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Journal of Fluorescence

Anthony G Jay, James A Hamilton
Membrane organization and fluidity research continues to expand and the understanding of membrane dynamics continues to be refined. Within this field of study, laurdan remains among the most popular, versatile, and established fluorescence probes. Fluorimetry and multiphoton microscopy techniques are standards for measuring laurdan fluorescence and continue to be refined. However, complications have arisen due to an amended membrane model, revised terms used for describing membrane phases, and wide variation in the selection of laurdan generalized polarization equation values...
October 13, 2016: Journal of Fluorescence
Xialin Lu, Fangdi Wei, Guanhong Xu, Yanzi Wu, Jing Yang, Qin Hu
In this paper, a selective and sensitive sensor for the determination of p-aminophenol (PAP) was developed by grafting molecularly imprinted polymers (MIPs) on the surface of silica-coated CdTe quantum dots (CdTe@SiO2@MIPs). The obtained CdTe@SiO2@MIPs were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and fluorescence spectroscopy. The fluorescence intensity of CdTe@SiO2@MIPs was more strongly quenched by PAP than that of the structural analogues of PAP...
October 13, 2016: Journal of Fluorescence
Veikko Uahengo, Yan Zhang, Bi Xiong, Pingping Zhao, Ping Cai, Lydia Rhyman, Ponnadurai Ramasami, Kai Hu, Gongzhen Cheng
The 2,2'-dinaphtholazobenzene molecular framework (P) was designed, synthesized and characterized. Its absorption and fluorescence properties revealed that P is a dual sensor for copper ions (Cu(2+)) and fluoride ions (F(-)) in DMSO. The colorimetric activities were clearly visible by naked eye upon the addition of the two ions. Fluorescence quenching and enhancement were observed when Cu(2+) and F(-) ions were added respectively. Density Functional Theory (DFT) calculations were carried out to provide an insight into the interaction of guest ions (Cu(2+) and F(-)) with P, and to explain how the molecular orbitals were affected...
October 11, 2016: Journal of Fluorescence
Dan Yan, Yu He, Yili Ge, Gongwu Song
A novel fluorescence method for sensitive and selective detection of phosphate was developed based on near infrared emission Ag2S QDs/ Metal - Organic Shell Composite via the deposition of metal-organic (zinc-nitrogen) coordination shell around Ag2S QDs . Under optimal conditions described, the fluorescence intensity of the composite was decreased at 685 nm in the presence of phosphate, which was linearly related to the concentration of phosphate in the range of 0. 7 to 4.2 μM and 11.2 to 88.2 μM with the relative correlation coefficient of R(2) = 0...
October 10, 2016: Journal of Fluorescence
Xiangrong Li, Yunhui Yan
L-Ascorbic acid, α-tocopherol, procyanidin B3, β-carotene and astaxanthin are five classic dietary antioxidants. In this study, the interaction between the five antioxidants and ovalbumin was investigated by fluorescence spectroscopy, in combination with UV-vis absorption spectroscopy and circular dichroism (CD) spectroscopy. The quenching mechanism of ovalbumin by α-tocopherol is static quenching and the interaction between α-tocopherol and ovalbumin is synergistically driven by enthalpy and entropy. Electrostatic interactions and hydrophobic interactions play a major role in stabilizing the complex...
October 8, 2016: Journal of Fluorescence
Salman A Khan, Abdullah M Asiri, Faisal M S Aqlan
(2E)-3-[4-(dimethylamino)phenyl]-1-(2-hydroxyphenyl)prop-2-en-1-one (DPHP) was synthesized by the reaction 4(dimethylamino) benzaldehyde with 1-(2-hydroxyphenyl) ethanone under microwave irradiation. Structure of DPHP was conformed by (1)H and (13)C NMR, FT-IR, EI-MS spectral studies and elemental analysis. The electronic absorption and fluorescence spectra of DPHP have been studied in solvents of different polarities, and the data were used to study the solvatochromic properties such as extinction coefficient, stokes shift, oscillator strength, transition dipole moment, fluorescence quantum yield and photochemical quantum yield...
October 6, 2016: Journal of Fluorescence
Shuai Yuan, Fengyan Ge, Xue Yang, Shanyi Guang
A strategy for significantly enhancing fluorescence is developed based on the coupling of optical properties of colloidal photonic crystals (CPCs) with responsive microgel. In this paper, thermoresponsive microgel PNIPAM was employed for the fabrication of core-shell structure. The core-shell PS@PNIPAM nanoparticles (NPs) are then assembled to CPCs by a vertical deposition method. Subsequently, the novel functional material (RhB/CPCs) can be prepared by depositing fluorescent dye molecules (RhB) on the top of PS@PNIPAM CPCs...
