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The treatment of RECl3·xH2O (RE = Ho, Er, Tm, Yb, Lu; x = 3-4) with sodium diethyldithiocarbamate RE(Et2dtc)3(phen). IR spectra of the complexes showed that RE3+ coordinated to two sulfur atoms in NaEt2dtc and two ritrogen atoms in o-phen. The constant-volume energies of combustion of the complexes have been determined by a precise rotating-bomb calorimeter at 298.15 K. The standard enthalpies of combustion and standard enthalpies of formation were calculated.