Structural and Coordination Features of a Hydrated Nickel-Bromide Complex with Hexamethylenetetramine
The complex compound NiBr2×2(CH2)6N4×10H2O was synthesized and structurally characterized using X-ray crystallography, thermogravimetric analysis, differential scanning calorimetry, and infrared spectroscopy. The complex crystallizes in a monoclinic system (P21/c) with an octahedral nickel coordination environment, where Ni-O bond lengths range from 2.027 to 2.058 Å. Thermal analysis confirmed stability up to 150°C, followed by dehydration, HMTA degradation at 200°C, and framework breakdown above 300°C.