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Journal of Fluorescence

Na-Na Li, Shuang Zeng, Ming-Qiang Li, Yu-Qing Ma, Xue-Jiao Sun, Zhi-Yong Xing, Jin-Long Li
A novel naphthalimide-based colorimetric and fluorescent turn-on chemosensor for Al(3+) was synthesized and characterized with spectroscopic techniques. In MeOH solution, BPAM showed high selectivity and sensitivity to Al(3+) by a 60-fold fluorescence enhancement and blue-shift absorption with visible color changes attributed to the contribution of chelation enhanced fluorescence (CHEF) and inhibition of intramolecular charge transfer (ICT). A 1:1 BPAM-Al(3+) complex confirmed by job's plot and HRMS with a binding constant of 6...
November 16, 2017: Journal of Fluorescence
Rostislav Bukasov, Olena Filchakova, Kristina Gudun, Mohamed Bouhrara
Strong surface (metal) enhanced fluorescence (SEF or MEF) is observed from clusters and single E coli bacteria cells labeled with Carbon nanodots (CDs), which were synthesized from date pits. The enhancement factor (EF) for SEF of the cell clusters were close to 50 for both 533 and 633 nm laser excitation wavelength. Those EFs are ratios of emission peak areas from CD labeled cell clusters on gold film to the peak areas of the same batch cell clusters on glass substrate. SEF with 633 nm excitation performed better than SEF with 532 nm excitation, achieving higher fluorescence intensity and much higher contrast...
November 10, 2017: Journal of Fluorescence
Reza Tabaraki, Negar Sadeghinejad, Ashraf Nateghi
Novel fluorescent carbon dots (CDs) for cobalt ions sensing were synthesized from 2,4,6-tris(2'-pyridyl)-s-triazine (TPTZ) and citric acid by microwave-assisted method in one pot. This sensor was water soluble, simple, sensitive and cheap. The size of the CDs was determined from transmission electron microscope image and was in the range of 10 nm. Under optimized experimental conditions, this luminescent system had stable response for Co (II) over a concentration range from 0.4 to 50 µM with a detection limit as low as 230 nM...
November 9, 2017: Journal of Fluorescence
Asma Iqbal, Naila Khalid, Humaira M Siddiqi, O Ok Park, Toheed Akhter
A series of fluorescent donor- acceptor (D-A) alternating copolyimides (P1, P2, P3 and P4) with 4-quinolin-8-yloxy linked triphenylamine main polymer chain have been synthesized by conventional polycondensation. All the synthesized co-polyimides were characterized by elemental, gel permeation chromatography and FTIR spectral analysis. These newly prepared PIs possess HOMO energy levels in range of - 4.74 to - 4.78 eV and have medium optical band gaps. The photoluminescence spectral analysis revealed blue to violet emission with appreciable efficiency with lower onset oxidation potentials suitable for the facile hole injection materials...
November 7, 2017: Journal of Fluorescence
Chunxi Zhao, Yang Jiao, Jianhao Hua, Jian Yang, Yaling Yang
Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized though a facile, economical and straightforward hydrothermal method by using polyacrylamide as both carbon and nitrogen sources. The as-prepared N-CQDs offered high quantum yield of 23.1%, exhibited good water solubility and fluorescence properties. Moreover, the N-CQDs can be used as effective probes for sensitive and selective detection of dopamine. Fluorescence of N-CQDs was effectively quenched after the addition of dopamine owing to dopamine would be transformed into dopamine-quinone under alkaline conditions...
November 7, 2017: Journal of Fluorescence
A V Bobrov, S D Usoltsev, Yu S Marfin, E V Rumyantsev
Hybrid materials based on organically modified silica with immobilized boron-dipyrrins (BODIPY) dyes were obtained. Spectral characteristics of the dyes were measured during the matrix formation and in obtained materials. It was stated, that immobilization does not affect the character of the absorption and fluorescence spectra of the dye, but due to the effect of fluorescent molecular rotor observed for meso-substituted BODIPY, the fluorescent quantum yields were found to increase during the matrix sealing...
