Abstract
Abstract By using 2,2′-bipyridine N-oxide (bipyO) and 2,2′-bipyridine N,N′-dioxide (bipyO2), three new uranyl complexes [UO2(bipyO)SO4]·H2O (1), [UO2(bipyO)(OH)(NO3)]2·H2O (2) and [UO2(bipyO2)H2O](ClO4)2·(3) were synthesized using uranyl salts including non-coordinating or weakly coordinating power of the ClO4− anion and the strongly coordinating power of NO3− and SO42− anions. All of the compounds were characterized by CHN microanalytical procedures, infrared and luminescence spectroscopy and by single crystal X-ray diffraction. Spectroscopic studies indicate that the bipyO is bound to the uranyl group via the nitrogen and oxygen atoms. Structural analyses revealed that overall bonding pattern is different in each case: 1 is a polymer; in 2 dimeric complex molecules are formed, whereas 3 is composed of monomers. In all of the complexes, the uranium atom is in a seven-coordinate environment.
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