Premium
Supramolecular Spintronic Devices: Spin Transitions and Magnetostructural Correlations in [Fe 4 II L 4 ] 8+ [2×2]‐Grid‐Type Complexes
Author(s) -
Ruben Mario,
Breuning Esther,
Lehn JeanMarie,
Ksenofontov Vadim,
Renz Franz,
Gütlich Philip,
Vaughan Gavin B. M.
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200304933
Subject(s) - spintronics , diamagnetism , crystallography , ligand (biochemistry) , magnetism , steric effects , spin crossover , spin states , supramolecular chemistry , spin (aerodynamics) , chemistry , spin transition , substituent , condensed matter physics , materials science , stereochemistry , physics , crystal structure , magnetic field , ferromagnetism , biochemistry , receptor , quantum mechanics , thermodynamics
The magnetism of a series of tetranuclear complexes of the [Fe II 4 L 4 ](X) 8 [2×2]‐grid‐type was investigated, revealing the occurrence of spin transition behavior within this class of compounds. The phenomenon depends directly on the nature of the substituent R 1 in the 2‐position on the central pyrimidine group of the ligand L. All Fe II ions in compounds with R 1 substituents favoring strong ligand fields (R 1 =H; OH) remain completely in the diamagnetic low‐spin state. Only complexes bearing R 1 substituents attenuating the ligand field by steric (and to a lesser extent electronic) effects (R 1 =Me; Ph) exhibit spin transition behavior triggered by temperature. In general, gradual and incomplete transitions without hysteresis were observed for magnetically active complexes. The systems described provide approaches to the development of (supra)molecular spintronics.