Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)

	Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)
	Di, YY ; Tan, ZC ; Yu, HG ; Gao, SL ; Liu, Y ; Sun, LX
刊名	thermochimica acta
	2004-03-23
卷号	412 期号:1-2 页码:171-177
关键词	Zn(HiOSO(4)center dot H2O(s) adiabatic calorimetry isoperibol solution-reaction calorimetry standard molar enthalpy of formation UV/Vis spectroscopy
英文摘要	low-temperature heat capacities of the solid coordination compound zn(his)so4.h2o(s) were precisely measured by a precision automated adiabatic calorimeter over the temperature range between t = 78 and 373k. the initial dehydration temperature of the coordination compound was determined to be, t-d = 324.20 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,c-m) with the reduced temperatures, x (x = f(t)), by least square method. enthalpies of dissolution of the znso4 . 7h(2)o(s) + his(s) (delta(d)hm,1degrees) and the zn(his)so4 . h2o(s) (delta(d)h(m,2)degrees) in 100.00 ml of 2 mol l(-3) hcl(aq) at t = 298.15 k were determined to be, delta(d)h(m,1)degrees = -(13.129 +/- 0.013) kj mol(-1) and delta(d)h(m,2)degrees = -(11.271 +/- 0.012) kj mol(-1), by means of a homemade isoperibol solution-reaction calorimeter. the standard molar enthalpy of formation of the compound was determined as: delta(f)h(m)degrees (zn(his)so4 . h2o, s, 298.15 k) = - (1827.61 +/- 12.3 1) kj mol(-1) from the enthalpies of dissolution and other auxiliary thermodynamic data through a hess thermochemical cycle by using the homemade isoperibol calorimeter. furthermore, the reliability of the designed hess thermochemical cycle was verified by comparing between uv/vis spectra and the refractive indexes of solution a (from dissolution of the [znso4 . 7h(2)o(s) + his(s)] mixture in 2 mol l(-3) hydrochloric acid) and solution a' (from dissolution of the complex zn(his)so4 . h2o(s) in 2 mol l(-3) hydrochloric acid). (c) 2003 published by elsevier b.v.
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, analytical ; chemistry, physical
研究领域[WOS]	chemistry
关键词[WOS]	calorimeter
收录类别	SCI
语种	英语
WOS记录号	WOS:000220132200022
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/139358]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China 2.Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China 3.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Di, YY,Tan, ZC,Yu, HG,et al. Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)[J]. thermochimica acta,2004,412(1-2):171-177.
APA	Di, YY,Tan, ZC,Yu, HG,Gao, SL,Liu, Y,&Sun, LX.(2004).Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine).thermochimica acta,412(1-2),171-177.
MLA	Di, YY,et al."Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)".thermochimica acta 412.1-2(2004):171-177.