Systematic Structure–Property Investigations on a Series of Alternating Carbazole–Thiophene Oligomers
摘要:
A series of alternating carbazole-thiophene oligomers, namely 2,7-linked carbazole-thiophene oligomers 1, 3, 5, 7, and 9 and 3,6-linked ones 2, 4, 6, 8, and 10, in which the molecular length was systematically elongated, were synthesized by Suzuki-Miyaura coupling reactions. The effects of the conjugation connectivity between the carbazole and thiophene moieties and the molecular length on the electronic, photophysical, and electrochemical properties of 1-10 were comprehensively investigated. In the present oligomer architectures, the connection with thiophene at the 2,7-positions of carbazole ensures pi-conjugation to a high extent and high fluorescence quantum yields, while that at the 3,6-positions enhances the donor ability. The increase in the molecular length of the 2,7-linked oligomers effectively extends pi-conjugation. The relationship between structural variations and photophysical properties was examined by fluorescence lifetime measurements in detail. The X-ray crystal structure of 6 was also disclosed.
One-Step Versus Multistep Equilibrium of Carbazole-Bridged Dinuclear Zinc(II) Complex Formation: Metal-Assisted π-Association and -Dissociation Processes
作者:Norie Inukai、Tsuyoshi Kawai、Junpei Yuasa
DOI:10.1002/chem.201403036
日期:2014.11.10
whether molecular assembly occurs through a one‐step or stepwise manner in ligand‐bridged dinuclearzinc(II) (Zn2+) complexformation, which is associated with the π stacking of building blocks. The building blocks of carbazole ligands (L1 and L4) that contain two imidazole moieties at the 3,6‐positions form 4:2 complexes (i.e., [L]4(Zn2+)2) at a molar ratio of 0.50 ([Zn2+]/[L]0=0.50), thereby providing
values of ca. 10–5 cm2·V–1·s–1 were recorded for the [4]cyclocarbazoles. The characteristics (threshold voltage VTH, subthreshold swing SS, trapping energy ΔE) recorded for the three [4]cyclocarbazoles appear to be modulated by the alkyl chain length borne by the nitrogen atoms. Remarkably, the space-charge-limited current mobilities measured for the [4]cyclocarbazoles are about 3 orders of magnitude higher
A 2,7-carbazole-based dicationic salt for fluorescence detection of nucleic acids and two-photon fluorescence imaging of RNA in nucleoli and cytoplasm
作者:Xin Liu、Yuming Sun、Yuanhong Zhang、Fang Miao、Guancong Wang、Hongshi Zhao、Xiaoqiang Yu、Hong Liu、Wai-Yeung Wong
DOI:10.1039/c1ob05123g
日期:——
A new carbazole-derived dicationic compound, namely 2,7-bis(1-hydroxyethyl-4-vinylpyridinium iodine)-N-ethylcarbazole (2,7-9E-BHVC), with a large two-photon action absorption cross section in nucleic acids has been obtained. Moreover, it possesses the potential of imaging RNA in nucleoli and cytoplasm in two-photon fluorescence microscopy and exhibits good counterstain compatibility with the commercial fluorescent nucleic dye DAPI.
KIT FOR DETECTING ctDNA AND EXPRESSION OF DRUG-RESISTANT GENES RELATED TO APPLICABILITY OF TUMOR CHEMOTHERAPEUTIC DRUGS
申请人:GUIZHOU MEDICAL UNIVERSITY
公开号:US20190300961A1
公开(公告)日:2019-10-03
A kit for determining ctDNA concentration and a method for determining ctDNA concentration is disclosed, wherein the method comprising dissolving extracted ctDNA in Tris-HCl buffer with pH>7.0 and adding into the buffer 2,7-bis(1-methyl-4-vinylpyridine)-9-ethylcarbazole iodised salt as a molecular probe, calculating the concentration of ctDNA in the solution by measuring the Fluorescence intensity of the solution. It has extremely high sensitivity in the determination of 0 μg/ml˜50 μg/ml ctDNA solution.
Donor–Acceptor Type Pendant Conjugated Molecules Based on a Triazine Center with Depressed Intramolecular Charge Transfer Characteristics as Gain Media for Organic Semiconductor Lasers
A set of fluorene‐capped pendant conjugated molecules (T‐m and T‐p), which consist of a triazine center with three carbazole substituents as the donor–acceptor (D‐A) type pendant structure, were designed, synthesized, and investigated as gain media for organicsemiconductor lasers (OSLs). In particular, varying the capping positions of the fluorene units on the pendant core structures results in significantly