Thermal properties of dimethylgold(III) 8-hydroxyquinolinate and 8-mercaptoquinolinate

Dimethylgold(III) complexes with 8-hydroxyquinoline Me2Au(Ox) (I) and 8-mercaptoquinoline Me2Au(Tox) (II) were synthesized and studied. Complex II obtained for the first time was identified from the elemental analysis, IR, H-1 NMR, and mass spectrometry data. The thermal properties of complexes I, II in condensed state were investigated by thermography. The temperature dependences of the saturated vapor pressure over crystals were measured by the Knudsen effusion method with mass spectrometric recording of the gas phase composition and the thermodynamic characteristics of the sublimation process were determined: for I, log P[Torr] = (14.6 +/- 0.3) - ( 6.34 +/- 0.10) x 10(3)/(T, K), Delta H-sub1 degrees = 121.2 +/- 1.9 kJ(-1), Delta S-sub1 degrees = 224.1 +/- 4.6 J mol(-1) K-1 (the temperature interval under study 80-115 degrees C); for II, logP[Torr] = 13.3 +/- 0.2) - ( 6.30 +/- 0.09) x 10(3)/(T, K), Delta H-sub1 degrees = 120.5 +/- 1.7 kJmol(-1), Delta S-sub1 degrees = 199.3 +/- 3.0 J mol(-1) K-1 (86-145 degrees C).