  Cyano-bridged bimetallic hybrid Prussian Blue one- to three-dimensional
(1D-3D) coordination polymers based on [M(CN)6]3- (M = Fe, Cr, Mn) have
attracted great attention because of their rich and interesting structures and
magnetic behaviors. The previous study implies that increasing dimensionality
may enhance and improve bulk magnetic properties.Our strategy for the rational
synthesis of high-dimensional network is to use a suitable combination of
cyanide groups and other bridging ligands. Here, 2,2'-bipyrimidine (bpym) was
selected, in preference to 4,4'-bipyrazine and pyrazine, because it is more
capable of transmitting magnetic interactions and its bis(chelating)
coordination modes facilitate connection between lanthanide ions. Unexpectedly,
two novel coordination polymers [NdM(bpym)(H2O)4(CN)6]3H2O (M = Fe 1, Co 2;)
were obtained, which have a unique 2D topological architecture, and exhibit
unusual magnetic behavior.
