화학공학소재연구정보센터
Thermochimica Acta, Vol.258, 161-173, 1995
Thermal-Decomposition Reactions of Nickel(II) Complexes Under Quasi-Equilibrium Conditions .6. Thermochemical Investigation of Nickel(II)-Nicotinamide-Solvent Interactions in Solid Halogeno and Thiocyanato Complexes
Stoichiometries of thermal decompositions have been studied for the following Ni(II) nicotinamide (NA) complexes : Ni(NA)(2)Cl-2 . 2H(2)O (I), Ni(NA)(3)Br-2 . 4H(2)O (II), Ni(NA)(4)I-2 . 4H(2)O (III) and Ni(NA)(4) (NCS)(2) . 2C(2)H(5)OH (IV). Heating the compounds first results in a release of solvent molecules and desolvated compounds I’-IV’ are formed. NA molecules are released in two steps for complexes I’, II’, and III’, and in one step for complex IV’. Magnetic and spectral properties, as well as thermochemical data (quasi-equilibrium decomposition temperatures, DSC data) indicate an octahedral monomeric structure for complexes III, IV, III’ and IV’, and a polymeric structure for complexes I,II,I’ and II’, with adsorbed (I) and crystal water (II, III) or ethanol (IV).