The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Xingyuan Liu - One of the best experts on this subject based on the ideXlab platform.
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two dimensional directed π π interactions in a linear shaped bi 1 3 4 Oxadiazole Derivative to achieve organic single crystal with highly polarized fluorescence and amplified spontaneous emissions
Journal of Materials Chemistry, 2012Co-Authors: Lijun Wang, Xingyuan LiuAbstract:We report the role of the molecular structure and molecular interactions of linear shaped bi-1,3,4-Oxadiazole Derivatives (BOXD-n) on their self-assembly behaviors and optical properties. The terminal chains of BOXD-n (n = 1, 4) play an important role in molecular self-assembling and their optical properties. High fluorescence efficiency (ΦF = 56%) was observed in BOXD-4 single crystal, while relatively low fluorescence efficiency (ΦF = 21%) was observed in BOXD-1 single crystal. Highly polarized fluorescence (Imax/Imin of 23) and deep blue ASE (λ = 403 nm, threshold of about 20 kW cm−2) were observed in BOXD-4 single crystal, in which molecules uniaxially J-type aggregate through both face-to-face and edge-to-edge π–π interactions between 1,3,4-Oxadiazole rings and phenyl rings. No polarized fluorescence or ASE phenomenon was observed in BOXD-4 vacuum evaporated films.
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waveguide and ultralow threshold amplified spontaneous emission in an aligned ordered solid state based on a highly fluorescent twin tapered bi 1 3 4 Oxadiazole Derivative
Chemical Communications, 2011Co-Authors: Lijun Wang, Xingyuan LiuAbstract:Strong fluorescence and amplified spontaneous emissions (ASE) both in solution and aligned ordered solid state were observed from a twin-tapered bi-1,3,4-Oxadiazole Derivative, which could be used in preparing functional supramolecular architectures with ultralow-threshold ASE.
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evolution from lyotropic liquid crystal to helical fibrous organogel of an achiral fluorescent twin tapered bi 1 3 4 Oxadiazole Derivative
Chemistry: A European Journal, 2011Co-Authors: Lijun Wang, Xingyuan LiuAbstract:We report an unprecedented hierarchical self-assembly of an achiral twin-tapered bi-1,3,4-Oxadiazole Derivative (2,2-bis(3,4,5-trioctanoxyphenyl)-bi-1,3,4-Oxadiazole, BOXD-T8). This molecule can form a layer-structured lyotropic liquid crystal and further forms a helical fibrous organogel in DMF at concentrations above 0.6 wt %. The self-assembly process of BOXD-T8 in DMF is accompanied by a change in its fluorescence. The pitches of the helical fibers are non-uniform, and both left- and right-handed helical fibers are observed in equal quantities. Intermolecular π-π interactions between aromatic segments have been demonstrated to be the driving force for aggregate formation. This helical structure of BOXD-T8 is dependent on the solvent, concentration, and the layer-structured intermediate liquid-crystalline state.
Lijun Wang - One of the best experts on this subject based on the ideXlab platform.
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two dimensional directed π π interactions in a linear shaped bi 1 3 4 Oxadiazole Derivative to achieve organic single crystal with highly polarized fluorescence and amplified spontaneous emissions
Journal of Materials Chemistry, 2012Co-Authors: Lijun Wang, Xingyuan LiuAbstract:We report the role of the molecular structure and molecular interactions of linear shaped bi-1,3,4-Oxadiazole Derivatives (BOXD-n) on their self-assembly behaviors and optical properties. The terminal chains of BOXD-n (n = 1, 4) play an important role in molecular self-assembling and their optical properties. High fluorescence efficiency (ΦF = 56%) was observed in BOXD-4 single crystal, while relatively low fluorescence efficiency (ΦF = 21%) was observed in BOXD-1 single crystal. Highly polarized fluorescence (Imax/Imin of 23) and deep blue ASE (λ = 403 nm, threshold of about 20 kW cm−2) were observed in BOXD-4 single crystal, in which molecules uniaxially J-type aggregate through both face-to-face and edge-to-edge π–π interactions between 1,3,4-Oxadiazole rings and phenyl rings. No polarized fluorescence or ASE phenomenon was observed in BOXD-4 vacuum evaporated films.
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waveguide and ultralow threshold amplified spontaneous emission in an aligned ordered solid state based on a highly fluorescent twin tapered bi 1 3 4 Oxadiazole Derivative
Chemical Communications, 2011Co-Authors: Lijun Wang, Xingyuan LiuAbstract:Strong fluorescence and amplified spontaneous emissions (ASE) both in solution and aligned ordered solid state were observed from a twin-tapered bi-1,3,4-Oxadiazole Derivative, which could be used in preparing functional supramolecular architectures with ultralow-threshold ASE.
