Two new uranium(VI) complexes with isonicotinic acid (HINT) have been synthesized and characterized.[(UO 2 )(NO 3 ) 2 (HINT) 2 ] (1) has a monomeric structure constructed of a hexagonal bipyramidal uranyl centre, two nitrate anions and two monodentate HINT in trans-positions. [(UO 2 )(OH)(INT)] (2) has a twodimensional (2D) polymeric structure constructed of uranyl hydroxyl 1D pillars and m 3 -bridging INT anions; the first observation of INT in m 3 -bridging mode for U(VI) ion via U-N bonding. Thermal analysis confirmed both complexes lost coordinated INT ligands followed by further decomposition to form U 3 O 8 . Raman spectroscopy has confirmed the presence of uranyl ion and INT ligand in both complexes as well as the existence of nitrate vibrations in 1 and hydroxyl vibrations in 2. Their photoluminescence properties have been investigated.
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