The
Malaysian Journal of Analytical Sciences Vol 10 No 2 (2006): 285 – 294
SYNTHESIS AND CHARACTERIZATION OF TRIBUTYLTIN(IV)
COMPLEXES DERIVED FROM PYRIDINE MONOCARBOXYLIC ACIDS
Yip Foo Win1, Teoh Siang Guan1*
and Bohari M. Yamin2
1School of Chemical Sciences, Universiti Sains
Malaysia,
11800 Minden
Penang, Pulau Pinang, Malaysia.
2School of Chemical Sciences and Food Technology,
Faculty of Science and Technology,
Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia.
Abstract
The
complexes of tributyltin(IV) with 2-pyridinecarboxylic acid, 2PycH;
3-pyridinecarboxylic acid, 3PycH; 4-pyridinecarboxylic acid, 4PycH and
5-bromo-3-pyridinecarboxylic acid, 5B3PycH (containing –COOH group and aromatic
{N} donor atom) were successfully synthesized. The complexes were prepared by
condensation of bis{tributyltin(IV)} oxide, (Bu3Sn)2O with the
respective free acids utilising the Dean and Stark apparatus
to remove water.
The free ligands
and complexes obtained
were characterized quantitatively
using C, H, N and Sn elemental analysis as well as spectroscopic methods such
as infrared (FTIR) and nuclear magnetic resonance (1H, 13C
& 119Sn NMR). Analysis of the free ligands and the
complexes showed that
the coordination took place via
oxygen atoms of the carboxylate
group. The carboxylate anions acted as monodentate or bidentate ligands. In
some of these complexes, the carboxylate groups form bridges between two
central tin atoms leading to the formation of polymeric structure. An X- ray investigation on the tributyltin(IV)-2PycH complexprovides
further evidence of the polymeric structure of the complex with trigonal
bipyrimidal geometry of the tin atom as predicted by the solid state 119Sn
NMR .
Keywords: Tributyltin(IV)
carboxylate; Polymer, X-ray, prridine
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