1968 Volume 41 Issue 12 Pages 2908-2913
From the thermogravimetric analysis, hexamminenickel(II) complexes were confirmed to decompose in two or three steps through lower ammine intermediates NiXm·nNH3: n=2, 1 and m=2 for X=Cl; n=2 and m=2 for X=I, Br; n=4 and m=2 for X=NO3 and n=2, 1/2 and m=1 for X=SO4. The diffuse reflectance spectra of these intermediates have been measured in a range between 5000 to 27000 cm−1, and they suggested that these intermediates may be polymers in which nickel ions were octahedrally coordinated with ammonia molecules and bridging halogen atoms. The infrared absorption spectra of these intermediates obtained in a range between 5000 and 60 cm−1 are also reported.
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