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Dinuclear Cobalt(II) Complexes of an Acyclic Phenol‐Based Dinucleating Ligand with Four Methoxyethyl Chelating Arms − First Magnetic Analyses in an Axially Distorted Octahedral Field
Author(s) -
Sakiyama Hiroshi,
Ito Rie,
Kumagai Hitoshi,
Inoue Katsuya,
Sakamoto Masatomi,
Nishida Yuzo,
Yamasaki Mikio
Publication year - 2001
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 - 10.1002/1099-0682(200108)2001:8<2027::aid-ejic2027>3.0.co;2-z
Subject(s) - chemistry , cobalt , octahedron , ligand (biochemistry) , antiferromagnetism , chelation , ligand field theory , axial symmetry , crystallography , ion , phenol , stereochemistry , medicinal chemistry , inorganic chemistry , crystal structure , geometry , organic chemistry , condensed matter physics , receptor , physics , biochemistry , mathematics
An end‐off type acyclic ligand with four methoxyethyl chelating arms, 2,6‐bis[bis(2‐methoxyethyl)aminomethyl]‐4‐methylphenol [H(bomp)], formed dinuclear cobalt(II) complexes [Co 2 (bomp)(MeCO 2 ) 2 ]BPh 4 ( 1 ) and [Co 2 (bomp)(PhCO 2 ) 2 ]BPh 4 ( 2 ). X‐ray analysis revealed that complex 1· CHCl 3 contains two cobalt ions bridged by a phenolic oxygen and two acetate groups, forming a μ‐phenoxo‐bis(μ‐acetato)dicobalt(II) core. Magnetic susceptibility was measured for 1 and 2 over the temperature range 1.8−300 K. The data were successfully analyzed using a new theoretical method assuming an axially distorted octahedral field (Δ = 753 and 775 cm −1 , respectively) for each cobalt(II) ion to reveal weak antiferromagnetic interactions ( J = −0.96 and −1.74 cm −1 , respectively).