Synthesis, Spectral and Thermal Properties of MixedLigand Complexes of Uranyl (VI) Sulfate

The reaction of uranyl(vi) sulfate with 15 semicarbazones derived from 4-amino antipyrine in the presence of tetramethylene sulfoxide (tmso) resulted the complexes of the general composition [u02s04(l)*tms0], where l = 4[n-(benzalidene) amino]antipyrine semicarbazone (baaps); 4 [n-(2' -hy droxybenzalidene)amino] antipyrine semicarbazone (hbaaps); 4[n-(4'-methoxy benzalidene)amino]antipyrine semicarbazone (mbaaps); 4[n-(2'-nitrobenzalidene)amino] antipyrine semicarbazone (2'-n02baaps); 4 [n-(3' -nitrobenzalidene)amino]antipyrine semicarbazone (3'- n02baaps); 4[n-(4'-nitrobenzalidene)amino]antipyrine semicarbazone (4'- n02baaps); 4[n-(4'-dimethylaminobenzalidene)amino]antipyrine semicarbazone (dabaaps); 4[n-(4'-hydroxy-3'-methoxybenzalidene)amino]antipyrine semicarbazone (hmbaaps); 4 [n-(2' -hydroxy-1' -naphthalidene)amino] antipyrine semicarbazone (hnaaps); 4 [n-(cinnamalidene) amino] antipyrine semicarbazone (caaps); 4[n- (3' ,4' ,5' -trimethoxybenzalidene)amino]antipyrine semicarbazone (tmb aaps); 4[n- (furfural)amino]antipyrine semicarbazone (ffaaps); 4[n-(49-ethylbenzalidene)amino] antipyrine semicarbazone (ebaaps); 4[n-(2,,4'-dimethylbenzalidene)amino]antipyrine semicarbazone (dmb aaps); 4 [n-(2' ?45 -dichlorobenzalidene)amino]antipyrine semicarbazone (dcbaaps). all these complexes were characterized by means of elemental analysis, conductivity measurements, molecular weight, magnetic moments and infrared studies. the coordination number 8 is proposed for the complexes* thermal properties of the representative complexes are also reported.