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Synthesis, crystal structure, magnetic study and magneto-structural correlation of three Cu(ii) complexes formed via pyridine bis(hydrazone) based ligand

Author:
Adhikary, Amit, Sheikh, Javeed Ahmad, Konar, Anita Dutt, Konar, Sanjit
Source:
RSC advances 2014 v.4 no.24 pp. 12408-12414
ISSN:
2046-2069
Subject:
X-ray diffraction, copper, crystal structure, ferrimagnetic materials, ferromagnetism, hydrazones, ligands, magnetic properties, methanol, perchlorates, pyridines, temperature
Abstract:
This report describes the synthesis and characterization of three different complexes of molecular formulae {[Cu₆L₂(ClO₄)₄(μ-ClO₄)₂(H₂O)₉](ClO₄)₂·8H₂O}ₙ(1), [Cu₆L₂Cl₆(μ₂-Cl)₂(H₂O)₂]·3H₂O (2) and [Cu₉L₆](ClO₄)₆·6H₂O·2CH₃CN·CH₃OH (3), where, H₂L = bis[(2-pyridyl)methylene] pyridine 2,6 dicarbohydrazone. X-ray crystallography reveals that complex 1 exhibits 1D chain, complex 2 is a hexanuclear entity and an unsymmetrical [3 × 3] grid formation in complex 3. Variable temperature magnetic measurements were performed, they show that weak antiferromagnetic interactions exist among the metal centers in complex 1 and both ferro- and antiferromagnetic interactions coexist for complexes 2 and 3. Below 20 K antiferromagnetic interactions dominate for complex 2 whereas it is ferromagnetic for complex 3. Transformation from one cage to another is possible at mild reaction conditions, which results in a dramatic change in the magnetic properties.
Agid:
6647558