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Journal of Fluorescence

Serkan Erdemir, Begum Tabakci
An efficient fluorescent sensor based on fluorescein-benzothiazole (FB) for Zn(2+) ion was synthesized and characterized systematically. FB exhibited selective and sensitive recognition toward Zn(2+) in MeCN-H2O (v/v = 2/1) over other cations due to the spirolactam ring-opening power of Zn(2+). The complexation property of FB with Zn(2+) ion was examined by (1)H NMR, (13)C NMR and FTIR experiments. The stoichiometric ratio of the FB-Zn(2+) complex was determined from a Job plot to be 1:1. The binding constant (K a) of Zn(2+) binding to FB was found to be 4...
September 14, 2017: Journal of Fluorescence
Xiao Xu, Yuan-Cheng Cao, Jun'An Liu, Yongjun Lin
The wide use of pesticide p-fluorophenoxyacetic acid has caused the serious environmental contaminant. A novel fluorescent probe for sensitive detection of p-fluorophenoxyacetic acid in aqueous solutions based on 3.0G quaternary ammonium polyamidoamine (PAMAM) dendrimer modified quantum dots (QDs) (PAMAM@QDs) was reported. Through the solvent-evaporation method, quaternary ammonium PAMAM was employed to modify the QDs. Poloxamer 188 was used to improve the solubility and stability. The resultant PAMAM@QDs dispersed well in water...
September 11, 2017: Journal of Fluorescence
Arkadiusz Matwijczuk, Andrzej Górecki, Marcin Makowski, Katarzyna Pustuła, Alicja Skrzypek, Joanna Waś, Andrzej Niewiadomy, Mariusz Gagoś
The article presents the results of fluorescence analyses of 2-methylamino-5-(2,4-dihydroxyphenyl)-1,3,4-thiadiazole (MDFT) in an aqueous environment. MDFT dissolved in aqueous solutions with a pH value in the range from 1 to 4.5 yielded an interesting effect of two clearly separated fluorescence emissions. In turn, a single fluorescence was observed in MDFT dissolved in water solutions with a pH value from 4.5 to 12. As it was suggested in the previous investigations of other 1,3,4-thiadiazole compounds, these effects may be associated with conformational changes in the structure of the analysed molecule accompanied by aggregation effects...
September 9, 2017: Journal of Fluorescence
Fang Xie, Fangyu Peng
Copper complexes with strong anticancer activity are promising new drugs for treatment of patients with metastatic cancer. Copper 8-hydroxyquinoline-2-carboxaldehyde-thiosemicarbazide (CuHQTS) and copper 8-hydroxyquinoline-2-carboxaldehyde-4,4-dimethyl-3-thiosemicarbazide (CuHQDMTS) were found to have strong anticancer activity against cisplatin-resistant neuroblastoma cells and prostate cancer cells. This study aimed to synthesize and characterize two new anticancer copper complexes, copper complex of (4R)-(-)-2-Thioxo-4-thiazolidinecarboxylic acid (CuTTDC), and copper complex of 3-Rhodaninepropionic acid-copper complex (CuRDPA)...
September 9, 2017: Journal of Fluorescence
Yang Hu, Yan-Yan Liu, Qiao Li, Jing-Yu Sun, Sheng-Li Hu
New colorimetric and fluorometric fluoride ion probe, anthra[1,9-cd]pyrazol- 6(2H)-one (1), was synthesized by one-step condensation. The probe 1 shows F(-)-selective color change from colorless to pink and appearance of red fluorescence. The fluorescence quantum yield of free probe 1 in DMSO was calculated to be 0.03. After addition of 15 equiv. of F(-), its fluorescence quantum yield can be increased to 0.37. The analytical detection limit for F(-) was 2.8 × 10(- 7) M. (1)H NMR analysis and DFT calculation show that the F(-)-induced colorimetric and fluorometric responses of 1 are driven by deprotonation process...
September 8, 2017: Journal of Fluorescence
Marimuthu Senthilkumaran, Kalimuthu Maruthanayagam, Ganesan Vigneshkumar, Ramesh Kumar Chitumalla, Joonkyung Jang, Paulpandian Muthu Mareeswaran
The interaction of n-(4-hydroxyphenyl)-imidazole with p-sulfonatocalix[4]arene is studied using fluorescence technique. The quenching of fluorescence intensity explains the efficiency of binding via binding constant and quenching constant. The excited state lifetime of n-(4-hydroxyphenyl)-imidazole is decreased upon interaction with p-sulfonatocalix[4]arene. The cyclic voltametric studies emphasized the interaction of n-(4-hydroxyphenyl)-imidazole with p-sulfonatocalix[4]arene. Quantum chemical calculations are carried out to study the interactions as well as charge transfer between the host and the guest upon complexation...
