Molecular fluorescence

2021 ◽  
Author(s):  
David L Andrews ◽  
Robert H Lipson
Keyword(s):  
Molecular Fluorescence

Fluorescence of BODIPY Dyes in Gas Phase at near Ambient Conditions

2020 ◽  
Author(s):  
Kseniya A. Mariewskaya ◽  
Denis Larkin ◽  
Yuri Samoilichenko ◽  
Vladimir Korshun ◽  
Alex Ustinov
Keyword(s):  
Gas Phase ◽  
Molecular Interactions ◽  
Atmospheric Pressure ◽  
Fluorescence Spectra ◽  
Visible Range ◽  
Intrinsic Properties ◽  
Ambient Conditions ◽  
Ideal Model ◽  
Molecular Fluorescence ◽  
Tesla Coil

Molecular fluorescence is a phenomenon that is usually observed in condensed phase. It is strongly affected by molecular interactions. The study of fluorescence spectra in the gas phase can provide a nearly-ideal model for the evaluation of intrinsic properties of the fluorophores. Unfortunately, most conventional fluorophores are not volatile enough to allow study of their fluorescence in the gas phase. Here we report very bright gas phase fluorescence of simple BODIPY dyes that can be readily observed at atmospheric pressure using conventional fluorescence instrumentation. To our knowledge, this is the first example of visible range gas phase fluorescence at near ambient conditions. Evaporation of the dye in vacuum allowed us to demonstrate organic molecular electroluminescence in gas discharge excited by electric field produced by a Tesla coil.

scholarly journals Evaluation of N-Alkyl-bis-o-aminobenzamide Receptors for the Determination and Separation of Metal Ions by Fluorescence, UV-Visible Spectrometry and Zeta Potential

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1737 ◽  
Author(s):  
Marisela Martinez-Quiroz ◽  
Xiomara E. Aguilar-Martinez ◽  
Mercedes T. Oropeza-Guzman ◽  
Ricardo Valdez ◽  
Eduardo A. Lopez-Maldonado
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Metal Ions ◽  
Environmental Concern ◽  
Separation Of Metal Ions ◽  
Complexing Capacity ◽  
Alkyl Groups ◽  
Molecular Fluorescence ◽  
Uv Visible ◽  
Phase Sensor

This paper presents the synthesis and evaluation of physicochemical behavior of a new series of N-alkyl-bis-o-aminobenzamides (BOABs) in aqueous solution. The study was targeted to the complexing capacity of five metal ions (Fe2+, Cu2+, Cd2+, Hg2+ and Pb2+) of environmental concern as the medullar principle of a liquid phase sensor for its application in the determination of these metal ions due to its versatility of use. Molecular fluorescence, UV-visible and Zeta potential were measured for five BOABs and the effect of alkyl groups with different central chain length (n = 3, 4, 6, 8 and 10) on physicochemical performance determined. The results have shown that these derivatives present higher sensibility and selectivity for Cu2+ even in the presence of the other metal ions. An additional application test was done adding a pectin (0.1 wt %) solution to the BOAB-Cu+2 complex to obtain a precipitate (flocs) as a potential selective separation process of Cu from aqueous solution. The solid was then lyophilized and analyzed by SEM-EDS, the images showed spheric forms containing Cu+2 with diameter of approximately of 8 μm and 30 wt %.

Size-Selective Synthesis and Stabilization of Gold Organosol in CnTAC:  Enhanced Molecular Fluorescence from Gold-Bound Fluorophores

2005 ◽  
Vol 109 (27) ◽  
pp. 13166-13174 ◽  
Author(s):  
Snigdhamayee Praharaj ◽  
Sujit Kumar Ghosh ◽  
Sudip Nath ◽  
Subrata Kundu ◽  
Sudipa Panigrahi ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Molecular Fluorescence

scholarly journals Intersystem crossing rates of single perylene molecules in ortho-dichlorobenzene

2016 ◽  
Vol 18 (26) ◽  
pp. 17655-17659 ◽  
Author(s):  
Nico R. Verhart ◽  
Pedro Navarro ◽  
Sanli Faez ◽  
Michel Orrit
Keyword(s):  
Optical Switching ◽  
Intersystem Crossing ◽  
Triplet States ◽  
Spin States ◽  
Molecular Fluorescence

Triplet states can be interesting for optical switching of molecular fluorescence as well as quantum experiments relying on the manipulation of spin states.

scholarly journals OPTIMIZATION OF SAMPLE PREPARATION FOR THE DETERMINATION OF HPA'S VISION IN A GEOMETRIC TECHNIQUE USING MOLECULAR FLUORESCENCE

2012 ◽  
Vol 09 (18) ◽  
pp. 65-70
Author(s):  
Andréa Francisca Fernandes BARBOSA ◽  
Dayanne Chianca MOURA ◽  
Fabiana Roberta Gonsalves da Silva HUSSEIN ◽  
Jailson Vieira MELO ◽  
Djalma Ribeiro SILVA
Keyword(s):  
Sample Preparation ◽  
Solvent System ◽  
Optimum Conditions ◽  
23 Factorial Design ◽  
Essential Step ◽  
Analysis Process ◽  
The Matrix ◽  
Molecular Fluorescence ◽  
Geometric Technique

The sample preparation is considered an essential step in the analysis process. The complexity of the matrix and how the compounds are linked is one of the main difficulties in the extraction. Thus a solvent system combined with an extraction method, both need to be effective against such mishaps. In this work we used the 23 factorial design to determine the optimum conditions for sample preparation. The analysis of the samples were performed in a molecular fluorescence spectrophotometer. The factors selected to investigate the influence on the extraction system were: time of use of ultrasound, the type of solvent (hexane or dichloromethane) and ratio solvent / sample (1:1 and 1:3). The best result was obtained with using the dichloromethane in time of 10 min of ultrasound and the ratio solvent / sample 1:3.

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