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Standard Molar Enthalpy of Formation of RE(C 5 H 8 NS 2 ) 3 ( o ‐phen)
Author(s) -
XiangXin Meng,
ShengLi Gao,
SanPing Chen,
XuWu Yang,
Gang Xie,
QiZhen Shi
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590562
Subject(s) - chemistry , standard enthalpy of formation , enthalpy , ternary operation , molar , nitrogen , standard enthalpy change of formation , heat of combustion , hydrate , chloride , nuclear chemistry , analytical chemistry (journal) , medicinal chemistry , combustion , organic chemistry , thermodynamics , medicine , physics , dentistry , computer science , programming language
Abstract Five solid ternary complexes of RE(C 5 H 8 NS 2 ) 3 ( o ‐phen) (RE=Ho, Er, Tm, Yb, Lu) have been synthesized in absolute ethanol by rare earth chloride low hydrate reacting with the mixed ligands of ammonium pyrrolidinedithiocarbamate (APDC) and 1,10‐phenanthroline·H 2 O ( o ‐phen·H 2 O) in the ordinary laboratory atmosphere without any cautions against moisture or air. IR spectra of the complexes showed that the RE 3+ coordinated with six sulfur atoms of three PDC ‐ and two nitrogen atoms of o ‐phen·H 2 O. It was assumed that the coordination number of RE 3+ was eight. The constant‐volume combustion energies of the complexes, Δ c U , were determined as (−16788.46±7.74), (−15434.53±8.28), (−15287.80±7.31), (−15200.50±7.22) and (−15254.34±6.61) kJ·mol ‐1 , respectively, by a precise rotating‐bomb calorimeter at 298.15 K. Its standard molar enthalpies of combustion, Δ c $ H^{\Theta}_{m} $ , and standard molar enthalpies of formation, Δ f $ H^{\Theta}_{m} $ , were calculated as (−16803.95±7.74), (−15450.02±8.28), (−15303.29±9.28), (−15215.99±7.22), (−15269.83±6.61) kJ·mol ‐1 and (−1115.42±8.94), (−2477.80±9.15), (−2619.95±10.44), (−2670.17±8.22), (−2650.06±8.49) kJ·mol ‐1 , respectively.