November 6, 2017: Journal of Fluorescence
Yufeng Chen, Kunlei Zhang, Xiaoqing Wang, Fuliang Zheng
A group of binary ZnnEu-LDHs with Zn(2+)/Eu(3+) molar ratios of 5.0, 6.0, 7.0, and 8.0 have been obtained in ammonia water media by hydrothermal treatment. The structure, composition, and fluorescent property of samples have been investigated using various techniques. Compositional analyses revealed that the composition of samples was in agreement with that of the initial reactants. X-ray diffraction (XRD) suggested that the ZnnEu-LDHs exhibited typical layered structure with orthorhombic symmetry. All the ZnnEu-LDHs appeared strong red emissions attributed to (5)D0 → (7)F J (J = 1, 2) transitions of Eu(3+)...
November 6, 2017: Journal of Fluorescence
Yuan Cheng, Kangning Sun
Yb(3+),Er(3+),Eu(3+) triply-doped in YVO4 with varying molar ratio of Er/Eu were synthesized in a sol-gel method with a subsequent heat treatment for the first time. The optimal molar ratio of Er/Eu for the maximum energy transfer efficiency was 1/39. After molar ratio, the influences of different heat treatment temperatures were also researched and the maximal heat temperature was 1300 °C. Besides, the properties of YVO4:Yb(3+),Er(3+),Eu(3+) upconversion phosphors were investigated by X-ray diffraction, scanning electron microscopy and photo luminescent spectra, respectively...
November 6, 2017: Journal of Fluorescence
Prasad G Mahajan, Nilam C Dige, Sonali B Suryawanshi, Dattatray K Dalavi, Avinash A Kamble, Dhanaji P Bhopate, Abhijit N Kadam, Vijay V Kondalkar, Govind B Kolekar, Shivajirao R Patil
The aqueous suspension of fluorescent nanoparticles were prepared by using 9-anthradehdye derivative (AH). The nanoparticles (AHNPs) were characterized using DLS-zeta sizer and SEM techniques. The photo physical properties of nanoparticles and precursor were measured and compared using UV-absorption spectroscopy, fluorescence spectroscopy and fluorescence lifetime studies. The significant overlap between fluorescence spectrum of AHNPs and excitation spectrum of Riboflavin (RF) led us to explore Fluorescence Resonance Energy Transfer (FRET) studies between AHNPs and RF in aqueous medium...
October 27, 2017: Journal of Fluorescence
Muhammad Saleem, Muhammad Rafiq, Muhammad Hanif, Muhammad Ashraf Shaheen, Sung-Yum Seo
The design and development of the fluorescence reporting molecules for the trace recognition of the metallic ions in the aqueous, mixed organic aqueous media, environmental specimen, living things e.g., body fluids, serum, urine etc is the evergreen research area. Among several methodologies utilized for these purposes, the fluorescent techniques have wonderful impact in the era of metal sensor development due to their acclamatory features of non-invasive detection process and appreciable sensitivity. The utilization of small organic molecules for the sensation of metallic ions through the fluorescent techniques harvested the wonderful results having some interesting features of chromogenic response on metal binding, robustness in the preparation and applicability to establish the metallic accumulation level inside the live cells via bioimaging studies...
October 24, 2017: Journal of Fluorescence
Sousan Rasouli, Amir-Masoud Arabi, Alireza Naeimi, Seyed-Masoud Hashemi
Nanoparticles of Europium oxide doped with Zinc oxide were synthesized via microwave-assisted combustion method. Citric acid as a simultaneous fuel and chelating agent and glycine as a fuel and mixture of these fuels were sleeted. X-Ray diffraction patterns (XRD) indicated the formation of ZnO structure with a few amount of Eu2O3 phase. Fourier transformation infra red (FTIR) spectra reveal the increase of ZnO4 bonds with glycine content of fuels mixture. Scanning electron microscope (SEM) images showed the conversion of nanosphere to spongy-like structure with respect to change of fuel mixtures from citric to glycine...
October 11, 2017: Journal of Fluorescence
Ramzi Fezai, Mohamed Rzaigui
The new organic-inorganic hybrid [5-Cl-2-(CH3)C6H3NH3]4H2P6O18 has been synthesized by the slow evaporation method. X-ray diffraction on a single crystal shows that this acidic cyclohexaphosphate crystallized in the monoclinic space group C 2/c with a = 33.89(11) Å, b = 9.16(16) Å, c = 13.68(3) Å, β = 91.35(2)°, V = 4244.9(19) Å(3) and Z = 4. (31)P MAS-NMR and (13)C CP/MAS-NMR results are in accordance with X-ray findings. Fluorescent study shows the blue photoluminescence. Furthermore, FT-IR analysis was studied and the complete vibrational assignments were done...
