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Journal of Fluorescence

K B Akshaya, Anitha Varghese, Y N Sudhakar, Prajwal Lourdes Lobo, Louis George
A novel N-arylphthalamic acid derivative, 2-({4-[(1H-1,2,4-triazol-1-yl)methyl]phenyl}carbamoyl)benzoic acid (TMPCB) was synthesized and their absorption and emission spectra were recorded in fifteen different solvents of varying polarities at room temperature. Ground state dipole moment of the derivative was calculated experimentally by Guggenheim method and solvatochromic approach proposed by Bilot-Kawski. The singlet excited state dipole moment of TMPCB were calculated experimentally based on different approaches of solvent polarity function proposed by Lippert-Mataga, Bakhshiev, Kawskii-Chamma-Viallet, Reichardt and Bilot-Kawski...
June 21, 2017: Journal of Fluorescence
Masaru Sakamaki, Shunichi Aikawa, Yasumasa Fukushima
The commercially available natural organic dye, carminic acid (CA), an anthraquinone derivative bearing hydroxyl and carboxyl groups as recognition sites was found to be a colorimetric probe for Pb(2+) in perfect aqueous solution under neutral conditions with specific selectivity and high sensitivity. Upon addition of Pb(2+), the absorption maximum of CA showed a large red shift, and the resulted color change from red to purple could be easily identified even by the naked eye. The chemical stoichiometric ratio between CA and Pb(2+) was determined to be 1:2 through Job plot, Pb(2+) titration, and kinetic experiments...
June 21, 2017: Journal of Fluorescence
Yalan Liu, Qiujun Lu, Xiaojun Hu, Haiyan Wang, Haitao Li, Youyu Zhang, Shouzhuo Yao
Clenbuterol (CLB), a member of β-agonist family, has now been a serious threat to human health due to its illegal usage in the animal feed. In this paper, we designed a fluorescence resonance energy transfer (FRET) system consisting of carbon dots (C-dots) and gold nanoparticles (AuNPs) for recovered fluorescence detecting of CLB. In the presence of CLB, CLB molecules can interact with AuNPs via Au-N bonds, preventing the interaction of C-dots and AuNPs, which induced the recover of the fluorescent intensity...
June 20, 2017: Journal of Fluorescence
Lingyun Wang, Shaochun Zhuo, Derong Cao
No abstract text is available yet for this article.
June 13, 2017: Journal of Fluorescence
Vani R Desai, Shirajahammad M Hunagund, Malatesh S Pujar, Mahantesha Basanagouda, Jagadish S Kadadevarmath, Ashok H Sidarai
Herein, we report photophysical properties of a novel and biologically active 3(2H)-pyridazinone derivative 5-(4-chloro-2-hydoxy-phenyl)-2-phenyl-2H-pyridazin-3-one [CHP] molecule using solvatochromic approaches. Absorption and fluorescence spectra of CHP molecule have been measured at room temperature in various solvents of different polarities. From this, it is observed that the positions, intensities and shapes of the absorption and emission bands are usually modified. Experimentally, the ground and excited state dipole moments are estimated using solvatochromic shift method which involves Lippert's, Bakshiev's and Kawski-Chamma-Viallet's equations...
June 5, 2017: Journal of Fluorescence
Wei Su, Shizhuang Yuan, Enju Wang
A new rhodamine-based fluorescent chemosensor (1) has been designed and synthesized by linking rhodamine 6G hydrazide with N-methylisatin via an imine linkage. The receptor can selectively recognize and sense Pb(2+), Hg(2+) and Cd(2+) by showing different fluorescence characteristics. In ethanol/HEPES buffer medium, the addition of Cd(2+) caused a yellowish-green fluorescence, while the presence of Pb(2+) or Hg(2+) gave rise to an orange fluorescence. Additionally, the sensor shows an irreversible fluorescence response to Pb(2+) and reversible fluorescence responses to Hg(2+) and Cd(2+)...
June 3, 2017: Journal of Fluorescence
Vani R Desai, Shirajahammad M Hunagund, Mahantesha Basanagouda, Jagadish S Kadadevarmath, Ashok H Sidarai
Herein, we have studied the analysis of fluorescence quenching for newly synthesized biologically active 3(2H)-pyridazinone derivative 5-(5-bromo-2-hydroxy-phenyl)-2-phenyl-2H-pyridazin-3-one [BHP] by various concentrations of aniline using UV-Visible spectroscopy, fluorescence spectroscopy and time-correlated single photon counting technique in five different solvents namely, methanol, ethanol, propan-2-ol, dimethylsulfoxide and ethyl acetate at room temperature. The fluorescence intensity of BHP molecule decrease with increasing in the aniline concentration and it is studied using the Stern-Volmer relation...
