1. One-dimensional uranium(VI) coordination polymers with pyridinecarboxylate ligands.
- Author
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Shepherd, Nicholas D., Zhang, Yingjie, Karatchevtseva, Inna, Price, Jason R., Kong, Linggen, Scales, Nicholas, and Lumpkin, Gregory R.
- Subjects
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COORDINATION polymers synthesis , *URANIUM compounds , *CARBOXYLATES , *LIGANDS (Chemistry) , *HYDROTHERMAL synthesis , *PICOLINIC acid , *DIMERS , *HYDROLYSIS - Abstract
A method to produce picolinate ligand in situ under hydrothermal conditions has been used to synthesize four uranyl hydroxyl, oxo- and oxohydroxyl picolinato complexes. (UO 2 )(OH)(Pic) ( 1 ) (HPic = picolinic acid) contains 7-fold coordinated uranyl hydroxyl dimers linked through μ 2 -bridging Pic ligands forming a one-dimensional (1D) polymer. (NH 4 )[(UO 2 ) 3 (O) 2 (OH)(Pic) 2 ] ( 2 ) consists of 7-fold coordinated uranyl oxohydroxyl trinuclear units linked through both μ 2 - and μ 3 -Pic ligands forming a 1D polymer. (NH 4 )[(UO 2 ) 2 (O) 2 (Pic)] ( 3 ) is constructed with 7-fold coordinated uranyl oxo-dinuclear units linked through oxo- and μ 3 -Pic ligands forming a 1D polymer. (NH 4 )[(UO 2 ) 4 (O) 2 (OH) 2 (Pic) 2 (INT)]·H 2 O ( 4 ) (HINT = isonicotinic acid) is made of 7-fold coordinated uranyl oxohydroxyl tetranuclear units linked through both Pic and INT ligands forming a 1D polymer. All four polymers are thermal robust to 350 °C. Raman spectroscopy confirmed the presence of uranyl ion and Pic ligand. In addition, red enhanced fluorescence emissions have been observed for both 1 and 4 . The synthesis method, with the advantage of controlling uranyl hydrolysis and generating ligand in situ , provides a more reliable way to make new coordination polymers of carboxylate ligands with various uranyl hydrolysis species. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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