A dinuclear oxo-bridged molybdenum(VI) complex containing a bidentate pyrazolylpyridine ligand: Structure, characterization and catalytic performance for olefin epoxidation

authors	Amarante, TR; Gomes, AC; Neves, P; Paz, FAA; Valente, AA; Pillinger, M; Goncalves, IS
nationality	International
journal	INORGANIC CHEMISTRY COMMUNICATIONS
author keywords	Molybdenum; Dinuclear complexes; Pyrazolylpyridine ligands; Olefin epoxidation
keywords	BOND-VALENCE PARAMETERS; CYCLOOCTENE EPOXIDATION; CRYSTAL-STRUCTURES; DATABASE; CORE; DIOXO
abstract	The oxo-bridged dinuclear complex [Mo2O4(mu(2)-O)Cl-2(pypzEA)(2)] (2) (pypzEA = ethyl[3-(pyridin-2-yl)-1H-pyrazol-1-yl]acetate) was obtained upon the treatment of [MoO2Cl2(pypzEA)] (1) with ethanol. The molecular structure of 2 consists of two highly distorted {MoClN2O3} octahedra sharing a corner oxygen atom, with a Mo - O -Mo "kink" angle of 163.2(2)degrees and a Mo center dot center dot center dot Mo separation of 3.7029(7) angstrom. Catalytic results with 2 for the epoxidation of cis-cyclooctene using tert-butylhydroperoxide as oxidant compare favorably with those reported for related oxomolybdenum(VI) complexes. The reaction is homogeneous in nature, and a fraction of 2 dissolves and is converted to other types of soluble active species, one of which was isolated and identified as the oxodiperoxo complex [MoO(O-2)(2)(pypzEA)] (3). (C) 2013 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	1387-7003
year published	2013
volume	32
beginning page	59
ending page	63
digital object identifier (doi)	10.1016/j.inoche.2013.03.028
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000320217700014