A family of 3D UO22+-5-X-1,3-dicarboxylate (X = -H, -NO2, -NH2, -OH) hybrid materials: structural relevance with variation of substituent groups and photochemical properties

Four new 3D uranyl complexes, [(UO2)(2)(H2O)(ipa)(2)]center dot 9H(2)O (1), [(UO2)(2)(H2O)(nip)(2)]center dot H2O center dot Et3NH (2), [(UO2)(2)(H2O)(aip)(2)]center dot Et3NH (3) and [(UO2)(hip)](2)H2O (4) (H(2)ipa = isophthalic acid, H(2)nip = 5-nitroisophthalic acid, H2aip = 5-aminoisophthalic acid, H(2)hip = 5-hydroxyisophthalic acid, Et3N = triethylamine), were hydrothermally synthesized. Structural analyses reveal that Compound 14 consist of pentagonal bipyramidal uranyl monomers bridged via acid inkers to form a structural motif, [(UO2)(2)L-2], serving as the foundation for the 3D framework. Two structural motifs adopt different arrangement mode to connect to two types of chains. For 13, uranium atoms and carboxyl groups being from two types of chains respectively are coordinated to build the similar 3D frameworks, while for 4, one type of chain links to 3D architecture by the bond of the uranium atoms and OH of 5-hydroxyisophthalic acid ligands. The different guest molecules and structure assembling displayed throughout four compounds is a function of the variation of substituent groups for 5-X-1,3-benzenedicarboxylic acid (X = H, NO2, NH2, OH). Furthermore, the photocatalytic properties of 2 and 4 for degradation of the rhodamine-B (RhB) upon xenon lamp irradiation have been examined. Elemental analysis, infrared spectroscopy, DRS and luminescence properties were also discussed