Extraction and coordination studies of carbamoyl methyl sulfoxide (CMSO) with uranyl bis(β-diketonates). synthesis and molecular structure of [{UO2 (DBM)2}2C6H5CH2SOCH2CONHC6H5]

Abstract The carbamoyl methyl sulfoxide compounds of uranyl bis(β-diketonate) of the types [UO 2 (DBM) 2 CMSO] and [{UO 2 (DBM) 2 } 2 CMSO] (where HDBM = C 6 H 5 COCH 2 COC 6 H 5 ; CMSO = C 6 H 5 CH 2 SOCH 2 CONHC 6 H 5 or C 6 H 5 SOCH 2 CON i Pr 2 ) have been synthesized and characterized by IR and NMR spectroscopic techniques and elemental analysis. Spectral studies show that CMSO acts as a monodentate ligand in [UO 2 (DBM) 2 CMSO] compounds and bonds through the sulfoxo oxygen atom to the uranyl group. It acts as a bridging bidentate ligand in [{UO 2 (DBM) 2 } 2 CMSO] compounds and bonds through both the sulfoxo and carbamoyl oxygen atoms to two different uranyl groups. The structure of the compound [{UO 2 (DBM) 2 } 2 C 6 H 5 CH 2 SOCH 2 CONHC 6 H 5 ] confirms the bridging bidentate mode of coordination for the CMSO ligand. Extraction studies show an enhancement in solvent extraction for the uranyl ion from nitric acid medium when a mixture of thenoyl trifluoroacetone (HTTA) and CMSO was employed.