October 7, 2017: Journal of Fluorescence
Sibel Gülle, Seçil Çelik Erbaş, Ataç Uzel
The phenanthroimidazole derivatives are used in the drug industry in large scale. In this study four new phenanthroimidazole-imine derivatives were synthesized and their spectroscopic studies as well as their antioxidant behaviors were examined. Structural analyses were made by FT-IR, (1)H-NMR, (13)C-NMR, LC-MS spectroscopy techniques. UV-vis absorption and emission spectroscopy techniques have been used to determine the photophysical characteristics of four newly synthesized phenanthroimidazoles. The maximum absorption and emission wavelengths, molar extinction coefficients (ε), singlet energy levels (Es), Stokes' shift values (Δλ) of phenanthroimidazole-imine derivatives are given...
October 7, 2017: Journal of Fluorescence
Sadegh Salehzadeh, Farshid Hajibabaei, Neda Hosseinpour Moghadam, Samira Sharifinia, Sadegh Khazalpour, Reza Golbedaghi
In the present work, the interaction of Isoxsuprine (ISX) with Calf thymus DNA (ct-DNA) under physiological conditions (Tris-HCl buffer of pH 7.4) was investigated by using electronic absorption, circular dichroism, viscosity, electrochemical studies, fluorescence techniques, salt effect studies and computational studies. Competitive fluorimetric studies with Hoechst 33258 have shown that ISX exhibit the ability to displace the DNA-bound Hoechst 33258, indicating that it binds to ct-DNA in strong competition with Hoechst 33258 for the minor groove binding...
October 6, 2017: Journal of Fluorescence
Netaji K Desai, Prasad G Mahajan, Dhanaji P Bhopate, Dattatray K Dalavi, Avinash A Kamble, Anil H Gore, Tukaram D Dongale, Govind B Kolekar, Shivajirao R Patil
A simple solid state reaction technique was employed for the preparation of polycrystalline luminophors of p-terphenyl containing different amounts of perylene followed by spectral characterization techniques viz. XRD, SEM, TGA-DSC, UV-Visible spectroscopy, thermo-electrical conductivity, fluorescence spectroscopy, fluorescence life time spectroscopy and temperature dependent fluorescence. X-ray diffraction profiles of the doped p-terphenyl reveal well-defined and sharp peaks indicate homogeneity and crystallinity...
October 2, 2017: Journal of Fluorescence
Raja Lakshmanan, N C Shivaprakash, S Sindhu
A series of ruthenium (III) complexes of the formulae [Ru(4-Mephtpy)2]Cl3(1) [Ru(L 1 )], [Ru(3,4,5-tmphtpy)2]Cl3(2) [Ru(L 2 )], and [Ru(4-thptpy)2]Cl3(3) [Ru(L 3 )], (where L = terpy = 2.2':6'2″ terpyridine ligands) are synthesized. The complexes were characterized by elemental analyses, spectroscopic and electrochemical data. The density functional theory (DFT) outlines the geometric optimisation and electronic charge transition of these complexes. Photophysical studies describe that the luminescence of Ru(III) complexes is due to electronic transition between the energy levels of singly unoccupied molecular orbitals (SUMO) and singly occupied molecular orbitals (SOMO)...
September 27, 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
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
Hamideh Elmizadeh, Majid Soleimani, Farnoush Faridbod, Ghasem Rezanejade Bardajee
In this work, as a novel fluorescent nano-sensor, a ligand-capped CdTe QDs (CdTe-L QDs) was designed for the detection and quantification of Cu(2+) ions in environmental water samples. The synthesized QDs were characterized by transmission electron microscopy (TEM), thermo-gravimetric (TG) analysis, Fourier transform infrared (FTIR), UV-Vis spectrophotometry and fluorescence spectroscopy. Optical properties of the produced nanosensor were monitored by UV-Vis and fluorescence spectrophotometry. It was observed that fluorescence intensity of the produced nano-sensor selectively quenched by adding Cu(2+) ions in comparison to other metal ions tested...
November 2017: Journal of Fluorescence
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