Structural characterization and catalytic activities of copper complexes with pyridine-amine-phosphine-oxide ligand
Resource
Journal of Organometallic Chemistry 690 (2): 415-421
Journal
Journal of Organometallic Chemistry
Journal Volume
690
Journal Issue
2
Pages
415-421
Date Issued
2005
Author(s)
Abstract
A new tetradentate containing pyridine, amine and phosphine oxide donor systems (1) was synthesized by the condensation of o-diphenylphosphinoaniline with 2-pyridinecarbaldehyde. Reaction of 1 with equal molar amount of CuCl 2 and Cu(ClO 4) 2 provided the formation of [CuCl 2(1)] (4) and [[Cu(1)(H 2O)](ClO 4) 2] (5), respectively. The ligand 1 behaves as a tridentate in 4, while as a tetradentate in 5. Both complexes were characterized by EPR, UV-Vis spectroscopy and X-ray diffraction. Both copper(II) complexes are in a square-pyramidal geometry. Single crystal structure of the copper complex reveals that the copper center is surrounded by three nitrogen donors and two chloride for 4; three nitrogen donors, water and oxygen donor from the moiety of phosphine oxide for 5. Complexation of 1 with CuCl in dichloromethane resulted in the formation of the corresponding copper(I) species, which catalyzed the oxidation of benzylic alcohols under aerobic conditions. © 2004 Elsevier B.V. All rights reserved.
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journal article
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