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Influence of Ligand Substitution Pattern on Structure in Cobalt(II) Complexes of Bulky N , N′ ‐Diarylformamidinate N ‐Oxides
Author(s) -
Cibian Mihaela,
LangisBarsetti Sophie,
De Mendonça Fernanda Gomes,
Touaibia Sammy,
Derossi Sofia,
Spasyuk Denis,
Hanan Garry S.
Publication year - 2015
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.201402895
Subject(s) - chemistry , isomerization , cobalt , steric effects , ligand (biochemistry) , crystallography , substitution (logic) , oxide , chelation , stereochemistry , tetrahedron , inorganic chemistry , organic chemistry , catalysis , biochemistry , receptor , computer science , programming language
Cobalt(II) complexes of bulky N , N′ ‐diarylformamidinate N ‐oxide ligands were synthesized and structurally characterized. The cobalt(II) bis(chelates) are square‐planar (low spin) in the solid state, according to XRD and magnetic measurements ( μ eff = 1.8 to 2.1 μ B ), but show square‐planar (low spin) to tetrahedral (high spin: μ eff = 3.5 to 4.7 μ B ) isomerization in solutions of noncoordinating solvents, as demonstrated by different spectroscopic techniques. The isomerization equilibrium is highly sensitive to the substitution pattern on the ligand due to a combination of steric and electronic influences.