Synthesis And Thermochemical Properties Of Complexes Of Succinic Acid With Live Metals

Succinic acid is also known as butane diacid, succinic acid is the most important rawmaterial for producing five yuan heterocyclic compounds. For example, succinic acidwill loss water rapidly and form succinic anhydride, when it is heated. And it is animportant raw material in manufacturing medicines and dyes. Besides, succinic acid is alsoused to produce paint, dye, food flavoring, vitamin A, vitamin B and other drugs. And aschemical reagent, succinic acid is also used as raw material of surface active agent,lubricant and buffer. This topic is mainly to use uccinic acid and life metal elements tosynthesize series of metal complexes and research their thermodynamics properties.Synthesis and characterization of succinateThis topic is mianly to synthesize seven succinate. X-ray single crystal diffraction,chemical analysis and thermal analysis techniques were used to determine the composition,crystal structure and space structure of the compounds.Research of thermodynamics properties1The heat capacities of the compounds were measured for using a precision automaticadiabatic calorimeter during the temperature range from78to400K, and the molarheat capacity curves were drawn relative to the temperature.2The least-squares method was used to fit the experimental heat capacities for thecompounds and one polynomial equation of heat capacities vs. temperature has beenobtained. The smoothed molar heat capacities and thermodynamic functions relative tothe standard reference temperature298.15K were calculated based on the fittedpolynomial equations.3According to Hess’s law, a thermochemical reaction was designed. Isoperibolsolution-reaction calorimeter and a suitable solvent were used to measure the enthalpies of solution of the reactants and products and calculate the enthalpy ofreaction. Then the standard molar enthalpies of formation of the compounds werecalculated according to the enthalpy of reaction and other known thermodynamic data.And the rationality of the designed reaction was verified.4The molar solution enthalpy of succinate in water at infinite dilution and Pitzer’sparameters were calculated on the basis of Pitzer’s electrolyte solution theory.