New complexes of acetone isonicotinoylhydrazone (AIH) with uranyl sulphate, oxalate, and chloride of the types UO2(AIH)X2and UO2(AIH)2X2(X = 1/2SO/, 1/2C2O4#x2013;and Cl#x2212;) have been isolated and characterized by analytical data, molar conductance and infrared and Raman spectral data. In UO2(AIH)X2complexes, the ligand molecule acts as a neutral, tridentate ligand coordinated to one uranium atom through the carbonyl oxygen and the azomethine nitrogen and to a second uranium atom through the pydine nitrogen. In UO2(AIH)2X2complexes, one ligand molecule acts as a tridentate as above while the other coordinates as a monodentate ligand bonded only through the pyridinates nitrogen. Sulphate and oxalate ions act as bidentate, chelating ligands and chloride acts as a terminal ligand. The complexes are considered to have polimeric structher involving aseven and eight coordinated uranium atom in 1:1 and 1:2 uranyl-AIH complexes, respectively.
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