Osmium arylazoimidazoles: Synthesis, spectral characterisation and redox properties of the complexes View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-12

AUTHORS

Sanjib Pal, Tarun Kumar Misra, Pabitra Chattopadhyay, Chittaranjan Sinha

ABSTRACT

Arylazoimidazoles (RaaiH,p-R-C6H4N=N-C3H3N2, R=H, Me, OMe, Cl and NO2) are N,N′-chelators. On reaction with (NH4)2[OsCl6], two classes of isomers blue-violetctc-Os(RaaiH)2Cl2 and red-violetccc-Os(RaaiH)2Cl2 have been isolated. The complexes have been characterised by elemental analyses, IR, UV-Vis and1H NMR spectral data. The N=N stretching is red shifted by 70–80 cm−1 compared to the free ligand values and indicatesd(Os)→π*(azo) charge shifting. This is supported by MLCT transition in the visible region.1H NMR spectra suggest that blue-violet isomers areC2-symmetric and red-violet isomers areC1-symmetric. Redox studies show the Os(III)/(II) couple of both isomers at 0·6–0·7 Vvs SCE and two successive azo reductions. More... »

PAGES

687-696

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02871283

DOI

http://dx.doi.org/10.1007/bf02871283

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085996578


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