- Two Emissive Long-Lived Excited States of an Imidazole-Functionalized Ruthenium Dipyridophenazine Complex
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A ruthenium(II) polypyridine-type complex based on the dipyridophenazine ligand with a directly fused imidazole unit (L1, dipyrido[3,2-a:2′,3′-c]phenazine-10,11-imidazole) has been synthesized, and its electrochemical and photophysical properties have been studied. The cyclic voltammogram of [Ru(tbbpy)2(L1)]2+ (C1) (tbbpy is 4,4′-tert-butyl-2,2′-bipyridine) shows a cathodic shift of the phenazine-based reduction process compared to similar molecules, while the first detected reduction wave (-1.34 V vs Fc/Fc+) is assigned to the imidazole unit within the molecule. On the basis of the TD-DFT calculations, the strong visible absorption band exhibited by C1 is assigned to a metal-to-ligand charge transfer (MLCT) transition with a concurrent ligand-centered (LC) transition. At room-temperature, C1 features emission (φ = 0.04) from its lowest excited states with time constants of 1.2 and 18.3 μs. These lifetimes are assigned to emission processes from the 3MLCT and 3LC state, respectively. This is the first time that a long-lived dual emission has been observed for a ruthenium(II) complex bearing a directly fused extended π-system. Furthermore, the emission of C1 is quenched upon water addition. In contrast to related compounds based on a dipyridophenazine ligand, the excited state energy is not shifted, and the lifetime is drastically decreased to 169 ns.
- Isakov, Dajana,Giereth, Robin,Nauroozi, Djawed,Tschierlei, Stefanie,Rau, Sven
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supporting information
p. 12646 - 12653
(2019/10/11)
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- BENZIMIDAZOLE DERIVATIVES AND PHARMACEUTICAL COMPOSITIONS AND USES THEREOF
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The present invention relates to benzimidazole derivatives and their pharmaceutical compositions and uses, specifically to benzimidazole derivatives of Formula (I), or their stereoisomer, pharmaceutically acceptable salt or solvates thereof, in which R1, R2, R3, R4, R5 and n have the definitions in the description; the present invention further relates to a pharmaceutical composition containing the compounds, methods for preparing the compounds, and use of the compounds for manufacturing of a medicament for prophylaxis and/or treatment of peptic ulcer, ulcer hemorrhage and diseases associated with gastric acid.
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Page/Page column 32
(2013/02/27)
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- Molecular "light switch" for G-quadruplex DNA: Cycling the switch on and off
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We report a new G-quadruplex DNA "light switch", where the light switch can be cycled on and off through the successive introduction of G-quadruplex DNA and [Fe(CN)6]4- ions.
- Shi, Shuo,Zhao, Juan,Gao, Xing,Lv, Chunyan,Yang, Li,Hao, Jian,Huang, Hailiang,Yao, Junliang,Sun, Wenliang,Yao, Tianming,Ji, Liangnian
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scheme or table
p. 5789 - 5793
(2012/06/15)
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- Diazotisation of 5,6-diamino-1H-benzimidazole
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The synthesis of the bis(diazonium) salt derived from 5,6-diamino-1H- benzimidazole and subsequent coupling with β-naphthol are reported. The coupling reaction gives an imidazo-benzotriazole derivative when the diazotization is performed with nitrosyl hydrogen sulfate and a mono-azo compound when coupling is done in the presence of concentrated HCl.
- Dincer, Sebla
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p. 193 - 196
(2007/10/03)
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- Composition of matter having bioactive properties
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Particles of coordinated complex comprising a basic, hydrous polymer and a capacitance adding compound, as well as methods for their production, are described. These complexes exhibit a high degree of bioactivity making them suitable for a broad range of applications through their incorporation into conventional vehicles benefiting from antimicrobial and similar properties.
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