Stereochemistry of some high coordination compounds of dioxouranium(VI) With thiosemicarbazones
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The UO2 ion is peculiar in its coordination behaviour, because of its inherent capacity of forming compounds with higher coordination number. In the present work we describe the synthesis of a series of eight, nine and ten coordinated compounds of dioxouranium(VI) with 4[N-(2'-nitrobenzalidene)- amino] antipyrinethiosemicarbazone (2'-NO2BAAPT) and 4[N-(3'-nitrobenzalidene) amino] antipyrinethiosemicarbazone (3'-NO2BAAPT) with the general composition UO2X2.nL (X = Br, I, NCS or CIO4, n=2; X = NO3 or CH3COO, n = 1; L = 2'-NO2BAAPT or 3'-NO2BAAPT). These compounds were synthesized in non-aqueous solvents, and were characterized by various physico-chemical techniques. The ligands behave as tridentate ^S-donors. Wilson's G-F matrix mehtod was used to determine the stretching and interaction force constants from which the U-O bond distances were calculated. Thermal stabilities of these complexes were also investigated.