THE DIBENZYLIDENEACETONE ADDUCTS OF URANYL BIS(BETA-DIKETONATES) - THE LOW-TEMPERATURE NMR BEHAVIOR AND MOLECULAR-STRUCTURE OF [UO2(TTA)(2)CENTER-DOT-DBA]

Uranyl complexes of the type [UO2(OO)(2) . DBA] (OO = TTA, DBM and BA) have been prepared and characterized by H-1, F-19 and C-13{H-1} NMR, IR spectroscopic techniques and elemental analyses. The low temperatur e behaviour of the complex [UO, (TTA)(2) . DBA] was studied by the F-1 9 NMR technique and its structure solved by single-crystal X-ray diffr action. The structure determination shows that the uranium atom has pe ntagonal-bipyramidal geometry with the four oxygen atoms of TTA and on e oxygen atom of DBA lying on the basal plane and two uranyl oxygen at oms occupy the apices.