Four solid ternary complexes of RE （C5H8NS2）3(C12H8N2) （RE=Eu, Gd, Tb, Dy） were synthesized in absolute ethanol by rare earth chloride low hydrate with the mixed ligands of ammonium pyrrolidinedi-thiocarbamate （APDC） and 1, 10-phenanthroline·H2O （o-phen·H2O） in the ordinary laboratory atmosphere without any cautions against moisture or air sensitivity. IR spectra of the complexes show that the RE3+ coordinated with six sulfur atoms of three PDC- and two nitrogen atoms of o-phen·H2O. It was assumed that the coordination number of RE3+ is eight. The constant-volume combustion energies of the complexes, ΔcU, were determined as （-16937 88±9 79 ）, （-17588 79±8 62 ）, （（-17747 14±）8 25 ） and （-17840 37±8 87 ） kJ·mol-1, by a precise rotating-bomb calorimeter at 298.15 K. Its standard molar enthalpies of combustion, ΔcHθm, and standard molar enthalpies of formation, ΔfHθm, were calculated as （-16953 37±9 79）, （-17604 28±8 62）, （-17762 63±8 25）, （-17855 86±8 87） kJ·mol-1 and （-857.04±10.52）, （-282.43±9.58）, （-130.08±9.13）, （-55.75±9.83） kJ·mol-1.
展开▼
