485 (5)
  B4---B5              1.661 (5)     C15---H15A          0.9600
  B4---Dy^i^           2.728 (4)     C15---H15B          0.9600
  B4---H4              0.9300        C15---H15C          0.9600
  B5---Dy^i^           2.692 (4)     C16---H16A          0.9600
  B5---H5              0.9300        C16---H16B          0.9600
  B6---H6              1.06 (4)      C16---H16C          0.9600
  C7---H7A             0.9600        C17---H17A          0.9600
  C7---H7B             0.9600        C17---H17B          0.9600
  C7---H7C             0.9600        C17---H17C          0.9600
  C8---H8A             0.9600        C18---H18A          0.9600
  C8---H8B             0.9600        C18---H18B          0.9600
  C8---H8C             0.9600        C18---H18C          0.9600
  C9---H9A             0.9600                            
                                                         
  Cl---Dy---N1         95.98 (7)     Si1---C8---H8B      109.5
  Cl---Dy---B5^i^      143.74 (8)    H8A---C8---H8B      109.5
  N1---Dy---B5^i^      104.06 (10)   Si1---C8---H8C      109.5
  Cl---Dy---N2         78.36 (7)     H8A---C8---H8C      109.5
  N1---Dy---N2         68.26 (10)    H8B---C8---H8C      109.5
  B5^i^---Dy---N2      81.43 (10)    Si1---C9---H9A      109.5
  Cl---Dy---C1         77.81 (7)     Si1---C9---H9B      109.5
  N1---Dy---C1         124.51 (10)   H9A---C9---H9B      109.5
  B5^i^---Dy---C1      112.86 (10)   Si1---C9---H9C      109.5
  N2---Dy---C1         154.04 (9)    H9A---C9---H9C      109.5
  Cl---Dy---C2         82.45 (7)     H9B---C9---H9C      109.5
  N1---Dy---C2         92.59 (10)    Si2---C10---H10A    109.5
  B5^i^---Dy---C2      125.64 (10)   Si2---C10---H10B    109.5
  N2---Dy---C2         151.01 (9)    H10A---C10---H10B   109.5
  C1---Dy---C2         32.08 (9)     Si2---C10---H10C    109.5
  Cl---Dy---B4^i^      111.47 (8)    H10A---C10---H10C   109.5
  N1---Dy---B4^i^      135.13 (10)   H10B---C10---H10C   109.5
  B5^i^---Dy---B4^i^   35.69 (11)    Si2---C11---H11A    109.5
  N2---Dy---B4^i^      82.89 (10)    Si2---C11---H11B    109.5
  C1---Dy---B4^i^      96.39 (10)    H11A---C11---H11B   109.5
  C2---Dy---B4^i^      124.68 (10)   Si2---C11---H11C    109.5
  C7---Si1---C9        105.8 (2)     H11A---C11---H11C   109.5
  C7---Si1---C8        107.6 (2)     H11B---C11---H11C   109.5
  C9---Si1---C8        108.95 (19)   Si2---C12---H12A    109.5
  C7---Si1---C1        107.74 (17)   Si2---C12---H12B    109.5
  C9---Si1---C1        116.69 (16)   H12A---C12---H12B   109.5
  C8---Si1---C1        109.69 (17)   Si2---C12---H12C    109.5
  C12---Si2---C10      105.03 (19)   H12A---C12---H12C   109.5
  C12---Si2---C11      106.8 (2)     H12B---C12---H12C   109.5
  C10---Si2---C11      109.84 (19)   C15---N1---C16      108.3 (3)
  C12---Si2---C2       109.07 (17)   C15---N1---C13      108.6 (3)
  C10---Si2---C2       110.65 (16)   C16---N1---C13      108.3 (3)
  C11---Si2---C2       114.95 (17)   C15---N1---Dy       103.2 (2)
  C2---C1---B5         111.1 (3)     C16---N1---Dy       115.3 (2)
  C2---C1---B6         62.8 (2)      C13---N1---Dy       112.9 (2)
  B5---C1---B6         65.7 (2)      N1---C13---C14      113.2 (3)
  C2---C1---Si1        131.5 (2)     N1---C13---H13A     108.9
  B5---C1---Si1        116.1 (2)     C14---C13---H13A    108.9
  B6---C1---Si1        129.7 (2)     N1---C13---H13B     108.9
  C2---C1---Dy         74.86 (17)    C14---C13---H13B    108.9
  B5---C1---Dy         74.80 (17)    H13A---C13---H13B   107.7
  B6---C1---Dy         102.23 (18)   N2---C14---C13      111.5 (3)
  Si1---C1---Dy        127.49 (14)   N2---C14---H14A     109.3
  C1---C2---B3         110.6 (3)     C13---C14---H14A    109.3
  C1---C2---B6         65.2 (2)      N2---C14---H14B     109.3
  B3---C2---B6         65.6 (2)      C13---C14---H14B    109.3
  C1---C2---Si2        124.1 (2)     H14A---C14---H14B   108.0
  B3---C2---Si2        121.2 (2)     C14---N2---C17      109.0 (3)
  B6---C2---Si2        118.4 (2)     C14---N2---C18      108.3 (3)
  C1---C2---Dy         73.05 (17)    C17---N2---C18      106.7 (3)
  B3---C2---Dy         73.14 (18)    C14---N2---Dy       101.8 (2)
  B6---C2---Dy         102.27 (19)   C17---N2---Dy       112.2 (2)
  Si2---C2---Dy        139.32 (15)   C18---N2---Dy       118.4 (2)
  C2---B3---B4         106.9 (3)     N1---C15---H15A     109.5
  C2---B3---H3         126.5         N1---C15---H15B     109.5
  B4---B3---H3         126.5         H15A---C15---H15B   109.5
  B3---B4---B5         104.3 (3)     N1---C15---H15C     109.5
  B3---B4---Dy^i^      168.7 (2)     H15A---C15---H15C   109.5
  B5---B4---Dy^i^      70.97 (18)    H15B---C15---H15C   109.5
  B3---B4---H4         127.9         N1---C16---H16A     109.5
  B5---B4---H4         127.9         N1---C16---H16B     109.5
  Dy^i^---B4---H4      57.8          H16A---C16---H16B   109.5
  C1---B5---B4         107.0 (3)     N1---C16---H16C     109.5
  C1---B5---Dy^i^      171.5 (2)     H16A---C16---H16C   109.5
  B4---B5---Dy^i^      73.34 (18)    H16B---C16---H16C   109.5
  C1---B5---H5         126.5         N2---C17---H17A     109.5
  B4---B5---H5         126.5         N2---C17---H17B     109.5
  Dy^i^---B5---H5      53.8          H17A---C17---H17B   109.5
  C2---B6---C1         52.07 (18)    N2---C17---H17C     109.5
  C2---B6---H6         122.4 (19)    H17A---C17---H17C   109.5
  C1---B6---H6         122 (2)       H17B---C17---H17C   109.5
  Si1---C7---H7A       109.5         N2---C18---H18A     109.5
  Si1---C7---H7B       109.5         N2---C18---H18B     109.5
  H7A---C7---H7B       109.5         H18A---C18---H18B   109.5
  Si1---C7---H7C       109.5         N2---C18---H18C     109.5
  H7A---C7---H7C       109.5         H18A---C18---H18C   109.5
  H7B---C7---H7C       109.5         H18B---C18---H18C   109.5
  Si1---C8---H8A       109.5                             
  -------------------- ------------- ------------------- -----------

Symmetry codes: (i) −*x*+1, −*y*+2, −*z*+1.