October 5, 2016: Journal of Fluorescence
Rifat Akbar, Minati Baral, B K Kanungo
Photophysical properties of a multidentate tripodal ligand, 5,5'-(2-(((8-hydroxyquinolin-5-yl) methylamino)methyl)-2-methylpropane-1,3-diyl) bis (azanediyl)bis (methylene)diquinolin-8-ol, (TAME5OX), with La(3+) and Er(3+) ions have been examined for photonics applications. The change in behavior in electronic spectra of these complexes reveals the use of TAME5OX as a sensitive optical pH based sensor to detect Ln(3+) ions whereas indication of strong green fluorescence allows simultaneous sensing within the visible region in competitive medium...
October 4, 2016: Journal of Fluorescence
Rekha Kumari, Anitha Varghese, Louis George
Absorption and fluorescence studies on novel Schiff bases (E)-4-(4-(4-nitro benzylideneamino)benzyl)oxazolidin-2-one (NBOA) and (E)-4-(4-(4-chlorobenzylidene amino)benzyl)oxazolidin-2-one (CBOA) were recorded in a series of twelve solvents upon increasing polarity at room temperature. Large Stokes shift indicates bathochromic fluorescence band for both the molecules. The photoluminescence properties of Schiff bases containing electron withdrawing and donating substituents were analyzed. Intramolecular charge transfer behavior can be studied based on the influence of different substituents in Schiff bases...
October 4, 2016: Journal of Fluorescence
V Violet Dhayabaran, T Daniel Prakash, R Renganathan, Elsa Friehs, Detlef W Bahnemann
Novel bioactive complexes of Co(II), Cu(II), Ni(II) and Zn(II) metal ions with Schiff base ligand derived from histidine and 1,3-indandione were synthesized and thoroughly characterized by various analytical and spectral techniques. The biological investigations were carried out to examine the efficiency of the binding interaction of all the complexes with calf thymus DNA (CT-DNA). The binding properties were studied and evaluated quantitatively by Kb and Ksq values using UV-visible, fluorescence spectroscopy and voltammetric techniques...
October 1, 2016: Journal of Fluorescence
Philippe Babilotte
Among the several aspects involved into the synthesis of monocharged nitrogene-vacancy N V (-) colored centers produced into nanodiamonds ND, the post-annealing cleaning process, such as sulfo-nitric acid cleaning or thermal oxidation under acid conditions, can be seen as a factor impacting the optical response of these N V (-) colored centers. A significative difference of optical response is in fact noticed modifying the post-annealing treatment conditions, between a pure oxidative treatment at room temperature and a mixed-process including oxidation and thermal activation...
September 30, 2016: Journal of Fluorescence
Jigna R Bhamore, Sanjay Jha, Rakesh Kumar Singhal, Suresh Kumar Kailasa
In this work, water dispersible fluorescent carbon nanocrystals (NCs) were synthesized by a simple, green and low cost hydrothermal method using Syzygium cumini (jamun) as a carbon source at 180 °C for 6 h. The average size of carbon NCs was found to be 2.1 ± 0.5 nm and shown bright blue fluorescence when excited at 365 nm under UV lamp. The carbon NCs were characterized by spectroscopic (UV-visible and fluorescence, Fourier transform infrared and dynamic light scattering) and high resolution transmission electron microscopic techniques...
September 29, 2016: Journal of Fluorescence
Guan-Yeow Yeap, Elango Hrishikesan, Yi-Huan Chan, Wan Ahmad Kamil Mahmood
A new chalcone-based probe containing coumarin and naphthol at both ends has been synthesized via aldol condensation. The uniqueness of the newly derived probe can be ascribed to the presence of naphthol and coumarin units acting as binding site and signaling element, respectively. The fluorogenic behaviors toward various anions were investigated. The probe was characterized by various spectroscopic techniques and the in-depth study led to show excellent selectivity and sensitivity for fluoride ions. The hydrogen bonding thus formed with fluoride anion provides remarkable fluorometric responses...
September 28, 2016: Journal of Fluorescence
Vaibhavkumar N Mehta, Shiva Shankaran Chettiar, Jigna R Bhamore, Suresh Kumar Kailasa, Ramesh M Patel
In this work, highly luminescent carbon dots (CDs) were synthesized by the hydrothermal method at 170 °C for 12 h using pasteurized milk as a carbon source. The prepared CDs exhibited bright blue fluorescence under UV light illumination at 365 nm. The CDs show fluorescence life time of ~4.89 ns at excitation wavelength of 370 nm. The effect of different solvents on the fluorescence property of CDs was also investigated. The lisinopril (Lis)-loaded CDs were fabricated by self-assembly of lisinopril on the surfaces of CDs, which were characterized by UV-visible and FT-IR spectroscopic techniques...
