Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 99, Issue 5, Pages 1230-1237Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2005.02.022
Keywords
vanadium; copper; electrochemistry; hydrogen bonding
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A series of vanadyl(IV) salen (N,N'-bis(salicylidene)ethylenediaminato)-type complexes (1-4) bearing phenyl or 2-hydroxyphenyl moieties have been prepared and characterized by means of mass spectrometry, infra-red, electron paramagnetic resonance (EPR), UV/Vis spectroscopy, cyclovoltammetry and X-ray crystallography. Their structures have been compared to their copper(II) analogs 5-8. Hydrogen intralinkages have been observed in the crystral structure of 5. The pendant hydroxy groups fine-tune the redox properties of the complexes. The catalytic activity in the oxygenation of ethyl phenyl sulfide to the corresponding sulfoxide was investigated. Results indicate that complex 1 bearing hydroxyphenyl subunits and a phenylene bridge is the most selective under these reaction conditions, with the smallest amount of the over-oxidized product, sulfone. (c) 2005 Elsevier Inc. All rights reserved.
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