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Thermodynamic data base physical and chemical changes of matter is an important process parameters. In this paper, isophthalic acid (1,3-H2bdc) and the sodium salt of isophthalic acid derivatives for the study, three different calorimetry between measured and calculated a class derived from terephthalic acid and isophthalic acid sodium salt of the basic thermodynamic data . The main contents are as follows : ( 1 ) synthesized in deionized water five 5 - substituted isophthalic acid sodium salt (5-R-Na2bdc · nH2O, H2bdc = isophthalic aci d, R = H, NH2, OH, CH3, NO2, n = 0.5,1,1,1,1) powder , and its purity was characterized . Application RB-Ⅱ type rotating bomb calorimeter and RD496-2000 -type micro- calorimeter has been synthesized samples were measured combustion energy △ cU and standard molar enthalpy ΔsolHmθ. By designing rational combination Hess thermochemical cycle theorem to calculate the sample other basic thermodynamic functions , such as the standard molar enthalpy of formation, standard molar enthalpy of formation and other anions . ( 2 ) using micro- RD-496 2000 calorimeter were measured five kinds five substituents sodium isophthalate was dissolved in deionized water, the molar concentrations enthalpies ΦL, by solution chemistry and combined theoretical molar latent heat Pitzer model to calculate the five kinds of samples under 298.15K Pitzer parameters βMX (0) L, βMX (1) L, unlimited enthalpy ΔsolH ∞ m. And relative partial molar enthalpy of L1, L2. Through the system than the calculated results with the experimental results , exploring these thermodynamic data , Pitzer model parameters regularity , in order for this law to seek a basis for structural support . ( 3 ) have been synthesized and measured five five substituents sodium isophthalate (78K-400K) temperature within the temperature range molar heat capacity data, and through the corresponding mathematical statistical methods to calculate the temperature in the measurement region the thermodynamic functions .
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