September 8, 2017: Journal of Fluorescence
Shrikant S Thakare, Goutam Chakraborty, Shantaram Kothavale, Soumyaditya Mula, Alok K Ray, Nagaiyan Sekar
BODIPY fluorophores linked with an imidazo-phenanthroline donor at α and β positions have been synthesized. Intriguing intramolecular charge transfer phenomenon is observed in both the dyes which has been extensively investigated using UV-vis absorption, steady-state and time-resolved fluorescence measurements. H-bonding and intrinsic polarity of the solvents has modulated the absorption and emission bands of these fluorophores strongly causing significant increase in the Stokes shifts. In spite of having difference only in terms of the position of donor subunit, the photophysics of these dyes are not only significantly different from each other, but contradictory too...
September 6, 2017: Journal of Fluorescence
Galyna P Gorbenko, Valeriya Trusova, Julian G Molotkovsky
Specific interactions between a mitochondrial hemoprotein cytochrome c (cyt c) and cardiolipin, a lipid component of mitochondrial membrane, are crucial to electron shuttling and apoptotic activities of this protein. In the present study the Förster resonance energy transfer (FRET) between anthrylvinyl-labeled phosphatidylcholine as a donor and heme moiety of cyt c as an acceptor was employed to give a quantitative characterization of the protein binding to the model membranes from the mixtures of phosphatidylcholine (PC) with phosphatidylglycerol (PG), phosphatidylserine (PS) or cardiolipin (CL) in different molar ratios...
September 6, 2017: Journal of Fluorescence
Guan-Yeow Yeap, Yi-Huan Chan, Wan Ahmad Kamil Mahmood
A novel, 100% water-soluble chalcone based chemosensing receptor {1-[3-(2-Hydroxy-phenyl)-3-oxo-propenyl]-naphthalen-2-yloxy}-acetic acid, L was synthesized and characterized. The receptor L is designed based on the chelation enhanced fluorescence (CHEF) mechanism. The chemosensing properties of L were evaluated by UV-vis and fluorescence spectrometric methods. It exhibits highly selective recognition ability towards aluminum ions in water over other metal ions. The binding stoichiometry of L- Al(3+) complex is 2:1 by means of Job's plot and the detection limit is 5...
August 30, 2017: Journal of Fluorescence
Umesh Neupane, R N Rai
The phase diagram representing solid-liquid equilibrium of entire range of composition and thermodynamic studies of two binary organic systems of 4-dimethylaminobenzaldehyde (DMAB) with two NLO active compounds, p-aminoacetanilide (PAA) and p-nitroaniline (PNA), have been studied by solid state synthetic route. Both systems are independently forming a new entity called intermolecular complex (IMC) and two eutectics on either side of intermolecular complexes. The various thermodynamic parameters such as heat of mixing, entropy of fusion, roughness parameter, interfacial energy and excess thermodynamic functions of IMCs and eutectics were calculated using the heat of fusion values...
August 28, 2017: Journal of Fluorescence
Morteza Hosseini, Freshteh Khaki, Ehsan Shokri, Hossein Khabbaz, Mehdi Dadmehr, Mohammad Reza Ganjali, Mina Feizabadi, Davood Ajloo
A novel sensitive method for detection of DNA methylation was developed with thioglycollic acid (TGA)-capped CdTe quantum dots (QDs) as fluorescence probes. Recognition of methylated DNA sites would be useful strategy due to the important roles of methylation in disease occurrence and developmental processes. DNA methylation occurs most often at cytosine-guanine sites (CpG dinucleotides) of gene promoters. The QDs significantly interacted with hybridized unmethylated and methylated DNA. The interaction of CpG rich methylated and unmethylated DNA hybrid with quantum dots as an optical probe has been investigated by fluorescence spectroscopy and electrophoresis assay...
August 25, 2017: Journal of Fluorescence
Manzoor Ahmad Wani, Mrituanjay D Pandey, Rampal Pandey, Sandeep Kumar Maurya, Debabrata Goswami
We report a structure of ferrocene-pyrene conjugate (1) comprising electro and photo-active dual-signaling units. In particular, 1 upon interaction with Cu(II), displays selectively one-photon fluorescence quenching, but it shows two-photon absorption (TPA) cross-section 1230 GM (at 780 nm). Further, 1 displayed two irreversible oxidative waves at 0.39 V and 0.80 V (vs Ag/AgCl), in the electrochemical analysis which upon addition of Cu(2+), led to the negative potential shift in both the oxidative waves to appear at 0...
August 24, 2017: Journal of Fluorescence
Leyla Gündoğdu, Nihan Şen, Cevher Gündoğdu Hızlıateş, Mustafa Yavuz Ergün
Four new carbazole-oxadiazole derivatives (3a-b, 6a-b) were prepared from the reaction of aromatic aldehydes and carbohydrazides which were synthesized from carbazole aldehydes namely 9-hexyl-9H-carbazole-3-carbaldehyde 1 and 4-(9H-carbazole-9-yl)benzaldehyde 4 and acid hydrazides. The structures of the new derivatives were confirmed by (1)H-NMR and FT-IR. The optical properties such as 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 carbazole-oxadiazole derivatives were declared in dichloromethane, toluene and tetrahydrofuran solutions...
