Synthesis and Photoproperties of Fluorescent Brighteners Modified by Polyaminamide

2011 ◽  
Vol 233-235 ◽  
pp. 3064-3067
Author(s):  
Jing Liu ◽  
Guang Hua Zhang
Keyword(s):  
Condensation Reaction ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Molecular Structures ◽  
Paper Coating ◽  
Fluorescence Emission Spectra ◽  
Coating Application ◽  
Light Stability ◽  
Photochemical Properties

One of amino compounds of traditional fluorescent brighteners with polyaminamide was replaced and new triazinyl aminostilbene fluorescent brightener was modified by polyaminamide which synthesized through three-step condensation reaction. The molecular structures were characterized by IR spectrum and photoproperties in aqueous and ethanol were studied by ultraviolet absorption spectra, fluorescence emission spectra, photochemical stability and paper coating application test. The results show that the light stability and fluorescence quantum yield of polyaminamide fluorescent brighteners (PFBs) were improved obviously, which compared with the traditional FBs, such as VBL, and the whitening performance of paper coating enhanced and used widely. Meanwhile, the photophysics and photochemical properties of triazene-stilbene fluorescence brighteners are markedly determined by solvent polarity.

scholarly journals A Coumarin-Based Fluorescence Probe for Selective Recognition of Cu2+ Ions and Live Cell Imaging

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Guangjie He ◽  
Nana Ma ◽  
Linlin Li ◽  
Chenyan Xie ◽  
Linlin Yang ◽  
...  
Keyword(s):  
Live Cell Imaging ◽  
Density Functional ◽  
Fluorescence Probe ◽  
Limit Of Detection ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescence Emission Spectra ◽  
Functional Theory ◽  
Photochemical Properties ◽  
Fluorescence Titrations

A new fluorescence probe L was rationally designed and synthesized for the recognition of Cu2+ ions by the combination of coumarin hydrazide and 2-acetylpyrazine. The photochemical properties and selectivity of L for Cu2+ ions in a CH3CN/HEPES (3 : 2, v/v) buffer were investigated by UV-vis absorption and fluorescence emission spectra. A highly selective and sensitive response of L for Cu2+ ions over other competing metal ions was observed with limit of detection in 3 μM. The coordination stoichiometry of L to Cu2+ ions was determined to be 1 : 1 by the UV-vis absorption spectrum, the fluorescence titrations, and density functional theory (DFT) calculations. Moreover, L was applied successfully for recognition of intracellular Cu2+ ions in living cells.

scholarly journals Polycyclic Aromatic Nitrogen Heterocycles. Part IV: Effect of Solvent Polarity, Solvent Acidity, Nitromethane and 1,2,4-Trimethoxybenzene on the Fluorescence Emission Behavior of Select Monoaza- and Diazaarenes

1992 ◽  
Vol 46 (11) ◽  
pp. 1630-1635 ◽  
Author(s):  
Sheryl A. Tucker ◽  
Hardjanti Darmodjo ◽  
William E. Acree ◽  
Maximilian Zander ◽  
Erich C. Meister ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Fluorescence Emission Spectra ◽  
Effect Of Solvent ◽  
Polycyclic Aromatic ◽  
Organic Nonelectrolyte ◽  
Emission Behavior ◽  
Intensity Ratios ◽  
Solvent Acidity

Fluorescence emission spectra are reported for naphth[2′l′8′7′: 4,10,5]anthra[l,9,8cdef]cinnoline, benzo[lmn][3,8]phenanthroline (also called 2,7-diazapyrene), benz[4,10]anthra[l,9,8cdef]cinnoline, naphtho[8,1,2hij]pyreno[9,10,ldef]phthalazine, acenaphtho[l,2b]pyridine, benzo[a]phenazine, indeno[l,2,3ij][2,7]naphthyridine, and indeno-[l,2,3ij]isoquinoline dissolved in organic nonelectrolyte solvents of varying polarity and acidity. Results of these measurements indicate that naphth[2′,1′,8′,7′:4,10,5]anthra[l,9,8cdef]cinnoline exhibits some signs of probe character as evidenced by changing emission intensity ratios; however, numerical values did not vary systematically with solvent polarity. The effect of nitromethane and 1,2,4-trimethoxybenzene as selective quenching agents on both the unprotonated and protonated PANHs was also examined. Nitromethane was found to quench fluorescence emission of roughly two-thirds of the alternant unprotonated PANHs studied to date. Emission intensities of the protonated PANHs remained essentially constant and were not affected by nitromethane. 1,2,4-Trimethoxybenzene, on the other hand, quenched the fluorescence emission of several unprotonated and all protonated PANHs examined.

