Vacuum-evaporable spin-crossover complexes: physicochemical properties in the crystalline bulk and in thin films deposited from the gas phase

Four analogues of the spin-crossover complex [Fe(H 2 Bpz 2 ) 2 (phen)] (H 2 Bpz 2 = dihydrobis(pyrazolyl)borate; 2 ) containing functionalized 1,10-phenanthroline (phen) ligands have been prepared; i.e. , [Fe(H 2 Bpz 2 ) 2 (L)], L = 4-methyl-1,10-phenanthroline ( 3 ), 5-chloro-1,10-phenanthroline (...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2015-01, Vol.3 (30), p.7870-7877
Main Authors: Naggert, H., Rudnik, J., Kipgen, L., Bernien, M., Nickel, F., Arruda, L. M., Kuch, W., Näther, C., Tuczek, F.
Format: Article
Language:English
Subjects:
Crystal structure
Deposition
Gas phases
Ligands
Magnetic permeability
Physical vapor deposition
Solid state
Thin films
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Summary:Four analogues of the spin-crossover complex [Fe(H 2 Bpz 2 ) 2 (phen)] (H 2 Bpz 2 = dihydrobis(pyrazolyl)borate; 2 ) containing functionalized 1,10-phenanthroline (phen) ligands have been prepared; i.e. , [Fe(H 2 Bpz 2 ) 2 (L)], L = 4-methyl-1,10-phenanthroline ( 3 ), 5-chloro-1,10-phenanthroline ( 4 ), 4,7-dichloro-1,10-phenanthroline ( 5 ), and 4,7-dimethyl-1,10-phenanthroline ( 6 ). The systems are investigated by magnetic susceptibility measurements and a range of spectroscopies in the solid state and in thin films obtained by physical vapour deposition (PVD). Thermal as well as light-induced SCO behaviour is observed for 3–6 in the films. By contrast, thermal SCO in the solid state occurs only for 3 and 4 but is absent for 5 and 6 . These findings are discussed in the light of cooperative and intermolecular interactions.
ISSN:2050-7526
2050-7534
DOI:10.1039/C5TC00930H