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Issue 44, 2013
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An exploration of homo- and heterometallic UO22+ hybrid materials containing chelidamic acid: synthesis, structure, and luminescence studies

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Abstract

Six homometallic and two heterometallic UO22+/M (M = Na+, Sm3+) hybrid materials were synthesized hydrothermally and incorporate either chelidamic acid (4-hydroxy-2,6-pyridinedicarboxylic acid) or its chlorine substituted derivative: 4-chloro-2,6-pyridinedicarboxylic acid (4-chloro-2,6-pydc): [UO2(C7H2NO5)·Et3NH] (1); [(UO2)2(C7H2NO5)2]·4H2O (2); [(UO2)2(C7H2NO5)(OH)2(H2O)2]·H2O (3); [(UO2)2(C7H2NO5)2(H2O)] (4); [(UO2)2(SmO)7(C7H2NO5)2(C7H4NO5)2(OH)4(NO3)(H2O)3]·2H2O (5); [(UO2)2(C7H2NO4Cl)2(H2O)3]·H2O (6); [(UO2)(C7H2NO4Cl)2(H2O)]·H2O (7); and Na2[(UO2)3(C7H2NO4Cl)4] (8). The two ligands afforded the opportunity to explore the different structural contributions of a hydroxyl versus a halogen functional group located on the para position of 2,6-pyridinedicarboxylic acid. Whereas the hydroxyl group provided an additional metal coordination site, the chlorine atom offered the foundation for halogen-based intermolecular interactions within the hybrid materials. Additional metal centers (Na+ and Sm3+) were incorporated into frameworks of 5 and 8, respectively and formed 3D architectures. Luminescence data were collected and typical uranyl emission was exhibited by 6 only. Heterometallic compound 5 was absent of any metal-based (UO22+ or Sm3+) emission, as well as ligand fluorescence, suggestive of a self-quenching mechanism.

Graphical abstract: An exploration of homo- and heterometallic UO22+ hybrid materials containing chelidamic acid: synthesis, structure, and luminescence studies

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Article information


Submitted
20 Aug 2013
Accepted
18 Sep 2013
First published
23 Sep 2013

CrystEngComm, 2013,15, 9039-9051
Article type
Paper

An exploration of homo- and heterometallic UO22+ hybrid materials containing chelidamic acid: synthesis, structure, and luminescence studies

P. M. Cantos, S. J. A. Pope and C. L. Cahill, CrystEngComm, 2013, 15, 9039
DOI: 10.1039/C3CE41655K

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