Polycyclic Aromatic Hydrocarbon Solute Probes. Part X: Evaluation of Select Hydrogenated Pyrene, Benzo[ghi]perylene, and Naphthacene Derivatives as Possible Solvent Polarity Probes

1993 ◽  
Vol 47 (7) ◽  
pp. 1040-1045 ◽  
Author(s):  
Sheryl A. Tucker ◽  
William E. Acree ◽  
John C. Fetzer ◽  
Reginald H. Mitchell
Keyword(s):  
Dynamic Range ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Measured Intensity ◽  
Fluorescence Emission Spectra ◽  
Mathematical Expressions ◽  
Polycyclic Aromatic ◽  
Organic Nonelectrolyte ◽  
High Fluorescence

Fluorescence emission spectra are reported for 3,4,5-trihydrobenzo[cd]pyrene, 3,4-dihydrobenzo[ghi]perylene, 5,6,7,8,9,10-hexahydrobenzo[ghi]perylene, trans-10b,10c-dihydro-10b,10c-dimethylpyrene, trans-12b,12c-dihydro-12b,12c-dimethylbenzo[a]pyrene, and trans-14b,14c-dihydro-14b,14c-dimethylnaphtho[2,1,8-qra]naphthacene dissolved in organic nonelectrolyte solvents of varying polarity. Dihydrobenzo|ghi]perylene was found to exhibit probe character, as evidenced by a systematic variation in emission intensity ratio with solvent polarity. It has a dynamic range of 0.98 and a high fluorescence quantum yield and is thought to be noncarcinogenic. Also reported are mathematical expressions which correlate measured intensity ratios and solvent polarity probe behavior of dihydrobenzo[ghi]perylene, pyrene, benzo[ghi]perylene, coronene, and ovalene in 48 solvents of varying polarity.

scholarly journals Spectroscopic Investigation of Fluorescence Quenching Agents. Part III: Effect of Solvent Polarity on the Selectivity of Nitromethane for Discriminating between Alternant versus Nonalternant Polycyclic Aromatic Hydrocarbons

1993 ◽  
Vol 47 (6) ◽  
pp. 715-722 ◽  
Author(s):  
Sheryl A. Tucker ◽  
William E. Acree ◽  
John C. Fetzer ◽  
Ronald G. Harvey ◽  
Mary J. Tanga ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Solvent Mixtures ◽  
Fluorescence Emission Spectra ◽  
Polycyclic Aromatic ◽  
Organic Nonelectrolyte ◽  
Emission Behavior

To better assess the applicability of nitromethane as a selective quenching agent for alternant versus nonalternant polycyclic aromatic hydrocarbons in HPLC, TLC, and HPTLC analysis, we measured the effect that it has on the fluorescence emission behavior of 96 different polycyclic aromatic hydrocarbons dissolved in binary toluene/acetonitrile solvent mixtures. Results of these measurements revealed that the “selective quenching” rule is obeyed for the vast majority of PAHs, with the coronene derivatives being the only major exceptions. Fluorescence emission spectra are also reported for benzo[g]chrysene, naphtho[2,3g]chrysene, 4 H-benzo[c]cyclopenta[mno]chrysene, dibenzo[ghi,mno]fluoranthene (commonly called corannulene), rubicene, diacenaphtho[l,2j:l‘,2'l]fluoranthene, 10-methyl-benzo[b]fluoranthene, 3-methoxybenzo[k]fluoranthene, and 3-hydroxybenzo[k]fluoranthene in organic nonelectrolyte solvents of varying polarity. Calculated emission intensity ratios failed to vary systematically with solvent polarity, and all nine of the aforementioned solutes were thus classified as nonprobe molecules.

scholarly journals Exploring the optoelectronic properties of a chromene-appended pyrimidone derivative for photovoltaic applications

2019 ◽  
Vol 17 (1) ◽  
pp. 1167-1172
Author(s):  
Mohammed A. Assiri
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Frontier Molecular Orbital ◽  
Electronic Effects ◽  
Fluorescence Emission Spectra ◽  
Functional Theory

AbstractIn the present study, a chromene-appended pyrimidone derivative (PBA) has been synthesized in order to account for the relationship between chemical structure and charge transport properties. The optical properties of PBA were studied in different solvents; it displays a weak emission profile in polar protic solvents but is highly emissive in polar aprotic solvents. Quantum chemical approaches on this molecule were performed in detail to highlight the importance of and to better understand the structural and electronic effects of introducing substituted pyrimidone rings in a polyaromatic molecule to support the development of new optoelectronic and photovoltaic devices. We shed light on the frontier molecular orbital, electron injection, electronic coupling constant, light harvesting efficiency, and photophysical properties of PBA by using density functional theory and time domain density functional theory. The absorption spectra (λa) and fluorescence emission spectra (λf) were computed in different solvents (Methanol, Ethanol, Butanol, Hexane, Chloroform and DMF) at the TD-B3LYP/6-31G** and TD-PBE/6-31G** levels of theory, and it was determined that the TD-B3LYP/6-31G** level is more accurate in the reproduction of experimental λa and λf in various solvents. Furthermore, no significant effect was observed on the λa and λf by changing the solvent polarity.

