Preparation &Characterization of Diorganotin(IV) Compounds Containing Neutral Bidentate Nitrogen Donor Ligands

Abstract

Reactions of RR'SnCl₂ (R = Me, Et or Ph; R' = Me, Et or Ph) with neutral bidentate nitrogen donor ligands, <img src='http://www.niscair.res.in/jinfo/equation155.gif' border=0> [<img src='http://www.niscair.res.in/jinfo/equation155.gif' border=0> = bis(1-pyrazolyl)methane (pz₂CH₂), bis(3,5-dimethyl-l-pyrazolyl)methane [(Me₂pz)₂CH₂], 1-(2-pyridyl)pyrazole (pzpy) and 1-(2-pyridyl)-3,5-dimethylpyrazole (Me₂pzpy)], afford addition compounds of the type [RR'SnCl₂(<img src='http://www.niscair.res.in/jinfo/equation155.gif' border=0>)]. All the compounds have been characterised by elemental analyses, IR, NMR and ^119mSn Mossbauer spectral data. The observed values of isomer shift (<em>&delta;</em> &nbsp;&gt; 1.3mm/s) and quadrupole splitting (<img src='http://www.niscair.res.in/jinfo/delta.gif' border=0> Eq &gt; 3.5 mm/s) are interpreted in terms of <em>trans-</em>RR'Sn(IV) octahedral configuration. Variation of <em>&delta;</em> and <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0> Eq is discussed in terms of the coordination number and the nature of ligands (R, R' or <img src='http://www.niscair.res.in/jinfo/equation155.gif' border=0> ).