Kalaj Mark, Carter Korey P, Cahill Christopher L
Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, DC 20052, USA.
Acta Crystallogr B Struct Sci Cryst Eng Mater. 2017 Apr 1;73(Pt 2):234-239. doi: 10.1107/S2052520617001639. Epub 2017 Mar 29.
The synthesis and crystal structure of a new uranyl coordination polymer featuring 3-bromo-5-iodobenzoic acid is described and the luminescent and vibrational properties of the material have been explored. Compound (1), [UO(CHBrIO)], features dimeric uranyl units chelated and then linked by 3-bromo-5-iodobenzoic acid ligands to form a one-dimensional coordination polymer that is subsequently assembled via bifurcated halogen-bonding interactions with uranyl oxo atoms to form a supramolecular three-dimensional network. The asymmetric, bifurcated halogen-bonding interaction in (1) is notable as it represents the first observation of this synthon in a uranyl hybrid material. Raman and IR spectroscopy showed that halogen-bonding interactions with the uranyl oxo atoms result in small shifts in υ and υ frequencies, whereas luminescence spectra collected at an excitation wavelength of 420 nm reveal partially resolved uranyl emission.
描述了一种以3-溴-5-碘苯甲酸为特征的新型铀酰配位聚合物的合成及晶体结构，并对该材料的发光和振动性质进行了研究。化合物(1)，[UO(CHBrIO)]，具有二聚铀酰单元，该单元通过3-溴-5-碘苯甲酸配体螯合，然后连接形成一维配位聚合物，随后通过与铀酰氧原子的分叉卤键相互作用组装形成超分子三维网络。(1)中的不对称分叉卤键相互作用值得注意，因为它代表了在铀酰杂化材料中首次观察到这种合成子。拉曼光谱和红外光谱表明，与铀酰氧原子的卤键相互作用导致υ和υ频率发生小的位移，而在420 nm激发波长下收集的发光光谱显示铀酰发射部分得到分辨。
