The pale green powder of nickel L-threonate Ni（C4H7O5）2·2H2O was prepared from excess nickelous dihydroxycarbonate and L-threonic acid obtained by double decomposition reaction of calcium L-threonate with oxali...The pale green powder of nickel L-threonate Ni（C4H7O5）2·2H2O was prepared from excess nickelous dihydroxycarbonate and L-threonic acid obtained by double decomposition reaction of calcium L-threonate with oxalic acid at 80 ℃ for 2 h. The IR spectra indicated that Ni 2+ was in coordination with oxygen atom of the carboxyl group of L-threonic acid with coordination number of 4. The TG-DTG results showed the compound discomposes into NiO at 380 ℃ in nitrogen atmosphere. The constant volume combustion energy of the compound, ΔcE, determined by a precise rotating-bomb combustion calorimeter at 298.15 K, was （-3 515.22±1.97） kJ/mol. The standard enthalpy of combustion, ΔcH0m, and standard enthalpy of formation, ΔfH0m, were calculated to be -3 512.74±1.97 kJ/mol and -2 447.51±2.26 kJ/mol, respectively.展开更多
文摘The pale green powder of nickel L-threonate Ni（C4H7O5）2·2H2O was prepared from excess nickelous dihydroxycarbonate and L-threonic acid obtained by double decomposition reaction of calcium L-threonate with oxalic acid at 80 ℃ for 2 h. The IR spectra indicated that Ni 2+ was in coordination with oxygen atom of the carboxyl group of L-threonic acid with coordination number of 4. The TG-DTG results showed the compound discomposes into NiO at 380 ℃ in nitrogen atmosphere. The constant volume combustion energy of the compound, ΔcE, determined by a precise rotating-bomb combustion calorimeter at 298.15 K, was （-3 515.22±1.97） kJ/mol. The standard enthalpy of combustion, ΔcH0m, and standard enthalpy of formation, ΔfH0m, were calculated to be -3 512.74±1.97 kJ/mol and -2 447.51±2.26 kJ/mol, respectively.
