caa a22 4500 463193679 CHVBK 20180406164916.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10973-005-7431-z doi (NATIONALLICENCE)springer-10.1007/s10973-005-7431-z Low-temperatureheat capacities and standard molar enthalpy of formation of the complex [Elektronische Daten] Zn(Val)SO4·H2O( s ) (Val= L -α-valine) [Y. Di, Z. Tan, L. Li, S. Gao, L. Sun] Low-temperature heat capacities of a solid complex Zn(Val)SO4·H2O(s) were measured by a precision automated adiabatic calorimeter over the temperature range between 78 and 373 K. The initial dehydration temperature of the coordination compound was determined to be, T D=327.05 K, by analysis of the heat-capacity curve. The experimental values of molar heat capacities were fitted to a polynomial equation of heat capacities (C p,m) with the reduced temperatures (x), [x=f (T)], by least square method. The polynomial fitted values of the molar heat capacities and fundamental thermodynamic functions of the complex relative to the standard reference temperature 298.15 K were given with the interval of 5 K. Enthalpies of dissolution of the [ZnSO4·7H2O(s)+Val(s)] (Δsol H m,l 0) and the Zn(Val)SO4·H2O(s) (Δsol H m,2 0) in 100.00 mL of 2 mol dm-3 HCl(aq) at T=298.15 K were determined to be, Δsol H m,l 0=(94.588±0.025) kJ mol-1 and Δsol H m,2 0=-(46.118±0.055) kJ mol-1, by means of a homemade isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the compound was determined as: Δf H m 0 (Zn(Val)SO4·H2O(s), 298.15 K)=-(1850.97±1.92) kJ mol-1, from the enthalpies of dissolution and other auxiliary thermodynamic data through a Hess thermochemical cycle. Furthermore, the reliability of the Hess thermochemical cycle was verified by comparing UV/Vis spectra and the refractive indexes of solution A (from dissolution of the [ZnSO4·7H2O(s)+Val(s)] mixture in 2 mol dm-3 hydrochloric acid) and solution A' (from dissolution of the complex Zn(Val)SO4·H2O(s) in 2 mol dm-3 hydrochloric acid). Springer-Verlag, 2006 adiabatic calorimetry nationallicence isoperibol solution-reaction calorimetry nationallicence standard molar enthalpy of formation nationallicence UV/Vis spectroscopy nationallicence Zn(Val)SO4·H2O( s ) nationallicence Di Y. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut Tan Z. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut Li L. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut Gao S. Department of Chemistry, Northwest University, 710069, Xi'an, P.R. China aut Sun L. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, P.R. China aut Journal of Thermal Analysis and Calorimetry Springer Netherlands 87/2(2007-01-01), 545-551 1388-6150 87:2<545 2007 87 10973 https://doi.org/10.1007/s10973-005-7431-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-005-7431-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Di Y. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut NATIONALLICENCE 700 1- Tan Z. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut NATIONALLICENCE 700 1- Li L. College of Chemistry and Chemical Engineering, Liaocheng University, 252059, Liaocheng, P.R. China aut NATIONALLICENCE 700 1- Gao S. Department of Chemistry, Northwest University, 710069, Xi'an, P.R. China aut NATIONALLICENCE 700 1- Sun L. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, P.R. China aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Springer Netherlands 87/2(2007-01-01), 545-551 1388-6150 87:2<545 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer