C. Knoll, D. Müller, M. Seifried, G. Giester, Jan Welch, W. Artner, K. Hradil, M. Reissner, P. Weinberger:
"Cooperativity in spin crossover materials as ligand´s responsibility - investigations of the Fe(II)-1,3-bis((1H-tetrazol-1-yl)methyl)bicyclo [1.1.1]pentane system";
Dalton Transactions, 47 (2018), S. 5553 - 5557.

Kurzfassung englisch:
Criteria for a technologically relevant spin crossover (SCO) material
include temperature and abruptness. A series of Fe(II)-1,3-bis((1H-tetrazol-1-yl)methyl)bicyclo[1.1.1]pentane SCO complexes with various anions (BF4-, ClO4-, and PF6-) designed using a structure-property based concept is reported. All complexes feature abrupt SCO-behavior with T1/2 between 170 K and 187 K. These materials demonstrate that without stabilizing the effects of incorporated solvents or a hydrogen bond-network, the observed cooperativity during high-spin - low-spin transition is anion independent and originates only from the rigidity and internal strain of the propellane-moiety in the ligand. Spectroscopy and structural investigations of these materials are supported by quantum chemical

iron(II); spin crossover; tetrazole; propellane

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