Hydration behaviour of some alkyl dithiocarbonates and their mixed-ligand oxalatochromate complexes
Abstract
A series of mixed-ligand chromate complexes, K2[Cr(ox)2(S2COR)]·xH2O (ox = oxalate, R = Me, Et, Prn, Pri, Bun, Bui, Bus or CH2Ph), has been isolated and characterized. From density and ultrasonic velocity measurements at 25, 35 and 45 °C of the potassium salts K[S2COR] of the alkyl dithiocabonates and their corresponding mixed-ligand chromate complexes in aqueous solution, partial molal volumes (V2°), partial molal adiabatic compressibilities (κs°) and hydration numbers (nH) have been determined. The hydration atmospheres around the second co-ordination sphere of the complexes in solution have been examined as a function of temperature. The results have been interpreted in terms of differences in hydration behaviour of the ligands and complexes, on the basis of known hydration models.