SYNTHESIS AND CHARACTERIZATION OF DIORGANOSELENIUM (IV) AND ORGANOTELLURIUM (IV) DERIVATIVES CONTAINING SE-S-BOND OR TE-S-BOND

Diorganoselenium (IV) derivatives containing Se-S bonds, diphenyl selenium (IV) bis-(O,O'-diaikyldithiophosphates) [Ph2S')2]] [R’ = C2-H5, CHMe2 and CH2CHMe2], diphenyl selenium (IV) bis-(O,O'-alkeylene dithiophos-phates) [Ph2Se(S2PQR”O)2] [R” = -CH2C(Me)CH, -CH(Me)CH2C(Me2) - ] and organotellurium derivatives containing Te-S bonds, Organotellurium (IV) tris-(O,O'- dialkyl dithiophosphates) [Ph Te{S2')2}3] [R'= CHMe2], Organotellurium (IV) tris-(O,O'- alkylene dithiophosphates) [RTe(S2POR”O)3] [R = Ph or p - MeO6H4 and R” = -CH2CMe2CH2 - ] have been prepared and characterised on the basis of physicochemical and spectral (IR, ’H and 31P NMR) studies. The results indicate a pseudo trigonal bipyramidal geometry around selenium atom where the four position are occupied by the two phenyl and two dithiophosphate ligands while remaining one vacant position is occupied by lone pair of electrons. © 1990, Taylor & Francis Group, LLC. All rights reserved.