The pink powder of manganese L-threonate was obtained by extracting with alcohol the concentrated solution derived from the reaction between L-threonic acid solution prepared by double decomposition reaction of calciu...The pink powder of manganese L-threonate was obtained by extracting with alcohol the concentrated solution derived from the reaction between L-threonic acid solution prepared by double decomposition reaction of calcium L-threonate with oxalic acid and superfluous manganese oxide at 80℃for c ertain time.The composition of the n ew compound was determined by chemical and elemental analyses and its formu la fits Mn (C 4 H 7 O 5 ) 2 ·H 2 O,the IR spectra indicated that Mn 2+ in the compound coordinates to oxygen atom of the carboxyl group,while th e proton of the carboxyl group is dissociated,i t was assumed that the coordination n umber of Mn 2+ was 4.The results of TG-DTG showed that the compound have fairish stability,the intermediate and final product of the thermal de-composition of the compound are Mn (C 4 H 7 O 5 ) 2 and MnO 2 ,respectively.The constant volume combustion energy of the compound,Δ c E,were determined by a precise rotating-bomb calorimeter at 298.15K,it was(-3384.30±1.21)kJ·mol -1 ,its standard enthalpy of Combustio n,Δ c H m ,and standard enthalpy of formation,Δ f H m ,were calculated.They are(-3383.07±1.21)kJ·mol -1 and(-2571.68±1.63)kJ·mol -1 ,respectively.展开更多
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 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
A novel redox-active bipyridinium ligand N-（3-carboxyphenyl）-4,4＇-bipyridinium chloride （HCPBPyC1） and its coordination polymer {[Cd2（CPBPy）2（BDC）（H2O）2Cl2]·6H2O}n 1 （H2BDC = benzene-1,4-dicarboxylic ...A novel redox-active bipyridinium ligand N-（3-carboxyphenyl）-4,4＇-bipyridinium chloride （HCPBPyC1） and its coordination polymer {[Cd2（CPBPy）2（BDC）（H2O）2Cl2]·6H2O}n 1 （H2BDC = benzene-1,4-dicarboxylic acid） were synthesized and characterized. Crystallographic data for 1： C42H44Cd2Cl2N4O16, Mr = 1156.51, monoclinic, space group C2/c, a = 21.046（3）, b = 11.0036（15）, c = 20.012（3）A, β = 98.694（8）°, Z = 4, V = 4581.1（11）A3, Dc = 1.677 g/cm^3, F（000） = 2280 and μ = 1.120 mm^-1. Complex 1 possesses a thick and undulated two-dimensional layer with （6,3） topology, which interpenetrates with two others （above and below） to extend into a three-dimensional supramolecular framework.展开更多
文摘The pink powder of manganese L-threonate was obtained by extracting with alcohol the concentrated solution derived from the reaction between L-threonic acid solution prepared by double decomposition reaction of calcium L-threonate with oxalic acid and superfluous manganese oxide at 80℃for c ertain time.The composition of the n ew compound was determined by chemical and elemental analyses and its formu la fits Mn (C 4 H 7 O 5 ) 2 ·H 2 O,the IR spectra indicated that Mn 2+ in the compound coordinates to oxygen atom of the carboxyl group,while th e proton of the carboxyl group is dissociated,i t was assumed that the coordination n umber of Mn 2+ was 4.The results of TG-DTG showed that the compound have fairish stability,the intermediate and final product of the thermal de-composition of the compound are Mn (C 4 H 7 O 5 ) 2 and MnO 2 ,respectively.The constant volume combustion energy of the compound,Δ c E,were determined by a precise rotating-bomb calorimeter at 298.15K,it was(-3384.30±1.21)kJ·mol -1 ,its standard enthalpy of Combustio n,Δ c H m ,and standard enthalpy of formation,Δ f H m ,were calculated.They are(-3383.07±1.21)kJ·mol -1 and(-2571.68±1.63)kJ·mol -1 ,respectively.
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 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.
基金the National Natural Science Foundation of China (No. 20671090/5037206)the Key Project from CAS (No. KJCX2. YW.H01)
文摘A novel redox-active bipyridinium ligand N-（3-carboxyphenyl）-4,4＇-bipyridinium chloride （HCPBPyC1） and its coordination polymer {[Cd2（CPBPy）2（BDC）（H2O）2Cl2]·6H2O}n 1 （H2BDC = benzene-1,4-dicarboxylic acid） were synthesized and characterized. Crystallographic data for 1： C42H44Cd2Cl2N4O16, Mr = 1156.51, monoclinic, space group C2/c, a = 21.046（3）, b = 11.0036（15）, c = 20.012（3）A, β = 98.694（8）°, Z = 4, V = 4581.1（11）A3, Dc = 1.677 g/cm^3, F（000） = 2280 and μ = 1.120 mm^-1. Complex 1 possesses a thick and undulated two-dimensional layer with （6,3） topology, which interpenetrates with two others （above and below） to extend into a three-dimensional supramolecular framework.