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evolution from lyotropic liquid crystal to helical fibrous organogel of an achiral fluorescent twin tapered bi 1 3 4 Oxadiazole Derivative
Chemistry: A European Journal, 2011Co-Authors: Lijun Wang, Xingyuan LiuAbstract:We report an unprecedented hierarchical self-assembly of an achiral twin-tapered bi-1,3,4-Oxadiazole Derivative (2,2-bis(3,4,5-trioctanoxyphenyl)-bi-1,3,4-Oxadiazole, BOXD-T8). This molecule can form a layer-structured lyotropic liquid crystal and further forms a helical fibrous organogel in DMF at concentrations above 0.6 wt %. The self-assembly process of BOXD-T8 in DMF is accompanied by a change in its fluorescence. The pitches of the helical fibers are non-uniform, and both left- and right-handed helical fibers are observed in equal quantities. Intermolecular π-π interactions between aromatic segments have been demonstrated to be the driving force for aggregate formation. This helical structure of BOXD-T8 is dependent on the solvent, concentration, and the layer-structured intermediate liquid-crystalline state.
Beihong Long - One of the best experts on this subject based on the ideXlab platform.
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nanoparticles helical fibers and nanoribbons of an achiral twin tapered bi 1 3 4 Oxadiazole Derivative with strong fluorescence
Langmuir, 2009Co-Authors: Lianjiu Zhao, Chengxiao Zhao, Peng Zhang, Ziyu Xiu, Beihong LongAbstract:A twin-tapered bi-1,3,4-Oxadiazole Derivative (BOXD-T8) showed a monomeric feature and intramolecular charge transition at concentrations lower than 10(-5) mol/L. BOXD-T8 molecules self-assembled to nanoparticles and further to helical nanofibers with blue fluorescence emission in DMSO, while nanoribbons resulted in an emission-enhanced gel in ethanol. The strong fluorescent emissions of BOXD-T8 in an isolated state in apolar solvents were attributed to the coplanar conformation of the rigid backbone and the strong fluorescent emissions of BOXD-T8 in the aggregation states were attributed to the coplanar conformation of the rigid backbone and J aggregation.
Haibo Wang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of schiff base based 1 2 4 Oxadiazole Derivative as fluorescence turn on sensor for high selectivity of pb 2
Journal of Fluorescence, 2015Co-Authors: Wei Liu, Xiaosheng Yuan, Haibo WangAbstract:A new probe based on Oxadiazole Derivative (OXD) containing Schiff base moiety was synthesised as fluorescence turn-on sensor S1 . Furthermore, its fluorescents spectra (FS) result demonstrate that S1 selectively senses bivalent lead ion (Pb2+) in HEPES buffer solution (10 mM, pH = 7.0,DMF-H2O, 9:1, v/v), so S1 was a viable candidate as fluorescent receptor for a new Pb2+ sensor. And the results of fluorescent spectral titration showed this sensor formed 1:1complex with Pb2+.
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synthesis of pyridine based 1 3 4 Oxadiazole Derivative as fluorescence turn on sensor for high selectivity of ag
Journal of Fluorescence, 2013Co-Authors: Chunling Zheng, Ailin Yuan, Zhengyu Zhang, Hong Shen, Shuyuan Bai, Haibo WangAbstract:An Oxadiazole Derivative(OXD) containing symmetrical pyridine-2-formamidophenyl-binded moiety was synthesised as fluorescence turn-on sensor OA1. Its ultraviolet–visible(UV–vis) and fluorescent spectra(FS) gave prominent fluorescence enhancement only for monovalent silver ion(Ag+) in HEPES buffer solution (10 mM, pH = 7.0, DMF-H2O, 9:1, v/v), which indicated the photo-induced electron transfer(PET) occurred from the donor of pyridine-2-formamidophenyl group to Oxadiazole fluorophore. The present study demonstrated that OA1 was a viable candidate as fluorescent receptor for a new Ag+ sensor. And the results of fluorescent spectral titration showed this sensor formed 1:1 complex with Ag+.
Dinesh R Godhani - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic properties of binary mixtures of 1 3 4 Oxadiazole Derivative with chloroform n n dimethyl formamide at 303 308 and 313 k and atmospheric pressure
Arabian Journal of Chemistry, 2017Co-Authors: Dinesh R Godhani, Purvesh B Dobariya, Anil M Sanghani, Jignasu P MehtaAbstract:Abstract The density (ρ), viscosity (η) and ultrasonic velocity (U) of pure solvents (chloroform (CF), N,N-dimethyl formamide (DMF)) and solutions of 2-((4-acetyl-5-(2-hydroxyphenyl)-5-methyl-4,5-dihydro-1,3,4-oxadiazol-2-yl)methylthio)-3-o-tolylquinazolin-4(3H)-one (PDI-C) (0.001, 0.002, 0.004, 0.006, 0.008, and 0.010 mol dm−3) in CF and DMF are investigated at 303, 308 and 313 K at atmospheric pressure. Various thermodynamic parameters such as acoustical impedance (Z), adiabatic compressibility (κa), inter molecular free path length (Lf), Rao's molar sound function (Rm), Van der Waals constant (b), internal pressure (π), relaxation time (τ), free volume (Vf) and solvation number (Sn) are calculated by using ρ, η and U data. The results obtained are interpreted in terms of solute–solvent and solute–solute interactions. The structure making or structure-breaking abilities of the solute in CF and DMF solvent are also studied.
