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11. Thermal, UV and FTIR Spectroscopic Studies in Urea-Thiourea
Mixed Crystal
G. Madhurambal1,
M. Mariappan2
1
Dean of Science, Reader & HoD of Chemistry, A D M College for Women,
Nagapattinam– 611 001, Tamil Nadu, India
2 Sr. Lecturer in Chemistry, E.G.S.P. Engg. College,
Nagapattinam – 611 002, Tamil Nadu, India
Email :
madhumaniam@yahoo.com
ABSTRACT
A mixed crystal of urea
thiourea was grown by slow evaporation of aqueous solution at room
temperature. The bright and transparent crystals obtained was
characterized through thermogravimetric (TG-DTA), UV and FTIR
spectroscopic analyses. A fitting decomposition pattern for the
title compound was formulated on the TG thermogram which shows a two
stage weight loss between 200°C and 750°C. In this temperature
range DTA curve shows exothermic dips supporting the formulated
decomposition pattern. The UV and FTIR spectra show the
characteristic absorption, vibration frequencies due to
urea-thiourea mixed crystals. Detailed structural analysis of the
compound is under progress.
Keywords: Solution growth, urea-thiourea mixed crystal, TG-DTA, UV,
FTIR
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