NDLI: Cobalt lawsone complexes: searching for new valence tautomers

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Silva, Marcos M. P. Pinheiro, Maurício V. B. Ribeiro, Marcos A. Lanznaster, Maurício Stumpf, Humberto O. Krambrock, Klaus Resende, Jackson A. L. C. Pinheiro, Carlos B.
Description	Author Affiliation: Ribeiro MA ( Departamento de Física, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, CEP 31270-901, Belo Horizonte, Brazil.)
Abstract	Bi-stable molecular systems presenting valence tautomerism are associated with the development of new functional materials, which can be used for applications in organic electric conductors, optoelectronic and molecular magnetic devices. The properties of these materials can be adjusted with slight chemical changes and can be induced by external stimuli. Typical examples of valence tautomer compounds are coordination complexes of Co and o-dioxolene ligands , notably quinone like ones. In the search for a new class of cobalt complexes presenting valence tautomerism we report herein the synthesis and characterization of five new coordination compounds of cobalt and 2-hydroxy-1,4-naphthoquinone ( lawsone or shortly Law). Complexes $[Co(Law)_{2}(im)_{2}]·C_{6}H_{5}CH_{3}$ (1), $[Co(Law)_{2}(py)_{2}]·CH_{3}OH$ (2), $[Co(Law)_{2}(phen)]·(C_{4}H_{8}O)_{2}$ (3), $[Co(Law)_{2}(2,2-bpy)]·C_{6}H_{5}CH_{3}$ (4) and $[Co(Law)_{2}(2,2-bpy)]$ (5) were synthesized and fully characterized by X-ray diffraction and EPR techniques in a wide range of temperatures and under illumination. Despite presenting similar molecular and geometry packing of the valence tautomer complexes of cobalt and o-dioxolenes, neither structural nor electronic evidence of valence tautomerism could be found in the Co and lawsone complexes.
ISSN	14779226
Issue Number	15
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-04-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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