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X‐ray Structure, Magnetic and Catalytic Properties of a Cyclic Trinuclear Co II /Co III /Co III Complex with a μ 3 ‐Hydroxy Anion
Author(s) -
Łukasiewicz Marta,
Ciunik Zbigniew,
Mazurek Jarosław,
Sobczak Jarosław,
Staroń Aldona,
Wołowiec Stanisław,
Zio´łkowski Józef J.
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(200106)2001:6<1575::aid-ejic1575>3.0.co;2-h
Subject(s) - chemistry , cobalt , hexacoordinate , catalysis , medicinal chemistry , chlorobenzene , electron paramagnetic resonance , cyclohexene , peroxide , crystallography , stereochemistry , inorganic chemistry , polymer chemistry , organic chemistry , physics , nuclear magnetic resonance , silicon
The mixed‐valent cyclic trinuclear cobalt(II)/cobalt(III)/cobalt(III) complex tris(dibenzoylmethanato‐1κ 2 O , O′ ;2κ 2 O , O′ ;3κ 2 O , O′ )(μ 3 ‐hydroxo‐1:2κ 2 O ;1:3κ 2 O ;2:3κ 2 O )tetrakis(μ‐pyrazolato‐1:2κ 4 N 1 N 2 ;1:3κ 2 N 1 N 2 ;2:3κ 2 N 1 N 2 )‐1,2‐dicobalt(III)‐3‐cobalt(II) with four bridging pyrazolate anions and a μ 3 ‐hydroxy anion has been synthesized and its molecular structure has been elucidated on the basis of X‐ray crystallographic, magnetic, NMR, and EPR studies. The remaining coordination sites of the pentacoordinate cobalt(II) and hexacoordinate cobalt(III) centers are occupied by oxygen donor atoms of dibenzoylmethanate anions, rendering the complex soluble in most organic solvents. The complex has been found to effectively catalyze the decomposition of tert ‐butyl hydroperoxide (TBHP) in chlorobenzene with a short induction period and a half‐life of 80 min and to catalyze the oxidation of cyclohexene to 2‐cyclohexen‐1‐one with oxygen and to 2‐cyclohexen‐1‐ol with TBHP.