{CuCl(dm4bt)} 2 -Cl) 2 ] (1) (dm4bt ¼ 2,2 0 -dimethyl-4,4 0 -bithiazole) was prepared from the reaction of CuCl 2 Á 2H 2 O with 2,2 0 -dimethyl-4,4 0 -bithiazole in methanol; [Cu(dm4bt) 2 NO 3 ](NO 3 ) (2) was prepared from the reaction of Cu(NO 3 ) 2 Á 3H 2 O with 2,2 0 -dimethyl-4,4 0 -bithiazole in methanol. Both complexes were characterized by IR, UV-Vis spectroscopy, and single-crystal structure. The structure of 1 consists of centrosymmetric dimeric [{CuCl(dm4bt)}(-Cl)], in which two chloro ligands bridge the coppers forming a fourmembered ring; a terminal chloride and a bidentate chelating bithiazole complete five coordination at each Cu(II) in a highly distorted trigonal-bipyramidal geometry. The mononuclear structure 2 consists of a Cu(II), two 2,2 0 -dimethyl-4,4 0 -bithiazoles, one monodentate nitrate and one uncoordinated nitrate in a highly distorted square pyramid.

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Copper complexes, [Cu(dm4bt)Cl 2 (DMSO)] (1) and [{Cu(dm4bt)(H 2 O)(tpht)} Á H 2 O] n (2) (dm4bt, 2,2 0 -dimethyl-4,4 0 -bithiazole; tpht, terephthalate), have been synthesized and their crystal structures were determined by X-ray crystallography. Complex 1 was prepared from a reaction of CuCl 2 Á 2H 2 O with dm4bt and terephthalic acid in a mixture of methanol, water, and DMSO. Complex 2 was prepared from a reaction of CuCl 2 Á 2H 2 O with dm4bt, terephthalic acid, and ethylene diamine in a mixture of methanol and water. The two complexes were characterized by IR, UV-Vis spectroscopy, and single-crystal structure. Complex 2 was also characterized by electron paramagnetic resonance spectra. Complex 1 is a monomer while 2 is a coordination polymer. This copper tpht polymer has a cis-configuration of tpht rings opposed to zigzag chains with anti-configuration usually reported in the literature.

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