Solvatochromic and pH Switch Properties of a D–π–A Dye with benzo[b]thiophene as Donor Moiety

2021 ◽  
Author(s):  
Lili Feng ◽  
Pengyu Wang ◽  
Hansen Yang ◽  
Zhuo Chen ◽  
Shuhui Bo
Keyword(s):  
Color Change ◽  
Condensation Reaction ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Polar Solvents ◽  
Fluorescence Emission Spectra ◽  
Knoevenagel Condensation Reaction ◽  
A Charge ◽  
Donor Moiety ◽  
Positive Solvatochromism

A charge transfer dye with the D–[Formula: see text]–A structure was synthesized by Pd catalyzed Hartwig–Buchwald coupling and Knoevenagel condensation reaction, using N, N-dihexylbenzo[b]thiophen-6-amine as donor and 2-(3-cyano-4, 5, 5-trimethylfuran-2 (5H)-ylidene)malononitrile (TCF) as acceptor. The solvatochromic and pH switch properties of the as-synthesized dye were investigated through UV-vis absorption and fluorescence emission spectra. A positive solvatochromism of the dye in different polar solvents was observed along with a visible color change of the solution. By adding acid/base into the DMSO solution of the dye, the color as well as the absorption and emission spectra of the solution exhibited outstanding characteristics of pH switch.

Optical Properties and Zinc Nitride Thin Films Prepared Using Magnetron Reactive Sputtering

2014 ◽  
Vol 940 ◽  
pp. 11-15
Author(s):  
Jun Qin Feng ◽  
Jun Fang Chen
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Near Infrared ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Sem Images ◽  
Fluorescence Emission Spectra ◽  
Glass Substrates ◽  
Zinc Nitride ◽  
Direct Band

Zinc nitride films were deposited by ion sources-assisted magnetron sputtering with the use of Zn target (99.99% purity) on 7059 glass substrates. The films were characterized by XRD, SEM and EDS, the results of which show that the polycrystalline zinc nitride thin film can be grown on the glass substrates, the EDS spectrum confirmed the chemical composition of the films and the SEM images revealed that the zinc nitride thin films have a dense structure. Ultraviolet-visible-near infrared spectrophotometer was used to study the transmittance behaviors of zinc nitride thin films, which calculated the optical band gap by Davis Mott model. The results of the fluorescence emission spectra show the zinc nitride would be a direct band gap semiconductor material.

Stress and Phase Transformation Phenomena in Oxide Films: Real-Time Spectroscopic Measurements

1992 ◽  
Vol 271 ◽  
Author(s):  
Gregory J. Exarhos ◽  
Nancy J. Hess
Keyword(s):  
Phase Transformation ◽  
Applied Pressure ◽  
Oxide Films ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Film Deposition ◽  
Optical Methods ◽  
Fluorescence Emission Spectra ◽  
Line Intensities ◽  
Deposition Parameters

ABSTRACTIn situ optical methods are reviewed for characterization of phase transformation processes and evaluation of residual stress in solution-deposited metastable oxide films. Such low density films most often are deposited as disordered phases making them prone to crystallization and attendant densification when subjected to increased temperature and/or applied pressure. Inherent stress imparted during film deposition and its evolution during the transformation are evaluated from phonon frequency shifts seen in Raman spectra (TiO2) or from changes in the laser-induced fluorescence emission spectra for films containing rare earth (Sm+3:Y3Al5O12) or transition metal (Cr+3 :Al2O3) dopants. The data in combination with measured increases in line intensities intrinsic to the evolving phase are used to follow crystallization processes in thin films. In general, film deposition parameters are found to influence the crystallite ingrowth kinetics and the magnitude of stress and stress relaxation in the film during the transformation. The utility of these methods to probe crystallization phenomena in oxide films will be addressed.

scholarly journals Fluorescence emission spectra of silver and silver/cobalt nanoparticles

2012 ◽  
Vol 19 (3) ◽  
pp. 943-947 ◽  
Author(s):  
Z. Parang ◽  
A. Keshavarz ◽  
S. Farahi ◽  
S.M. Elahi ◽  
M. Ghoranneviss ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Emission Spectra ◽  
Cobalt Nanoparticles ◽  
Fluorescence Emission Spectra
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