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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
Fanwei Wang, Hongdong Duan, Dianxiang Xing, Geng Yang
One novel turn-on fluorescence probe founded on conjugated pyrazole Schiff base for detecting Al(3+) was invented. The UV-vis and fluorescence spectrometer were employed to explore optical properties of this probe. The results got from those experiments indicated that this fluorescence probe manifested excellent sensitivity and selectivity for Al(3+) compared with other cations examined(Ag(+), Co(2+), Mg(2+), Cu(2+), Ni(2+), Pb(2+),and Zn(2+)). In addition, this probe displayed a more rapid response and remained stable between pH 6 and 9 by investigating the fluorescence intensity under different response time and various pH values...
May 11, 2017: Journal of Fluorescence
Giovanny Carvalho Dos Santos, Roberta Oliveira Servilha, Eliézer Fernando de Oliveira, Francisco Carlos Lavarda, Valdecir Farias Ximenes, Luiz Carlos da Silva-Filho
This paper describes the investigations on the solvatochromic effect and the photophysical properties of quinoline derivatives, compounds with potential applicability in optoelectronic devices. Using an experimental and theoretical approach, the effect of the solvent and the insertion of the phenyl, nitro, amino and dimethylamino group in the quinoline backbone were investigated. The use of Density Functional Theory (DFT) calculations provided the bases for the understanding of the energetic transitions observed in the absorption and fluorescence experiments...
May 11, 2017: Journal of Fluorescence
Niloofar Mansourian, Mahdi Rahaie, Morteza Hosseini
MicroRNAs (miRNA) are a novel class of small noncoding RNAs with roles in RNA silencing and post transcriptional regulation of gene expression. Due to their roles, miRNA can be considered as new biomarkers for prognosis of diseases such as Multiple sclerosis (MS). Herein, we report a miRNA nanobiosensor based on nucleic acid hybridization chain reaction and highly fluorescent DNA hosted silver nanoclusters (NC). In our method, two types of hairpin oligonucleotide probes, MB1 and MB2, were employed as hybridization chain reaction (HCR) monomers, where MB1 acted as a template for in situ synthesis of fluorescent Ag NC...
May 6, 2017: Journal of Fluorescence
Naresh Kumar, Jagdeep Kumar, Prasanta Kumar Hota
Donor-acceptor conjugated molecules with efficient light induced properties represent interesting material for electronic device application. In this context, we have calculated excited state dipole moment of three ethenyl thiophenes (1-3) bearing varied electron donor-acceptor substituent in p-phenyl unit using Lippert-Mataga, Bakhshiev and Kawski method. It is found that 1 with strong electron-withdrawing nitro substituent, is exhibiting charge transfer and highly dipolar excited state as compared to 2 and 3...
May 5, 2017: Journal of Fluorescence
Amit K Dash, Ashutosh S Yende, Rakesh K Tyagi
Arrivals of fluorescent proteins have revolutionized the way we do research in the areas of molecular cell biology. In the present study, we have successfully exploited the multimer-forming property of Red Fluorescent Protein (RFP) in living cells to preferentially shift the unliganded nuclear receptors from the nuclear to the cytoplasmic compartment. Subsequently, these cytoplasmic-shifted unliganded receptors could be induced to translocate into the nucleus by their ligands. Though the multimerization of RFP as a protein-tag is viewed as a disadvantage, we have exploited and projected this property towards novel applications in validating the clinical drugs, herbal compounds, metabolic disruptors etc...
May 3, 2017: Journal of Fluorescence
Cindy Patinote, Kamel Hadj-Kaddour, Marjorie Damian, Carine Deleuze-Masquéfa, Pierre Cuq, Pierre-Antoine Bonnet
The fluorescence properties of eleven novel derivatives based on the imidazo[1,2-a]quinoxaline structures have been studied. The absorption and emission spectra of these compounds have been recorded in dimethylsulfoxide solution. The phenyl substituting group on position 1 gives them particular properties thanks to the diverse hydroxy or methoxy decorating moieties, especially when they are multiplied or mixed. The investigated fluorescence auto-quenching revealed that the decreasing fluorescence intensity correlated only with the chemical structures of the aromatic compounds...
May 3, 2017: Journal of Fluorescence
Katy Schäfer, Heiko Ihmels
The solvatochromic 9-hydroxybenzo[b]quinolizinium ion is shown to operate as fluorescent probe for the detection of water in acetonitrile. The dual fluorescence of this photoacid and its dependence on the content of water in the medium enable the ratiometric analysis of the fluorescence data. Graphical Abstract ᅟ.
May 2, 2017: Journal of Fluorescence
Jinjun Cheng, Yan Zhao, Meiling Zhang, Yue Zhang, Xiaoman Liu, Xin Yan, Yongzhi Wang, Ziwei Sun, Qingguo Wang, Huihua Qu
We have been looking for a faster and simpler method for traditional Chinese medicine and natural product assay. In this study, we developed a fluorescent immunoassay approach to detect icariin (ICA) using a fluorescently labelled monoclonal antibody. The ICA-specific antibody was purified by the caprylic acid-ammonium sulphate method and then labelled with rhodamine B isothiocyanate (RBITC). Subsequently, an indirect competitive fluorescence-linked immunosorbent assay (icFLISA) was developed to detect ICA using RBITC-labelled anti-ICA MAbs...
