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  • 1 A. D. M. College for Women Nagapattinam 611 001 Tamil Nadu India
  • 2 E. G. S. P. Engg. College Nagapattinam 611 002 Tamil Nadu India
  • 3 University of Toronto Department of Chemical Engineering and Applied Chemistry 200 College Street Toronto ON M5S 3E5 Canada
  • 4 University of New Brunswick Department of Engineering Saint John NB E2L 4L5 Canada
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A mixed crystal of urea–thiourea was grown by slow evaporation of aqueous solution at room temperature. The bright and transparent crystals obtained were characterized by thermogravimetric–differential thermal analysis (TG–DTA), UV and FTIR spectroscopic analyses. A fitting decomposition pattern for the title compound was formulated on the TG curve which shows a two stage weight loss between 200 and 750 °C. In this temperature range DTA curve shows exothermic peaks 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.