Source of materialTo an aqueous solution of CoBr2 (1.0 mmol), an ethanolic solution of hexamethylenetetramine was slowly added (2.0 mmol), the small ammount of the appreciate was dissolved by addition of few drops of dilute HBr solution. Pink block crystals were deposited after a few days. DiscussionHexamethylenetetramine (hmt) can acts not only as ligands in the preparation of the metal complexes [1-12] but also as a kind of host molecules in the formation of the inclusion compounds [13][14][15][16][17]. The reaction of CoX (X = halides or pesdohalides) with hmt were reported two decades ago, but few of the crystal structures of the products have been characterized [3]. We herein reported the synthesis and crystal structure of the title compound in which the hmt molecules act as the host molecules. The structure of the title inclusion compound contains guest [Co(H 2 0) 6 ] 2+ and Br" ions, host hmt molecules and lattice water molecules, as shown in figure. In the unit cell, the Co(II) atom, located on the 2-fold axis, is coordinated by six aqua ligands in a slightly
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