May 31, 2017: Journal of Fluorescence
Nina N Boroznovskaya, Maria M Godneva, Alexandra P Korneva, Anton V Klimkin
No abstract text is available yet for this article.
May 31, 2017: Journal of Fluorescence
Zahra Shafaei, Omid Abazari, Adeleh Divsalar, Behafarid Ghalandari, Atefeh Poursoleiman, Ali Akbar Saboury, Faizan Ahmad
In the present study, biological evaluation of a new synthesized anti-cancer compound, amyl-glycine1, 10-phenanthroline Platinum nitrate (Pt(II) complex), was investigated at different temperatures by spectroscopic methods (far-UV circular dichroism (CD) and fluorescence) and modeling methods (docking and FRET). Human serum albumin (HSA), one of the vital proteins in drug delivery system in the body, was used as a target protein. The Pt(II) complex is able to quench the intrinsic fluorescence of HSA considerably...
May 29, 2017: Journal of Fluorescence
Ankush B More, Nagaiyan Sekar
The acetyl acetone and benzoyl acetone pyrene based difluoroboron scaffolds and their respective decomplexed congeners were investigated for their nonlinear optical properties in various microenvironment. The geometries of the chromophore were optimized and electronic excitation properties were estimated using time dependant density functional theory. The vertical excitation properties were found to be complimentary to the experimental results. Nolinear optical properties were evaluated using solvatochromism and Density Functional Theory...
May 26, 2017: Journal of Fluorescence
Kaixin Xia, Guowen Zhang, Song Li, Deming Gong
Vanillin (VAN) and ethyl vanillin (EVA) are widely used food additives as flavor enhancers, but may have a potential security risk. In this study, the properties of binding of VAN or EVA with calf thymus DNA (ctDNA) were characterized by multi-spectroscopic methods, multivariate curve resolution-alternating least-squares (MCR-ALS) algorithm and molecular simulation. The concentration profiles for the components (VAN or EVA, ctDNA and VAN-ctDNA or EVA-ctDNA complex) by the MCR-ALS analysis showed that VAN or EVA interacted with ctDNA and formed VAN-ctDNA or EVA-ctDNA complex...
May 25, 2017: Journal of Fluorescence
João Lagarto, Jonathan D Hares, Christopher Dunsby, Paul M W French
Autofluorescence lifetime measurements, which can provide label-free readouts in biological tissues, contrasting e.g. different types and states of tissue matrix components and different cellular metabolites, may have significant clinical potential for diagnosis and to provide surgical guidance. However, the cost of the instrumentation typically used currently presents a barrier to wider implementation. We describe a low-cost single point time-resolved autofluorescence instrument, exploiting modulated laser diodes for excitation and FPGA-based circuitry for detection, together with a custom constant fraction discriminator...
May 25, 2017: Journal of Fluorescence
Nagaraj Revathi, Murugesan Sankarganesh, Jegathalaprathaban Rajesh, Jeyaraj Dhaveethu Raja
A new pyrimidine derivative Schiff base ligand (HL) [HL = 2-(4,6-dimethylpyrimidin-2-ylimino)methyl)-4-nitrophenol] and its metal(II) complexes [CuL2] (1), [CoL2] (2), [NiL2] (3) and [ZnL2] (4) have been synthesized and characterized by several spectral techniques. The square planar geometry of the complexes 1-4 confirmed by UV-Visible, ESR and EI-mass spectral techniques. DNA binding study of the complexes 1-4 with Calf Thymus (CT) DNA using absorption spectral titration at different pH (4.0, 7.0 & 10.0) have been scrutinized that the complexes 1-4 bound by groove binding mode with significant binding constant values (K b  = 5...
May 24, 2017: Journal of Fluorescence
Elvan Vanlı, Miraç Nedim Mısır, Hakan Alp, Tuğba Ak, Nurhayat Özbek, Ümmühan Ocak, Miraç Ocak
Four fluorescent Schiff bases carrying dipicolylamine groups were designed and synthesized to determine their ion sensor properties in partial aqueous solution. The corresponding amine compound and the aldehyde compounds such as 1-naphthaldehyde, 9-anthraldehyde, phenanthrene-9-carboxaldehyde and 1-pyrenecarboxaldehyde were used to prepare the new Schiff bases. The influence of many metal cations and anions on the spectroscopic properties of the ligands was investigated in ethanol-water (1:1) by means of emission spectrometry...
