  Among the different types of switchable molecular compounds, sublimable
Fe(II) SCO molecules provide a suitable platform to develop smart devices that
respond to external stimuli. Here we report the synthesis, crystallographic
structure and magnetic properties of three new neutral Fe(II) SCO molecules
belonging to the {Fe[H2B(pz)2]2(L)} family with bidentate-alpha-diimine ligands
L = 3-(pyridin-2-yl)-[1,2,3]triazolo[1,5-a]pyridine (tzpy),
5,5,6,6-tetrahydro-4H,4H-2,2-bi(1,3-thiazine) (btz) and
4,4,5,5-tetrahydro-2,2-bithiazole (bt) (1, 2 and 3, respectively), as well as
two solvated forms of 1 and 3. All three desolvated compounds present thermal-
and light-induced SCO transitions with different degrees of cooperativity and
effectiveness. Furthermore, 1 and 2 are demonstrated to be sublimable under HV
conditions affording homogeneous thin films 200 nm thick (TF1 and TF2) that
retain the chemical integrity of the original molecules regardless the
deposition surface. The SCO behaviour of the films is characterized by XAS
technique revealing the partial retainment of both thermal- and light-induced
spin transitions, yet losing the cooperativity. Finally, SCO/2D horizontal
hybrid devices based on CVD-graphene are produced using these films. Being the
first ones of this type utilizing molecules of {Fe[H2B(pz)2]2(L)} family, with
L = tzpy and btz, the devices have allowed the successful detection of the
thermal SCO transition through the electric properties of the CVD-graphene.
