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A Family of Uranyl Coordination Polymers Containing O‑Donor Dicarboxylates and Trispyridyltriazine Guests

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posted on 06.01.2016, 00:00 authored by Sonia G. Thangavelu, Christopher L. Cahill
Four uranyl coordination polymers [UO2(C6H8O4)­(H2O)2]­(C18H12N6)2 (1), [UO2(C8H4O4)­(H2O)2]­(C18H12N6)2 (2), Na­[(UO2)­(C12H6O4)2]­(C18H13N6)­·H2O (3), and Na­[(UO2)­(C16H8O4)­(C6H3NO2)]­(C18H12N6)­·H2O (4) containing aliphatic (adipic acid) or aromatic linkers (1,4-benzene dicarboxylic acid (BDC), 1,4-napthalene dicarboxylic acid (NDC), anthracene 9,10-dicarboxylic acid (ADC)) were synthesized and characterized using single crystal X-ray diffraction, powder X-ray diffraction, and luminescence spectroscopy. The π-stacking distances or the number of π–π interactions present between trispyridyltriazine (TPTZ) guests or the host framework in 14 may be affected by the size of the O-donor linker (adipic acid < BDC < NDC < ADC). Luminescence studies show that substitution between adipic acid and BDC influences the emission of 1 and 2, in which the emission of 1 shows a red shift relative to that of 2. Uranyl emission was not observed in 3 and 4, and may be attributed to the position of the NDC and ADC triplet state relative to the emissive uranyl species.