Synthesis, Crystal Structure and Properties of a Coordination Compound: Ni(C6H12N4)2SO4•4H2O

A new coordination compound, Ni(C6H12N4)(2)SO4 center dot 4H(2)O(NSH-HMTA) (HMTA, hexamethylenetetramine, C6H12N4), has been synthesized and its single crystals were obtained. NSH-HMTA belongs to the triclinic system, space group P (1) over bar with a = 9.2534(6), b = 13.3131(2), c = 16.0373(2) angstrom, alpha = 65.981(6), beta = 89.792(3), gamma = 89.677(4)degrees, M-r= 880.2, Z = 2, V = 1804.6(3) angstrom(3), mu = 1.254 mm(-1), F(000) = 932, R = 0.0555 (I > 2 sigma(I)) and wR = 0.1908 for 19343 observed reflections. HMTA substitutes for water molecules are located at the para-positions, forming a stretching octahedral nickel ion unit. Thermo-gravimetric analysis shows that the dehydration temperature of NSH-HMTA is about 92 degrees C. The characteristic UV peaks are approximately 10 nm red-shifted by the absorption of octahedral HMTA complex ion units.