May 23, 2017: Journal of Fluorescence
Jian Zhang, Aidong Peng, Yanlin Lv, Yuanlin Zhang, Xuefei Wang, Guangjin Zhang, Zhiyuan Tian
A colorimetric fluorescent probe with fluorescence emission feature sensitive to SO2 derivatives, i.e. bisulfite (HSO3(-)) and sulfite (SO3(2-)), was developed based on the HSO3(-)/SO3(2-)-mediated nucleophilic addition reaction of the probe that. This probe exhibited SO3(2-) sensing ability with detection limit down to 46 nM and desired selectivity over other reference anions and redox species. The preliminary fluorescence bioimaging experiments have validated the practicability of the as-prepared probe for SO2 derivatives sensing in living cells...
May 21, 2017: Journal of Fluorescence
Kevser Temizkan, İsmet Kaya
Polyazomethines containing silane and phosphazene groups were synthesized via elimination reactions of dihydroxy compounds containing imine bonding with phosphazane and silane dichloride. The structures of monomers and polymers containing phosphazane and silane groups were supported by (1)H-NMR, (13)C-NMR, FT-IR and UV-Vis techniques. Electrochemical properties of the prepared Schiff bases and polymers were given by cyclic voltammetric (CV) analysis. Thermal properties of synthesized monomers and polymers were determined by TG-DTA and TG-DTA, DMA and DSC techniques, respectively...
May 17, 2017: Journal of Fluorescence
Bixia Lin, Ying Yu, Fangfei Liu, Yujuan Cao, Manli Guo
Indole propionic acid (IPA) is one of the important plant growth hormones for promoting rooting and fruiting. Labeling IPA receptor in plant tissues is able to further track the signal transduction processes of IPA and uncover the function mechanism of IPA on crop productions. In this paper, a tunable and nontoxic fluorescent probe for IPA receptors was designed and synthetized base on carbon dots (C dots). Firstly carboxyl-modified carbon dots were prepared by high temperature cracking of citric acid. The fluorescence emission wavelengths of C dots varied with the excitation wavelengths change...
May 15, 2017: Journal of Fluorescence
Milind R Shreykar, Nagaiyan Sekar
The newly synthesized three coumarin pyrazole hybrid excited state intramolecular proton transfer (ESIPT) dyes show efficient charge transfer from the pyrazole ring and the coumarin towards the electron withdrawing dicyanovinylene group as revealed from the frontier molecular orbitals. Aggregation induced emission enhancement (AIEE) studies with 2-((3-(4-hydroxy-2-oxo-2H-chromen-3-yl)-1-phenyl-1H-pyrazol-4-yl)methylene) malononitrile showed 9 fold increase in the emission enhancement in 90% DMF-H2O mixture...
May 13, 2017: Journal of Fluorescence
Ke Wang, Xue Mao, Liling Cao, Guoping Lv, Xinfeng Dong, Yan He, Yongju Wei
Based on the photoinduced electron transfer (PET) principle, 4-amino-7-nitro-2,1,3-benzoxadiazole (ANBD) has been used as a fluorophore to develop a new fluorescent probe, 4-(2-N,N-dimethylthioacetamide)amino-7-nitro-2,1,3-benzoxadiazole (2), for the detection of Hg(2+). Upon the addition of Hg(2+), a 46-fold fluorescence enhancement occurs. Moreover the probe 2 exhibits a high selectivity and sensitivity to Hg(2+), even in the presence of other common metal ions. Under optimal reaction conditions, a good linearity can be obtained in the range of 0...
May 13, 2017: Journal of Fluorescence
Umesh Warde, Nagaiyan Sekar
Two benzo[h]chromen-3-yl)ethylidene) malononitrile styryl hybrid dyes are synthesized and characterized by NMR and elemental analysis. One is based on nitrogen donor and other on oxygen (3b and 3b respectively). Dyes are low emissive in the solution but dramatically showed increase in emission intensity in aggregates form in the THF (tetrahydrofuran) /water system. Dyes are also sensitive to viscosity and showed increased emission intensity in the DCM:PEG 400 system and DMF:PEG 400 system respectively. Dyes 3a and 3b showed higher viscosity sensitivity constant (0...
May 12, 2017: Journal of Fluorescence
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