Abstract
The thermochemical changes in the coordination structure of diaquabis( N-substituted ethylenediamine) nickel(II) complexes ([Ni(H 2O) 2(diamine) 2]X 2) were investigated by means of TG and DTA, and electronic spectroscopy, where diamine is N-methyl-( N-men), N-ethyl-( N-een), N-isopropyl-( N-ipen), N-phenyl-( N-phen), or N, N-di- n-butylethylenediamine( NN-dben), and X is Cl â or Br â. The diaqua complexes prepared were all trans. The trans complexes with N-mono-substituted ethylenediamines brought about a deaquation-anation on heating, retaining the original trans configurations. Only the complex chloride with NN-dben transformed into the cis-dichloro complex upon thermal dehydration. The mechanism of the trans-to-cis configurational change of the complex chloride with NN-dben was proposed, and the effects of N-substituent group(s) upon their thermal structural changes were discussed.
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