September 28, 2016: Journal of Fluorescence
Ghulam Shabir, Aamer Saeed, Muhammad Arshad, Muhammad Zahid
In the present paper a novel way of symmetric conjugation extension along molecular axes of perylene dianhydride chromophore has been devised to achieve lengthy delocalized electronic species exhibiting red shifted absorption and emission of UV-Visible radiations. During synthetic pathway free amino Schiff bases of novel aldehydes with 4-amino acetanilide have been condensed with perylene dianhydride in quinoline at high temperature. Bis perylene diimide Schiff bases (5a-e) have been synthesized which showed absorption λmax at 461-526 nm and emission at 525-550 nm...
September 27, 2016: Journal of Fluorescence
Amy M Wagner, Sarah A Strohecker, Elizabeth K Costello, Jeffrey A Rood, Kristi A Kneas
Osmium transition metal complexes are of particular interest in luminescence-based sensing applications because of their longer wavelength absorptions and emissions, relative to similar ruthenium and rhenium complexes, that allow for inexpensive excitation and minimize interferences from autofluorescence when the sensor is used in biological samples. Reported here are the photophysical properties of a series of water-soluble osmium complexes suitable for use in hydrogel-based sensors: [Os(bpy)2(sulf-dpp)]Cl2, [Os(phen)2(sulf-dpp)]Cl2, [Os(dpp)2(sulf-dpp)]Cl2, and [Os(CO)2Cl2(sulf-dpp)], where bpy is 2,2'-bipyridine, phen is 1,10-phenanthroline, dpp is 4,7-diphenyl-1,10-phenanthroline, and sulf-dpp is bathophenanthrolinedisulfonic acid disodium salt...
September 23, 2016: Journal of Fluorescence
S Sureshkumar, B Jothimani, T M Sridhar, Arul Santhosh, B Venkatachalapathy
Surface modified ZnO nanomaterial is widely used in the field of bioimaging worldwide due to its optical properties, electronic characteristics and biocompatibility. Fluorescent enhanced, Polyquaternium-7(PQ7) capped, ZnO hexagonal nano disks (ZnO-PQ7) were synthesised by simple wet chemical method. The structural and optical properties of ZnO-PQ7 hexagonal nano disks were characterized using XRD, UV-Visible, Fluorescence, HRTEM, EDAX and FTIR studies. The size of synthesised ZnO-PQ7 were around 30-45 nm as confirmed by HRTEM studies...
September 20, 2016: Journal of Fluorescence
Jie Tang, Lijiang Lei, Hui Feng, Hongman Zhang, Yuwang Han
In the present study, we reported a convenient route to prepare well dispersed and functionalized K(+)-doped core-shell upconversion nanoparticles (UCP) by layer-by-layer (LbL) assembly of polyelectrolytes. UCP was firstly transferred to aqueous phase using cationic surfactant cetyl trimethyl ammonium bromide (CTAB) via hydrophobic interaction without removing the existing oleic acid (OA). Then the positively charged hydrophilic UCP@CTAB was further alternately deposited with negatively charged [poly (sodium 4-styrenesulfonate)] (PSS), positively charged [poly (allylamine hydrochloride)] (PAH) and negatively charged [poly (acrylic acid)] (PAA)...
September 20, 2016: Journal of Fluorescence
Muhammad Saleem, Muhammad Rafiq, Muhammad Hanif
Due to the deleterious effects of mercury on human health and natural ecosystems, high reactivity, non-degradability, extreme volatility and relative water and tissue solubility, it would consider as one of the most toxic environmental pollutants among the transition metals. In the present investigation, we have tried to summarized the several organic material based fluorescent sensor including rhodamine, boron-dipyrromethene (BODIPYs), thiourea, crown-ether, coumarine, squaraines, pyrene, imidazole, triazole, anthracene, dansyl, naphthalenedimide/ naphthalene/ naphthalimide, naphthyridine, iridium (III) complexes, polymeric materials, cyclodextrin, phthalic anhydride, indole, calix [4]arene, chromenone, 1,8-naphthalimides, lysine, styrylindolium, phenothiazine, thiocarbonyl quinacridone, oxadiazole, triphenylamine-triazines, tetraphenylethene, peptidyl and semicarbazone for the trace mercury detection in the aqueous, aqueous-organic and cellular media...
September 19, 2016: Journal of Fluorescence
Poonam Nandal, S P Khatkar, Rajesh Kumar, Avni Khatkar, V B Taxak
Synthesis and photoluminescence behaviour of six novel europium complexes with novel β-hydroxyketone ligand, 2-(4-chlorophenyl)-1-(2-hydroxy-4-methoxyphenyl)ethan-1-one (CHME) and 2,2'-bipyridine (bipy) or neocuproine (neo) or 1,10-phenanthroline (phen) or 5,6-dimethyl-1,10-phenanthroline (dmphen) or bathophenanthroline (bathophen) were reported in solid state. The free ligand CHME and europium complexes, Eu(CHME)3.2H2O [1] Eu(CHME)3.bipy [2], Eu(CHME)3.neo [3], Eu(CHME)3.phen [4], Eu(CHME)3.dmphen [5] and Eu(CHME)3...
September 19, 2016: Journal of Fluorescence
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