Analytical Sciences

Crystal Structure of Dissymmetrically Trihydrated N,N',N"-Tribenzoylmelamine (TBM)

Ichiro TAKAHASHI,*  Shigeki KAMIMURA,* Minoru HATANAKA,* Hidehiko KITAJIMA,* Akihito YAMANO,** Tomihisa OHTA,*** and Shinzo HOSOI,*** 

*Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Fukui University, 9-1 Bunkyo3-chome, Fukui 910-8507, Japan
**X-ray Research Laboratory, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan
***Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan

In the crystal structure of TBM-trihydrate three waters of crystallization were found to locate dissymmetrically. Thus, one of them forms a chelated ring with the neighboring C=O and N-H of TBM. Two other ones bind each other through hydrogen bonding and two sets of which form a cyclic dimer by hydrogen bonding (namely, water-tetramer). A C=O group binds by hydrogen bonding to each of the tetrameric water. The spatial volume occupied by water-teramer appears to be sufficient for complexation with organic molecules.

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