A new fluorescent and colorimetric probe for trace hydrazine with a wide detection range in aqueous solution
摘要:
A new fluorescent and colorimetric probe based on the reaction and intramolecular charge transfer (ICT) effect is designed and synthesized. The probe responds rapidly toward hydrazine and exhibits distinct color changes from yellow to colorless, indicating its use as a color indicator for hydrazine. Moreover, the probe also shows a significant broad band fluorescence (410-700 nm) enhancement by similar to 120-fold after the addition of hydrazine. With a detection limit as low as 0.11 ppb, the probe can detect hydrazine in a wide concentration range because of the blunted sensing functional group. The contrast test shows almost no interruption from common elements in water, suggesting the high selectivity of this probe toward hydrazine. The theoretical calculation based on density functional theory (DFT) is also performed and two different ICT modes are found. This hydrazine probe would be a promising candidate applicable in environment protection, water treatment and safety inspection. (C) 2013 Elsevier Ltd. All rights reserved.
Phosphorescent platinum(<scp>ii</scp>) alkynyls end-capped with benzothiazole units
作者:Rebeca Lara、Elena Lalinde、M. Teresa Moreno
DOI:10.1039/c7dt00029d
日期:——
3] and the mixed alkynyl–cyanide anionic complex (NBu4)2[trans-Pt(CC-pbt)2(CN)2] (4) were synthesized. The complexes have been fully characterized including X-ray crystallography for 2 and 4. All complexes display long-lived emission with moderate quantum yields (ϕ 6.8–22.6%) in doped PMMA films at 298 K and complex 4 is also emissive in DMSO fluid and in rigid media (solid, glass at 77 K). Complex
A new fluorescence probe for distinguishing Zn2+ and Cd2+ is designed and synthesized. For the first time to our knowledge, this probe can recognize similar metal ions by coherently utilizing intramolecular charge transfer (ICT) and different electronic affinities of various metal ions, instead of by selective coordination alone, which may be interfered with and lose its selectivity easily in a complicated
申请人:The United States of America as represented by the Secretary of the Air
公开号:US04892953A1
公开(公告)日:1990-01-09
Phenylbenzthiazole-substituted p-terphenylene dicarboxylic acids of the formula ##STR1## wherein R.sub.1 is --H or ##STR2## R.sub.2 is ##STR3## R.sub.3 is ##STR4## and R.sub.4 is R.sub.2 or ##STR5##
Synthesis, photophysics, and reverse saturable absorption of platinum complexes bearing extended π-conjugated C^N^N ligands
作者:Zhongjing Li、Wenfang Sun
DOI:10.1039/c3dt51430g
日期:——
The synthesis of ligands 1-L–6-L that feature the 6-[9,9-di(2-ethylhexyl)-7-R-9H-fluoren-2-yl]-2,2′-bipyridine (C^N^N) core (R = 4-R′-phenylethynyl with R′ = NO2, benzothiazol-2-yl (BTZ), H and OCH3 or R = 4′-BTZ-phenyl or BTZ) and their platinumcomplexes 1–6 were reported in this paper. The photophysical properties of these ligands and the Pt(II) complexes, including the UV-vis absorption spectra
具有6- [9,9-二(2-乙基己基)-7- R -9 H-芴-2-基] -2,2′-联吡啶的配体1-L–6-L的合成(C ^ N ^ N)核(R = 4-R'-苯基乙炔基,R'= NO 2,苯并噻唑-2-基(BTZ),H和OCH 3或R = 4'-BTZ-苯基或BTZ)及其铂本文报道了复合物1-6。这些配体和Pt(II)的光物理性质)系统研究了包括紫外可见吸收光谱,室温和77 K下的发射特性以及三重态瞬态差吸收光谱在内的配合物,以了解取代基在1-的4位上的作用。乙炔基苯基成分以及C ^ N ^ N核与BTZ取代基之间π共轭的延伸。使用4.1 ns激光脉冲在532 nm处证明了配合物1-6的反向饱和吸收(RSA)。1-L–6-L的紫外可见吸收光谱的特征是强1π,π*在蓝色光谱区跃迁,吸收带通过在乙炔基苯基基序的4位取代和扩展的π-共轭作用而有效地红移。观察到类似的效果,这些配体在CH的荧光