Synthesis and characterization of diorganotin esters of heteroaromatic carboxylic acid and crystal structure of ⁿBU₂Sn(2-PyCO₂)₂.H₂O

Abstract

Reactions of ⁿBu₂SnO with 2-furanyl, 2-furanvingl, 2-thiophenyl, 2-pyridinyl, 3-pyridinyl, 4-pyridinyl, 3-indolyl, 3-indolmethyl and 3-indolpropyl carboxylic acids in 1:2 stoichiometry yield complexes of the type ⁿBu₂(O₂CR)₂. These complexes, on treatment with ⁿBu₂SnCl₂ afford the chloro complexes, ⁿBu₂Cl(O₂CR). All the complexes have been characterized by elemental analysis, IR and ¹H NMR spectral studies. The crystal structure of ⁿBu₂Sn(2-PyCO₂)₂.H₂O has been determined by single crystal X-ray diffraction. The crystal belongs to rhombohedral with space group <i>R-3c, a</i>=15.807(3)Å, <i>b</i>=15.807(3)Å,<i> c</i>=15.807(3) Å, <i>α</i>=105.717(2)^o,<i>β</i>=105.717(2)^o, γ<i>=</i>105.717(2)°, Z=6, <i>V</i>=3397(8)ų, <i>D</i>c<i>= </i>1.452g/cm³,

<i>μ</i>=1.158mm^-l , <i>F</i>(000)<i>=</i>1512<i>, R</i>₁<i>=</i>0.0447<i>, wR</i>₂<i>=</i>0.1038<i>. </i>In crystal, the tin atoms render seven-coordinate in a distorted pentagonal bipyramidal geometry. The two-dimensional network structure is formed by The H-bonding action between the free carboxyl groups and coordinated water molecule.