Resumo

GABALLA, A.S.; TELEB, S.M.  e  NOUR, E.M.. Preparation, Spectroscopic And Thermal Studies Of The Bridged Isocyanato Complex [Ni2(NCO)2(H2O)4]X2, (X= ½SO4 2− Or NO3− ). An. Asoc. Quím. Argent. [online]. 2005, vol.93, n.4-6, pp.233-239. ISSN 0365-0375.

The preparation of solid complexes [Ni2(NCO)2(H2O)4]SO4 and [Ni2(NCO)2(H2O)4]- (NO3)2 during the reaction of biuret with NiSO4 ×7H2O and Ni(NO3)2 ×6H2O, respectively, in aqueous solutions at elevated temperature are described. The reaction products are characterized through elemental analyses and infrared measurements. The IR spectra of the new complexes clearly indicate the absence of bands due to coordinated biuret, but instead show characteristic bands of bridged isocyanato ligands and coordinated water. TG and DTA thermograms of the complex [Ni2(NCO)2(H2O)4]SO4, as well as the IR spectrum of its final thermal decomposition product were recorded. The data obtained agree quite well with the expected structure. Detailed mechanisms for complex formation and their mode of thermal decomposition are given.

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