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Selective and visual Ca2+ ion recognition in solution and in a self-assembly organogel of terpyridine-based derivative triggered by ultrasound

26-Aug-2015 | Li Jun Geng; Yajuan Li; Zengyao Wang; Yan Qiu Wang; Guoliang Feng; xue lei pang; Xudong Yu, Soft Matter, 2015

a new kind of terpyridine-based Ca2+ sensor TS based on internal charge transfer (ICT) was designed and studied. In the diluted solution state, TS sensed Ca2+ and Mg2+ ions among test ions via “off–on” approach as seen from fluorescence spectra among test ions. Moreover, TS was able to form ...

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Mechanisms of L‐lysine extraction with sec‐octylphenoxy acetic acid in sulfonated kerosene

20-Aug-2015 | Chunhua Zhao, Xiaohua Zhou, Yan Xiao, Dan Wang, Zhen Zhou, Zhixiong Yang, Xiaoqin Jiang, Jiang Wang, Journal of Chemical Technology & Biotechnology, 2015

Abstract Backgound Currently, the dominant theories on extraction mechanisms of amino acids are mainly deduced from mathematical models or reaction equations, it is thus necessary to obtain direct evidences for the extraction mechanisms by experimental methods. This paper aims to reveal the ...

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Reversible Piezofluorochromic Property and Intrinsic Structure Changes of Tetra(4-methoxyphenyl)ethylene under High Pressure

20-Aug-2015 | Jinxia Wu; Jia Tang; Hailong Wang; Qingkai Qi; Xiaofeng Fang; Yifei Liu; Shuping Xu; Sean Xiao-An. Zhang; Houyu Zhan ..., Journal of Physical Chemistry A, 2015

During the past decade, luminescent mechanochromism has received much attention. Despite the garnered attention, only a few studies have reported the effect of internal molecular structure change on the performance of mechanochromic fluorescence. Here, we chose tetra(4-methoxyphenyl)ethylene ...

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Ion Pair−π Interactions

20-Aug-2015 | Kaori Fujisawa; Marie Humbert-Droz; Romain Letrun; Eric Vauthey; Tomasz A. Wesolowski; Naomi Sakai; Stefan Matile, Journal of the American Chemical Society, 2015

We report that anion−π and cation−π interactions can occur on the same aromatic surface. Interactions of this type are referred to as ion pair−π interactions. Their existence, nature, and significance are elaborated in the context of spectral tuning, ion binding in solution, and activation of ...

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Fluorescence chemical sensor based on water‐soluble poly(p‐phenylene ethynylene)–graphene oxide composite for Cu2+

18-Aug-2015 | Naoya Adachi, Mai Nakajima, Mari Okada, Masafumi Sugeno, Takayuki Norioka, Polymers for Advanced Technologies, 2015

A chemical sensor for metal ions was fabricated based on a water‐soluble conjugated polymer–graphene oxide (GO) composite. Water‐soluble poly(p‐phenylene ethynylene) (PPE) with sulfonic acid side chain groups was used to prepare a very stable water‐soluble PPE–GO composite with strong π–π ...

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Ruthenium(II) and Osmium(II) Vinyl Complexes as Highly Sensitive and Selective Chromogenic and Fluorogenic Probes for the Sensing of Carbon Monoxide in Air

13-Aug-2015 | Anita Toscani, Cristina Marín‐Hernández, María E. Moragues, Félix Sancenón, Paul Dingwall, Neil J. Brown, Ramón Mart ..., Chemistry - A European Journal, 2015

Abstract The detection of carbon monoxide in solution and air has been achieved using simple, inexpensive systems based on the vinyl complexes [M(CHCHR)Cl(CO)(BTD)(PPh3)2] (R=aryl, BTD=2,1,3‐benzothiadiazole). Depending on the nature of the vinyl group, chromogenic and fluorogenic responses ...

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Solvatochromism, Reversible Chromism and Self‐Assembly Effects of Heteroatom‐Assisted Aggregation‐Induced Enhanced Emission (AIEE) Compounds

13-Aug-2015 | Caixia Niu, Ying You, Liu Zhao, Dacheng He, Na Na, Jin Ouyang, Chemistry - A European Journal, 2015

Abstract Two compounds, 9,10‐bis[2‐(quinolyl)vinyl]anthracene (BQVA) and 9,10‐bis[2‐(naphthalen‐2‐yl)vinyl]anthracene (BNVA), have been synthesised and investigated. Both of them have aggregation‐induced enhanced emission (AIEE) properties. Heteroatom‐assisted BQVA shows solvatochromism, ...

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H-Aggregates of an Indocyanine Cy5 Dye: Transition from Strong to Weak Molecular Coupling

13-Aug-2015 | Hans v. Berlepsch; Christoph Böttcher, Journal of Physical Chemistry B, 2015

The aggregation behavior of an Indocyanine Cy5 dye (2-[5-[1,1-dimethyl-3-(4-sulfobutyl)-1,3-dihydro-benzo[e]indol-2-ylidene]-penta-1,3-dienyl]-1,1-dimethyl-3-(4-sulfobutyl)-1H-benzo[e]indolium hydroxide, inner salt, sodium salt) in aqueous solution is investigated using absorption and ...

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Thermoswitchable Nanoparticles Based on Elastin-like Polypeptides

13-Aug-2015 | Bettina Kracke; James T. Cole; Christoph J. O. Kaiser; Björn Hellenkamp; Stefanie Krysiak; Ali Ghoorchian; Gary B. B ..., Macromolecules, 2015

The design of biocompatible particles with defined size on the nanometer scale has proven to be a challenging task in current biomedical research. Here we present an approach toward temperature-responsive nanoparticles by covalently cross-linking micelles based on trimeric constructs of ...

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A Fluorescent Probe for Hg2+ Based on Gold(I) Complex with An Aggregation‐Induced Emission Feature

12-Aug-2015 | Xie Han, Xiaoyi Lü, Zhao Chen, Guangao Yu, Jun Yin, Shenghua Liu, Chinese Journal of Chemistry, 2015

Abstract A gold(I) complex that exhibited aggregation‐induced emission in acetonitrile‐water mixtures was designed. It showed high selectivity and sensitivity for Hg2+ in acetonitrile‐H2O (1:1, V:V) solution. Dynamic light scattering measurements were conducted to verify that the addition of ...

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