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

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 o...

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Bibliographic Details
Main Author: Amarante, Tatiana R. (author)
Other Authors: Gomes, Ana C. (author), Neves, Patricia (author), Almeida Paz, Filipe A. (author), Valente, Anabela A. (author), Pillinger, Martyn (author), Goncalves, Isabel S. (author)
Format: article
Language:eng
Published: 1000
Subjects:
BOND-VALENCE PARAMETERS
CYCLOOCTENE EPOXIDATION
CRYSTAL-STRUCTURES
DATABASE
CORE
DIOXO
Online Access:http://hdl.handle.net/10773/20026
Country:Portugal
Oai:oai:ria.ua.pt:10773/20026
Description
Summary: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.

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