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Dinuclear, Tetranuclear and Chain (Mn II , Co II ) Complexes of Multifunctional Hydrazone Ligands – Structural and Magnetic Studies
Author(s) -
Bettle Peter J.,
Dawe Louise N.,
Anwar Muhammad U.,
Thompson Laurence K.
Publication year - 2011
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.201100746
Subject(s) - chemistry , hydrazone , carboxylate , crystallography , antiferromagnetism , stereochemistry , polymer chemistry , physics , condensed matter physics
The coordination chemistry of a group of hydrazone‐based ligands, modified with carboxylate and heterocyclic terminal donor groups, with Mn II and Co II has been investigated. The multifunctional nature of the ligands allows coordinative flexibility based on the hydrazone core, which is well established to lead to spin‐coupled polymetallic assemblies through μ‐O hydrazone bridging. Examples of dinuclear, tetranuclear and chain complexes are reported with hydrazone, carboxylate and triazole bridging. Spin exchange through the μ‐O and μ‐N,N bridging connections leads to antiferromagnetic exchange in most cases, except for the central subunit in the Mn II 4 chain complex, where small (< 90°) bridge angles result in contributing ferromagnetic interactions.