Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1238145 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2008 | 8 Pages |
Abstract
Some new diorganotin(IV) derivatives of the formulae, R2SnL, where RÂ =Â Me, n-Bu, Ph, and n-Oct, and L is the dianion of histidinylalanine (H2L-1) and histidinylleucine (H2L-2) have been synthesized by the reaction of R2SnCl2 and the preformed sodium salt of the respective dipeptides. The bonding and coordination behaviour in these derivatives are discussed on the basis of FT-IR, multinuclear 1H, 13C and 119Sn NMR and 119Sn Mössbauer spectroscopic studies. These investigations suggest that dipeptides in R2SnL act as dianionic tridentate coordinating through the COOâ, NH2 and Nâpeptide groups. The 119Sn Mössbauer studies, together with the NMR data, suggest a trigonal bipyramidal geometry around tin in R2SnL with the alkyl/aryl groups and Npeptide in the equatorial positions, while a carboxylic oxygen and the amino nitrogen atom occupy the axial positions.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Mala Nath, Hitendra Singh, George Eng, Xueqing Song,