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Fluorescence Sensing Properties of 2-(2'-Hydroxyphenyl)quinoline and Derivatives
Helal, Aasif,Lee, Sang-Hoon,Ren, Wen Xiu,Cho, Chan-Sik,Kim, Hong-Seok Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
Novel chemosensors based on 2-(2'-hydroxyphenyl)quinoline were prepared and evaluated for sensing metal cations. The photophysical properties of chemosensors 1-3 were examined and their ion-selectivity was evaluated by measuring their fluorescent emission responses to alkali, alkaline earth, and transition metal ions. Chemosensors 1, 2 and 3 show ratiometric and enhanced fluorescence changes with transitional metals that are efficient fluorescence quenchers, especially 3 has a high binding constant with $Hg^{+2}$ in $CH_3CN$.
Aasif Helal,Muhammad Usman,Md. Eyasin Arafat,Mahmoud M Abdelnaby 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
The conversion of epoxides to cyclic carbonates is one of the most common CO2 fixation reactions. Metalorganicframeworks (MOFs), due to their porosity, easily tunable properties and Lewis acidic sites, areextensively used in heterogeneous catalysis. In this paper, we report the derivatization of the metalorganicframework (MOF) UiO-66 (University of Oslo) with allyloxy groups to give UiO-66-BAT(BAT = bisallyloxyterephthalate). The catalyst was characterized by PXRD, BET, IR, SEM, digestion NMRand CO2 adsorption. UiO-66-BAT had a good CO2 uptake of 84 cc/g at 273K and a Qst value of 27.5 kJ mol 1. Due to the affinity of the allyloxy group toward CO2 and the proximity of the zirconium Lewis acid sites,we applied UiO-66-BAT as a catalyst for the conversion of epoxides to cyclic carbonates by using CO2. Weshowed that UiO-66-BAT converts propylene oxide (PO) to its corresponding cyclic carbonates at 50 C, a5 bar pressure, and a 6 h reaction time with a 95% yield. UiO-66-BAT also gave a good yield in theconversion of numerous aliphatic and aromatic epoxides. The catalysts exhibited a good recyclability forup to 9 cycles.
Fluorescence Sensing Properties of Thiazolobenzo-crown Ether Incorporating Coumarin
Sang Hoon Lee,Aasif Helal,김홍석 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.3
A new coumarin-thiazolobenzo-crown ether based fluorogenic chemosensor BTC (1) was reported. The ion-selective binding properties of 1 with different alkali, alkaline earth metals and transitional metals were investigated in an ethanol- DMSO system. BTC (1) showed the highest binding constant toward Hg2+ over Ag+, Pb2+ and Cu2+.
Fluorescence Sensing Properties of Thiazolobenzo-crown Ether Incorporating Coumarin
Lee, Sang-Hoon,Helal, Aasif,Kim, Hong-Seok Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.3
A new coumarin-thiazolobenzo-crown ether based fluorogenic chemosensor BTC (1) was reported. The ion-selective binding properties of 1 with different alkali, alkaline earth metals and transitional metals were investigated in an ethanol-DMSO system. BTC (1) showed the highest binding constant toward $Hg^{2+}$ over $Ag^+$, $Pb^{2+}$ and $Cu^{2+}$.
Schiff Base Ligand Coated Gold Nanoparticles for the Chemical Sensing of Fe(III) Ions
Jimoh, Abiola Azeez,Helal, Aasif,Shaikh, M. Nasiruzzaman,Abdul Aziz, Md.,Yamani, Zain H.,Al-Ahmed, Amir,Kim, Jong-Pil Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>New Schiff base-coated gold nanoparticles (AuNPs) of type AuNP@L (where L: thiolated Schiff base ligand) have been synthesized and characterized using various spectroscopic techniques. The AuNPs and AuNP@L were imaged by transmission electron microscopy (TEM) and were confirmed to be well-dispersed, uniformly distributed, spherical nanoparticles with an average diameter of 8–10 nm. Their potential applications for chemosensing were investigated in UV-Vis and fluorescence spectroscopic studies. The AuNP@L exhibited selectivity for Fe<SUP>3+</SUP>in an ethanol/water mixture (ratio 9 : 1 v/v). The absorption and emission spectral studies revealed a 1 : 1 binding mode for Fe<SUP>3+</SUP>, with binding constants of8.5×<SUP>105</SUP>and2.9×<SUP>105</SUP> M<SUP>−1</SUP>, respectively.</P>