3314-30-5Relevant articles and documents
Meso -(2-Benzimidazolyl)-substituted BODIPYs: Synthesis, structures and spectroscopic properties
Gao, Hu,Li, Chenhong,Shen, Zhen
, p. 230 - 237 (2020)
A series of meso-(2-benzimidazolyl)-substituted boron dipyrromethene (BODIPY) derivatives 3a-3c and 4 have been synthesized and characterized. The absorption and fluorescence bands of 3a are bathochromically shifted by 36 nm and 61 nm, respectively, compared with those of the meso-phenyl BODIPY in toluene. More importantly, the fluorescence quantum yields of these meso-(2-benzimidazolyl)-substituted BODIPYs (up to 0.45 in toluene) are much higher than those of the previously reported meso-heterocyclic BODIPYs. X-ray crystallographic analysis of the single crystal structure of 3a revealed that the dihedral angle of meso-benzimidazolyl ring and indacene plane (40.47) is smaller compared with that of the meso-tolyl substituted BODIPY (61.4). Replacement of the six-membered ring with a five-membered ring, as well as the absence of hydrogen at the imino-nitrogen, generated the reduced repulsion and the hydrogen bonding interaction. The increased planarity not only provided the substantial delocalization of π electrons and red shifted the absorption and emission bands but also enhanced the fluorescence quantum yield by reducing free rotation induced nonradiative deactivation pathway. Furthermore, 3,5-distyryl coupled BODIPY 4 exhibits a NIR fluorescence band at 712 nm with moderate quantum yield (φF > 0.3) in nonpolar and polar solvents, which indicate that meso-(2-benzimidazolyl) BODIPY acts as a good candidate for post modification toward NIR dyes for biological applications.
A novel rhodamine-benzimidazole conjugate as a highly selective turn-on fluorescent probe for Fe3+
Li, Junbo,Hu, Qihui,Yu, Xianglin,Zeng, Yang,Cao, Cancan,Liu, Xiwen,Guo, Jia,Pan, Zhiquan
, p. 2005 - 2013 (2011)
In this manuscript, a novel probe RHBI based on the rhodamine-benzimidazole conjugate was designed and synthesized. RHBI showed an extreme selectivity for Fe3+ over other metal ions such as Pb2+, Ni2+, Co2+, Mn2+, Zn2+, Hg2+, Cd 2+, Ag+, Mg2+, Ca2+, Ba 2+, Na+ and K+ in acetonitrile. Upon the addition of 10 equiv. of Fe3+, a 1098-fold fluorescence intensity enhancement was observed at the maximum emission wavelength of 582 nm. Both the Job's plot and ESI-MS showed that RHBI coordinated with Fe3+ in a 1:1 stoichomitry and the calculated binding constant was 1. 01∈×∈104 M-1. The competition experiment for Fe3+ ions mixed with other metal ions exhibited no obvious change except Cu2+ that could induce a mild fluorescence quenching. Moreover, the fluorescence emission increased linearly with the Fe3+ concentration in the range of 6∈×∈10-6- 4∈×∈10-5 M and the detection limit was 1.5∈×∈10-8 M.
Ruthenium complex as well as preparation method and application thereof
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Paragraph 0028-0031, (2018/04/01)
The invention relates to a ruthenium complex as well as a preparation method and application thereof. A structure of the ruthenium complex is shown in a formula (I), (II) or (III): the formulas (I), (II) and (III) are shown in the description. Hydrogen peroxide oxidizing 2-hydroxyalkyl benzimidazole can be catalyzed by the ruthenium complex provided by the invention at temperature of less than 80 DEG C so as to prepare 2-carbonyl benzimidazole; moreover, the catalytic activity is strong, the catalytic reaction yield is high, a condition is mild and the pollution is little.
