Preparation and infrared spectrum of the novel isocyanato complex [Ni2(NCO)2(H2O)4]Cl2 formed by the reaction of urea with NiCl2

Synthesis and infrared spectra of alkaline earth metal carbonates formed by the reaction of metal salts with urea at high temperature

“…These studies show that the ability of alkaline earths to form complexes with urea at room temperature decreases significantly as the metal ionic radius increases (Arternova et al 1985). Our previous studies (Nour and Rady 1991;Teleb 1993;Teleb et al 1993;Nour et al 1997) on the nature of the reaction of urea with metal ions at high temperature show that the decomposition mode of coordinated urea is completely different from that of free urea and that the nature of the reaction products depend upon both the type of metal ions and associated counter ions. In order to continue our investigation in this area, the reaction of urea with Ca 2+ , Sr 2+ and Ba 2+ ions, in aqueous solutions at ~ 80°C, was studied.…”

Spectroscopic and Thermal Studies of [Cr2(NH2)2(H2O)2(SO4)2]·2H2O,[Cr(NCO)3(H2O)]·3H2O and [Fe O(OH)]·0.2H2O Compounds Formed by the Reactions of Urea with Cr2(SO4)3, Cr(CH3COO)3AND Fe2(SO4)3

“…However, detailed studies for this class of reaction at high temperature appear to be limited in the literature. [7][8][9][10][11][12] The nature of the reaction products was to be strongly dependent on the type of metal ion and the metal salt used in the reaction. To continue our investigation in this area, 7,10,12 we report in the present article the preparation of the related new compounds [Cr…”