May 2, 2017: Journal of Fluorescence
Abdullah M Asiri, Al-Anood M Al-Dies, Salman A Khan
(2E)-1-(2,5-dimethylfuran-3-yl)-3-(9-ethyl-9H-carbazol-3-yl)prop-2-en-1-one (DEPO) was prepared by the reaction of 9-ethyl-9H-carbazole-3-carbaldehyde with 1-(2,5-dimethylfuran-3-yl)ethanone under microwave irradiation. The structure of DEPO was established experimentally by EI-MS, FT-IR, (1)H and (13)C NMR spectral studies. Electronic absorption and emission spectra of DEPO were studied in different solvents on the basis of polarities, and the obtain data were used to determine the solvatochromic properties such as extinction coefficient, oscillator strength, transition dipole moment, stokes shift, fluorescence quantum yield and photochemical quantum yield...
April 26, 2017: Journal of Fluorescence
Gomathi Vellaiswamy, Selvameena Ramaswamy
Two new Co(II) complexes of 4-((3-ethoxy-2-hydroxybenzylidene)amino)-N-(thiazol-2-yl)benzenesulphonamide and 4-((pyridin-2-ylmethylene)amino)-N-(thiazol-2-yl)benzene sulfonamide were synthesised. The structure of the complexes was identified by elemental analysis, FT-IR, electronic, EI mass, Powder XRD spectra and magnetic moment. The TG and DTA patterns of the complexes were supported the structures. The fluorescence quenching of these complexes with alizarin dye were premeditated and the free energy change (∆Get) for electron transfer process was designed by Rehm-Weller equation...
April 26, 2017: Journal of Fluorescence
Amrit Krishna Mitra, Abhishek Sau, Uttam Pal, Chandan Saha, Samita Basu
This paper vividly indicates that steady state as well as time-resolved fluorescence techniques can serve as highly sensitive monitors to explore the interactions of 5,7-dimethoxy-2,3,4,9-tetrahydro-1H-carbazol-1-one with model transport proteins, bovine serum albumin (BSA) and human serum albumin (HSA). Besides these, we have used fluorescence anisotropy study to assess the degree of restrictions imparted by the micro-environments of serum albumins. Again, to speculate the triplet excited state interaction between such fluorophore and albumin proteins (BSA& HSA), laser flash-photolysis experiments have been carried out...
April 22, 2017: Journal of Fluorescence
Rahul D Telore, Amol G Jadhav, Nagaiyan Sekar
Synthesis of novel 3,6-di(substituted quinoxalin) carbazole fluorophores by the condensation of 1,1'-(9-ethyl-9H-carbazole-3,6-diyl)bis(2-bromoethanone) with methyl, chloro and unsubstituted o-phenylenediamine is presented. Synthesized derivatives are well characterized by (1)H NMR, (13)C NMR, FTIR and Mass spectroscopy. Photophysical studies are carried out using solvents of varying polarities revealed positive solvatochromism and intramolecular charge transfer from carbazole (Donor) to quinoxalin (Acceptor)...
April 22, 2017: Journal of Fluorescence
Derya Topkaya, Serap Alp
Coumarin-oxazol-5-one (COX), 3a-d, were synthesized with 7-methoxy-2-oxo-2H-chromene-4-carbaldehyde and benzoylglycine derivatives. The characterizations of the COX derivatives by (1)H NMR, FT-IR and elemental analysis were achieved. To obtain the photophysical data of the synthesized COX derivatives were used spectrophotometric and spectrofluorimetric methods. Evaluation of the absorption and emission properties of the structures was carried out in six different solvents. Maximum absorption and emission wavelengths (λ; nm), molar extinction coefficients (ε; cm(-1) M(-1)), Stoke's shifts (ΔλST; nm) and quantum yields (ϕF), of the COX derivatives were declared...
April 22, 2017: Journal of Fluorescence
Rajender Reddy Mallepally, Nagamani Chintakuntla, Venkat Reddy Putta, Nagasuryaprasad K, Ravi Kumar Vuradi, Madhuri P, Satyanarayana Singh S, Ramesh Kumar Chitumalla, Joonkyung Jang, Nagababu Penumaka, Satyanarayana Sirasani
In this paper a novel ligand debip (2-(4-N,N-diethylbenzenamine)1H-imidazo[4,5-f] [1, 10]phenanthroline) and its Ru(II) polypyridyl complexes [Ru(L)2(debip)](2+), (L = phen (1), bpy (2) and dmb (3)) have been synthesized and characterized by spectroscopic techniques. The DNA binding studies for all these complexes were examined by absorption, emission, quenching studies, viscosity measurements and cyclic voltammetry. The light switching properties of complexes 1-3 have been evaluated. Molecular docking, Density Functional Theory (DFT) and time dependent DFT calculations were performed...
April 22, 2017: Journal of Fluorescence
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