August 24, 2017: Journal of Fluorescence
Gökhan Yeğiner, Mehmet Gülcan, Sema Işık, Gülsiye Öztürk Ürüt, Sadin Özdemir, Mükerrem Kurtoğlu
The pyrimidine based azo-linked Schiff base ligand, 5-benzoyl-1-((E)-(2-hydroxy-3-methoxy-5-((E)phenyldiazenyl)benzylidene)amino)-4-phenylpyrimidin-2(1H)-one (HL), and its transition metal (II) complexes were synthesized and defined by using (1)H-NMR, (13)C-NMR, Elemental analysis, FT-IR, MS, UV-vis, molar conductance, magnetic susceptibility and thermal analysis techniques. According to the conductance data obtained indicate all of the metal complexes have non-electrolytic nature. Square pyramidal geometry for Pd(II) and octahedral geometry for all the other complexes synthesized was concluded from the electronic absorption spectra and magnetic susceptibility measurements of the complexes...
August 24, 2017: Journal of Fluorescence
Weerachai Nasomphan, Pramuan Tangboriboonrat, Srung Smanmoo
A new "turn-on" fluorescent chemosensor based on dansyl derivative was prepared for Cu(2+) ion sensing. Hydroxyl, imine and azomethine groups in Schiff base derived compound 1 were deliberately introduced for facilitating the binding of Cu(2+) ion. Of screen metal ions, compound 1 showed a high degree of selectivity toward Cu(2+) ion. Other interfering metal ions did not affect the fluorescence intensity of compound 1, except Hg(2+) and Fe(3+) ions exhibited a significant degree of fluorescence quenching. Upon binding of Cu(2+) ion, compound 1 displayed a chelation enhanced fluorescence (CHEF) resulting in increasing of the fluorescence intensity...
August 23, 2017: Journal of Fluorescence
Norman Scholz, Amol Jadhav, Milind Shreykar, Thomas Behnke, Nithiya Nirmalananthan, Ute Resch-Genger, Nagaiyan Sekar
A comprehensive systematic study of absorption and fluorescence properties in solvents of varying viscosity and polarity of three novel and red-emitting coumarin-rhodamine hybrid derivatives with differences in the rigidity of their substituents is presented. This includes ethanol-polyethylene glycol, toluene-polyethylene glycol, and toluene-paraffin mixtures. Moreover, protonation-induced effects on the spectroscopic properties are studied. A viscosity-induced emission enhancement was observed for all coumarin-rhodamine hybrid derivatives...
August 23, 2017: Journal of Fluorescence
C Shobha Devi, B Thulasiram, S Satyanarayana, Penumaka Nagababu
This review describes the analytical techniques used to detect DNA-probes such as Ru(II) complexes with hetero cyclic imidazo phenanthroline (IP) ligands. Studies on drug-DNA interactions are useful biochemical techniques for visualization of DNA both in vitro and in vivo. The interactions of small molecules that binds to DNA are mainly classified into two major classes, one involving covalent binding and another non-covalent binding. Covalent binding in DNA can be irreversible and may leads to inhibition of all DNA processes which subsequently leads to cell death...
August 22, 2017: Journal of Fluorescence
Yogesh Erande, Umesh Warde, Nagaiyan Sekar
BORICO dyes with N, N-diethyl as a strong donor and BF2 complexed iminocoumarin six member core as strong acceptor are investigated as an efficient non linear optical chromophores. Extended π-conjugation over iminocoumarin moiety is useful to make ICT character of BORICO dyes more significant and is established on the scale of Generalised Mulliken Hush analysis scale. Bond length alternation and bond order alternation values for three BORICO chromophores estimates the cyanine like framework for optimal non linear optical response...
August 22, 2017: Journal of Fluorescence
Nayan Roy, Surjatapa Nath, Pradip C Paul, T Sanjoy Singh
Fluorescence properties of N, N'-bis(salicylidene) trans 1, 2-diaminocyclohexane (H 2 L) is used to probe the anionic (SDS), cationic (CTAB) and nonionic (TX-100) micelles as well as in serum albumins (BSA and HSA) and chicken egg white lysozyme (LYZ) by steady state and picosecond time-resolved fluorescence spectroscopy. The fluorescence band intensity was found to increase with concomitant blue-shift with gradual addition of different surfactants. All the experimental results suggest that the probe molecule resides in the micelle-water interface rather than going into the micellar core...
August 22, 2017: Journal of Fluorescence
Guocheng Zhu, Yongning Bian, Andrew S Hursthouse, Peng Wan, Katarzyna Szymanska, Jiangya Ma, Xiaofeng Wang, Zilong Zhao
Natural organic matter (NOM) found in water sources is broadly defined as a mixture of polyfunctional organic molecules, characterized by its complex structure and paramount influence on water quality. Because the inevitable release of pollutants into aquatic environments due to an ineffective control of industrial and agricultural pollution, the evaluation of the interaction of NOM with heavy metals, nanoparticles, organic pollutants and other pollutants in the aquatic environment, has greatly increased. Three-dimensional (3-D) fluorescence has the potential to reveal the interaction mechanisms between NOM and pollutants as well as the source of NOM pollution...
August 21, 2017: Journal of Fluorescence
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