Mavr. Da Silva et al., Thermochemical studies of two copper(II) complexes with N-benzoyl-N ',N '-dialkylurea derivatives, THERMOC ACT, 378(1-2), 2001, pp. 45-50
The standard (p(0) = 0.1 MPa) molar enthalpies of formation of crystalline
bis(N-benzoyl-N',N'-diethylureato)copper(II), Cu(BETU)(2), and bis(N-benzoy
l-N',N'-diisobutylureato)copper(II), Cu(BIBU)(2), were measured, at T = 298
.15 K, by solution-reaction isoperibol calorimetry, respectively, as -(833.
7 +/- 9.7) and -(1050.6 +/- 12.1) U mol(-1). The standard molar enthalpy of
sublimation, at T = 298.15 K, of Cu(BETU)(2) Was determined by a Knudsen e
ffusion technique as (180 +/- 37) kJ mol(-1). These values were used to der
ive the standard molar enthalpy of formation of Cu(BETU)(2) in gaseous phas
e, and to evaluate the mean metal-ligand dissociation enthalpy of the compl
ex relative to that of the ligand with hydrogen. (C) 2001 Elsevier Science
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