The solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under redu...The solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under reduced pressure. The composition of the complex is determined by chemical and elemental analyses and its formula fits Zn(C 4H 7O 5) 2. The purity of the complex is 99 60% by HPLC. The IR spectra indicate that Zn 2+ in the complex coordinates to oxygen atom of the carbonyl group and oxygen atom of the carboxyl group, while the proton of the carboxyl group is dissociated. It is assumed that the coordination number of Zn 2+ is 4. The TG DTG results show that the intermediate and final products of the thermal decomposition of the complex are Zn(CH 3COO) 2 and ZnO, respectively.展开更多
The pale blue powder of copper Lthreonac was obtained by extracting with alcohol in the concentrated solution derived from the reaction between Lthreonate acid solution prepared by double decomposition reaction of...The pale blue powder of copper Lthreonac was obtained by extracting with alcohol in the concentrated solution derived from the reaction between Lthreonate acid solution prepared by double decomposition reaction of calcium Lthreonate with oxalic acid and superfluous copper dihydrocarbonate at 80℃ and 30 min.The composition of the new compound was determined by chemical and elemental analyses and its formula fits Cu(C4H6O5)·05H2O.The IR spectra indicated that Cu2+ in the compound coordinates to oxygen atom of the carboxyl group pentaring and oxygen atom of hydroxy group of ethanol attached to carboxyl group forming,while the proton of the carboxyl group is dissociated.The results of TG-DTG show that the compound has fairish stability,the intermediate and final product of the thermal decomposition of the compound are Cu(C4H6O5) and CuO ,respectively.The constant volume combustion energy of the compound,ΔcE,it is (-16165±072)kJ·mol-1,was determined by a precise rotatingbomb calorimeter at 29815K,and its standard enthalpy of combustion,ΔcHθm,and standard enthalpy of formation,ΔfHθm,were calculated.They are(-161491±072)kJ·mol-1and (-111476±081)kJ·mol-1,respectively.展开更多
The dark blue powder of vanadyl L-theronate was obtained by extracting with alcohol in the Concentrated solution derived form the reaction between Calcium L-theronate solution with vanadyl oxalate soulution at 60℃ an...The dark blue powder of vanadyl L-theronate was obtained by extracting with alcohol in the Concentrated solution derived form the reaction between Calcium L-theronate solution with vanadyl oxalate soulution at 60℃ and 4h.The new compound Characterized as [VO（C4H6O5）]2·3H2O.展开更多
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 solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under reduced pressure. The composition of the complex is determined by chemical and elemental analyses and its formula fits Zn(C 4H 7O 5) 2. The purity of the complex is 99 60% by HPLC. The IR spectra indicate that Zn 2+ in the complex coordinates to oxygen atom of the carbonyl group and oxygen atom of the carboxyl group, while the proton of the carboxyl group is dissociated. It is assumed that the coordination number of Zn 2+ is 4. The TG DTG results show that the intermediate and final products of the thermal decomposition of the complex are Zn(CH 3COO) 2 and ZnO, respectively.
文摘The pale blue powder of copper Lthreonac was obtained by extracting with alcohol in the concentrated solution derived from the reaction between Lthreonate acid solution prepared by double decomposition reaction of calcium Lthreonate with oxalic acid and superfluous copper dihydrocarbonate at 80℃ and 30 min.The composition of the new compound was determined by chemical and elemental analyses and its formula fits Cu(C4H6O5)·05H2O.The IR spectra indicated that Cu2+ in the compound coordinates to oxygen atom of the carboxyl group pentaring and oxygen atom of hydroxy group of ethanol attached to carboxyl group forming,while the proton of the carboxyl group is dissociated.The results of TG-DTG show that the compound has fairish stability,the intermediate and final product of the thermal decomposition of the compound are Cu(C4H6O5) and CuO ,respectively.The constant volume combustion energy of the compound,ΔcE,it is (-16165±072)kJ·mol-1,was determined by a precise rotatingbomb calorimeter at 29815K,and its standard enthalpy of combustion,ΔcHθm,and standard enthalpy of formation,ΔfHθm,were calculated.They are(-161491±072)kJ·mol-1and (-111476±081)kJ·mol-1,respectively.
文摘The dark blue powder of vanadyl L-theronate was obtained by extracting with alcohol in the Concentrated solution derived form the reaction between Calcium L-theronate solution with vanadyl oxalate soulution at 60℃ and 4h.The new compound Characterized as [VO（C4H6O5）]2·3H2O.
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.
