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Linear Chain Ferromagnetic Charge Transfer Compounds
Author(s) -
Miller Joel S.,
Epstein Arthur J.,
Reiff William M.
Publication year - 1986
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198600055
Subject(s) - chemistry , ferromagnetism , zeeman effect , paramagnetism , condensed matter physics , acceptor , charge (physics) , mössbauer spectroscopy , metamagnetism , spin (aerodynamics) , salt (chemistry) , crystallography , magnetic field , magnetization , thermodynamics , physics , quantum mechanics
Charge transfer complexes possessing a … DADA … structure with both the donor, D, and acceptor, A, being S = 1/2 radicals may exhibit cooperative magnetic phenomena. The complex [Fe(C 5 Me 5 ) 2 ] + ·[TCNQ] − · exhibits metamagnetic behavior. The similarly structured [TCNE] − · and [C 4 (CN) 6 ] − · complexes are ferromagnets, whereas the [DDQ] − · salt is a paramagnet. The high temperature magnetic susceptibility obeys the Curie‐Weiss expression with θ = + 30, + 30, and + 3 for the [TCNE] − ·, [C 4 (CN) 6 ] − ·, and [TCNQ] − · salts, respectively. The ferromagnetic [TCNE] − · salt exhibits zero field Zeeman split 57 Fe Mossbauer spectra with an internal field of 425.6 kOe at 4.23 K. After reviewing the current papers discussing ferromagnetism in molecular (organic) compounds, a qualitative model consistent with the necessary bulk spin alignment required for a ferromagnet is presented.