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The reactions of copper(I) halides with triphenylphosphine (PPh3) and mercaptan ligand [2-mercapto-6-nitrobenzothiazole (HMNBT), 2-amino-5-mercapto-1,3,4-thiadiazole (HAMTD) and 2-mercapto-5-methylbenzimidazole (MMBD)] yielded seven complexes, [CuCl(HMNBT)(PPh3)(2)] (1), [CuX(HMNBT)(PPh3)](2) (X = Cl, Br) (2-3), [Cu(MNBT)(HMNBT)(PPh3)(2)] (4), [CuBr(HAMTD)(PPh3)(2)]center dot CH3OH (5) and [CuX(MMBD)(PPh3)(2)]center dot 2CH(3)OH (X = Br, I) (6-7). These complexes were characterized by elemental analysis, X-ray diffraction, H-1 NMR and P-31 NMR spectroscopy. In these complexes the mercaptan ligands act as monodentate or bridged ligand with S as the coordination atom. In complexes 1 and 4, hydrogen bonds C-H center dot center dot center dot X and weak interactions C-H center dot center dot center dot pi lead to the formation of chains and 2D network respectively, while complexes 2 and 3 are dinuclear. In 5-7, intramolecular hydrogen bonds link the [CuX(thione)(PPh3)(2)] molecules and the solvated methanol molecules into centrosymmetric dimers. Complexes 1-5 represent first copper(I) halide complexes of HMNBT and HAMTD. The complexes 1, 5, 6 and 7 exhibit interesting fluorescence in the solid state at room temperature and their terahertz (THz) time-domain spectroscopy was also studied. (C) 2014 Elsevier B.V. All rights reserved.
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