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Fe II Complexes with Triple N 1, N 2‐Triazole Bridge Schiff Base Ligand: Antiferromagnetic Dimer vs. Spin Conversion Trimer
Author(s) -
Li AiMin,
Hochdörffer Tim,
Wolny Juliusz A.,
Schünemann Volker,
Rentschler Eva
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800784
Subject(s) - chemistry , crystallography , spin crossover , trimer , ligand (biochemistry) , 1,2,4 triazole , schiff base , dimer , triazole , antiferromagnetism , spin states , stereochemistry , inorganic chemistry , medicinal chemistry , organic chemistry , biochemistry , receptor , physics , condensed matter physics
Based on the p ‐tolyl functionalized Schiff base 1,2,4‐triazole ligand 4‐( p ‐tolylidene‐amino)‐4 H ‐1,2,4‐triazole (toltrz), a series of three triazole‐bridged Fe II complexes have been prepared. The compounds represent a range of dinuclear and trinuclear species, with µ 2 ‐ N1,N2 ‐triazole bridges linking the Fe II centers. Mössbauer spectroscopy and magnetic susceptibility measurements reveal a gradual single‐step spin crossover (SCO) behavior for the trimeric compound 3 on the central Fe II site. Single‐crystal X‐ray diffraction at 120 K confirms that the central Fe II site undergoes a HS to LS transition while the peripheral Fe II remain in HS state (HS = high spin; LS = low spin). Compounds 1 and 2 are isostructures with different terminal ligand XCN (X = S, Se), these two compounds stay in high spin state over the whole temperature range but display weak antiferromagnetic exchange coupling.