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Binuclear Copper(II) Complexes with Robsori ‐Type Ligands. Synthesis, characterization, crystal structure, and magnetic properties
Author(s) -
Cheng Peng,
Liao Daizheng,
Yan Shiping,
Cui Jianzhong,
Jiang Zonghui,
Wang Genglin,
Yao Xinkan,
Wang Honggen
Publication year - 1997
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19970800119
Subject(s) - chemistry , monoclinic crystal system , crystal structure , crystallography , copper , magnetic susceptibility , ligand (biochemistry) , ion , stereochemistry , bridging ligand , receptor , organic chemistry , biochemistry
Three binuclear copper(II) complexes, [Cu 2 (μ‐L)(μ‐N 3 )](ClO 4 )2′ 1‐5 EtOH (1), [Cu 2 (μ‐L)(μ‐MeO)(ClO 4 )]‐ClO 4 ‐ EtOH ( 2 ) and [Cu 2 (μ‐L)(μ‐C 3 H 3 N 2 )](ClO 4 ) 2 · 2H 2 O, ( 3 ) where L is the pentadentale bridging ligand derived from 5‐(tert‐butyl)‐2‐hydroxybenzene‐1, 3‐dicarbaldehyde bis(benzoylhydrazone) ( HL ) were synthesized and characterized. The crystal‐structure determination of complex 2 provided the following crystal data: monoclinic, space group P 2 1 }/ a, a = 11.412(2), b = 24.509(4), c = 14.833(4) Å, β = 104.41(2)°, K = 4018(3) Å 3 , Z = 4. The structure shows that the Cu II ions are bridged by the endogenous phenolato O‐atom and by an exogenous bridge CH 3 O − . The analysis of variable‐temperature magnetic susceptibility data (4‐300 K.) indicates that there is an antiferromagnetic interaction between the Cu II ions in these complexes with an exchange parameter ( 2J ) of −119.1 cm −1 for complex 1 and −361.8 cm −1 for complex 3 . The effect of some exogenous bridging ligands on magnetic coupling for this type of complex is suggested.