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Thermodynamic properties of binary mixtures of 1,3,4-Oxadiazole Derivative with chloroform, N,N-dimethyl formamide at 303, 308 and 313 K and atmospheric pressure
Elsevier, 2017Co-Authors: Dinesh R Godhani, Purvesh B Dobariya, Anil M Sanghani, Jignasu P MehtaAbstract:The density (ρ), viscosity (η) and ultrasonic velocity (U) of pure solvents (chloroform (CF), N,N-dimethyl formamide (DMF)) and solutions of 2-((4-acetyl-5-(2-hydroxyphenyl)-5-methyl-4,5-dihydro-1,3,4-oxadiazol-2-yl)methylthio)-3-o-tolylquinazolin-4(3H)-one (PDI-C) (0.001, 0.002, 0.004, 0.006, 0.008, and 0.010 mol dm−3) in CF and DMF are investigated at 303, 308 and 313 K at atmospheric pressure. Various thermodynamic parameters such as acoustical impedance (Z), adiabatic compressibility (κa), inter molecular free path length (Lf), Rao's molar sound function (Rm), Van der Waals constant (b), internal pressure (π), relaxation time (τ), free volume (Vf) and solvation number (Sn) are calculated by using ρ, η and U data. The results obtained are interpreted in terms of solute–solvent and solute–solute interactions. The structure making or structure-breaking abilities of the solute in CF and DMF solvent are also studied
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effect of temperature and solvents on thermo physical properties of 1 3 4 Oxadiazole Derivative at atmospheric pressure
Journal of Molecular Liquids, 2013Co-Authors: Dinesh R Godhani, Purvesh B Dobariya, Anil M Sanghani, Anand A Jogel, Jignasu P MehtaAbstract:Abstract The density ( ρ ), viscosity ( η ) and ultrasonic velocity ( U ) of pure solvents: chloroform (CF), N , N -dimethylformamide (DMF), solutions of 2-((4-acetyl-5-(4-bromophenyl)-5-methyl-4,5-dihydro-1,3,4-oxadiazol-2-yl)methylthio)-3- o -tolylquinazolin-4(3 H )-one (PD I-D ) in CF and DMF were investigated at 303, 308 and 313 K and at atmospheric pressure. Using ρ , η and U data various acoustical and thermodynamic parameters such as acoustical impendence ( Z ), isentropic compressibility ( κ S ), intermolecular free path length ( L f ), Rao's molar sound function ( R m ), Van der Waals constant ( b ), internal pressure ( π ), relaxation time ( τ ), free volume ( V f ) and solvation number ( S n ) were calculated and fairly good co-relationship between calculated parameters were obtained. A fairly good to excellent correlation between a given parameter and concentration is observed at all temperatures and solvent systems studied. Linear or non-linear increases or decreases of acoustical parameters with concentration and temperature indicated the existence of strong molecular interactions between studied systems. Moreover, the experimental results for the pure solvents and solutions of compound PD I-D studied has been carried out to analyze carefully how the structural modifications affect the values of Gibbs energy of activation ( ΔG *), enthalpy of activation ( ΔH *) and entropy of activation ( ΔS *) in CF and DMF.
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effect of temperature and solvents on ultrasonic velocity and thermodynamic parameters of 1 3 4 Oxadiazole Derivative solutions
Journal of Molecular Liquids, 2012Co-Authors: Dinesh R Godhani, Purvesh B Dobariya, Anil M SanghaniAbstract:Abstract The present work describes the synthesis, characterization, thermal analysis and physico-chemical parameters of 2-((4-acetyl-5-methyl-5-phenyl-4,5-dihydro-1,3,4-oxadiazol-2-yl)methylthio)-3-o-tolylquinazolin-4( 3H )-one (PD I-H ). The compound PD I-H is synthesized by using standard protocols; purity is monitored by using TLC and characterized by IR and NMR spectral techniques. The thermal behavior of PD I-H was studied by TGA and DTA techniques at a heating rate of 10 °C/min in nitrogen atmosphere. Thermal stability and kinetic parameters were determined according to the Freeman–Anderson method. The density ( ρ ), viscosity ( η ) and ultrasonic velocity ( U ) of pure solvents (chloroform (CF), N,N -dimethyl formamide (DMF)) and solutions of PD I-H (0.01 – 0.001 M) in CF and DMF were investigated at three different temperatures: 303 K, 308 K and 313 K. Using ρ , η and U data various thermodynamic parameters such as adiabatic compressibility ( κ a ), intermolecular free path length ( L f ), Rao's molar sound function ( R m ), Van der Waals constant ( b ), internal pressure ( π ), free volume ( V f ) and solvation number ( S n ) were calculated. The results obtained were interpreted in terms of solute–solvent and solute–solute interactions. The structure making or structure-breaking abilities of the solute in CF and DMF solvent were also studied.
