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|Title:||Isomeric mixed dioxolene 2-(arylazo)pyridine complexes of osmium(II): Synthesis, spectra and electrochemistry|
Mondal, Naba Kumar
Ghosh, Barindra Kumar
|Abstract:||The complexes blue-violet (3) and red-violet (4) isomers of [OsX2L2] [X = Cl or Br; L (2) = 2-(phenylazo)pyridine (L1 and 2-(m -tolylazo)pyridine (L2)] react smoothly with catechol and its substituted derivative [H2Q; (1)] in boiling aqueous ethanol affording mixed tris complexes of the type [OsQL2] [(5) and (6), respectively]. The new complexes have been characterized by physicochemical, spectroscopic and magnetic methods. From 1H NMR spectra (taking δMe of L2 as diagnostic probe), the stereoretentivity of the reactions is proposed. The diamagnetic complexes display a number of spinal lowed and spin-forbidden charge-transfer transitions in the 1200-200 nm range. Both (5) and (6) are electroactive and display six voltammetric responses - two oxidati ons and four reductions. EPR study of the coulometrically generated one electron oxidation product suggests the involvement of semiquinone radical formation.|
|Appears in Collections:||IJC-A Vol.41A(07) [July 2002]|
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