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Citation: Gao Sheng-Li, Yang Xu-Wu, Chen San-Ping, Ju Zhan-Feng. Synthesis and Standard Enthalpy of Formation of Magnesium L-Threonate[J]. Acta Physico-Chimica Sinica, ;2002, 18(11): 994-997. doi: 10.3866/PKU.WHXB20021107 shu

Synthesis and Standard Enthalpy of Formation of Magnesium L-Threonate

1.
Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry, Northwest University, Xi’an　710069

Received Date: 10 February 2002
Available Online: 15 November 2002

The white powder of magnesium L-threonate was obtained by extracting with alcohol the concentrated solution obtained from the reaction between L-threonic acid solution prepared by double decomposition reaction of calcium L-threonate with oxalic acid and superfluous magnesium oxide at 80 ℃. The composition of the new compound was determined by chemical and elemental analyses and its formula fits Mg(C4H7O5)2•H2O, the IR spectra indicated that Mg2＋ in the compound coordinates to oxygen atom of the carboxyl group, while the proton of the carboxyl group is dissociated, it was assumed that the coordination number of Mg2＋ was 4 . The results of TG－DTG showed that the compound had fairish stability, the intermediate and final product of the thermal decomposition of the compound are Mg(C4H7O5)2, Mg(CH3COO)2 and M , respectively. The constant volume combustion energy of the compound, ΔcE, was determined as (－10 407.34±4.67) kJ•mol－1 by a precise rotating-bomb calorimeter at 298.15 K, its standard enthalpies of combustion, ΔcHm, and standard enthalpies of formation, ΔfHm, were calculated as(－3 249.49±1.46) kJ•mol－1 and (－2 786.23±1.84) kJ•mol－1, respectively.
- Magnesium Lthreonate;Synthesis;Thermal analysis;Standard enthalpies of formation
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