scholarly journals Spectroscopic Investigation of Fluorescence Quenching Agents. Part II: Effect of Nitromethane on the Fluorescence Emission Behavior of Thirty-Six Alternant Benzenoid Polycyclic Aromatic Hydrocarbons

1992 ◽  
Vol 46 (8) ◽  
pp. 1260-1265 ◽  
Author(s):  
Sheryl A. Tucker ◽  
Hardjanti Darmodjo ◽  
William E. Acree ◽  
John C. Fetzer ◽  
Maximilian Zander
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Aromatic Hydrocarbons ◽  
Spectroscopic Investigation ◽  
Fluorescence Probe ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Polycyclic Aromatic ◽  
Emission Behavior ◽  
Emission Intensity Ratio

Nitromethane is examined as a selective quenching agent for discriminating between “alternant” versus “nonalternant” polycyclic aromatic hydrocarbons in unknown mixtures. Of the 36 benzenoid solutes studied, only dibenzo[hi,wx]heptaphene failed to obey the selective quenching rule. Also reported are new experimental fluorescence probe studies for dibenzo[de,st]pentacene, dibenzo[fg,qr]pentacene, naphtho[8,1,2hij)-hexaphene, benzo[vwx]hexaphene, benzo[1,2,3cd;4,5,6c'd‘]diperylene, dibenzo[hi,wx]heptacene, benzo[b]triphenylene, chrysense, and anthracene dissolved in nonelectrolyte solvents of varying polarity. Benzo-[vwx]hexaphene was found to exhibit probe character, as evidenced by a systematic variation in emission intensity ratio with solvent polarity.

scholarly journals Spectroscopic Investigation of Fluorescence Quenching Agents: Effect of Nitromethane on the Fluorescence Emission Behavior of Select Cyclopenta-PAH, Aceanthrylene, and Fluorene Derivatives

1992 ◽  
Vol 46 (7) ◽  
pp. 1156-1161 ◽  
Author(s):  
Vicki L. Amszi ◽  
Yvonne Cordero ◽  
Bradley Smith ◽  
Sheryl A. Tucker ◽  
William E. Acree ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Aromatic Hydrocarbons ◽  
Spectroscopic Investigation ◽  
Fluorescence Emission ◽  
Complete Agreement ◽  
Solvent Mixtures ◽  
Aqueous Acetonitrile ◽  
Polycyclic Aromatic ◽  
Emission Behavior

Nitromethane is examined as a selective fluorescence quenching agent for “alternant” alkyl-substituted polycyclic aromatic hydrocarbons (PAHs). Fluorescence emission behavior is reported for 11 H-benz[bc]aceanthrylene, 4 H-cyclopenta[def]phenanthrene, 4 H-cyclopenta[def]chrysene, 13 H-dibenzo[a,g]fluorene, 13 H-dibenzo[a,i]fluorene, 4 H-benzo[b]cyclopenta[mno]chrysene, 4 H-cyclopenta[pqr]picene, 7 H-dibenzo[c,g]fluorene, 9 H-benz(6,7)indeno[1,21]phenanthrene, 4 H-benzo[b]cyclopenta[jkl]triphenylene, 13 H-dibenz[bc,k]aceanthrylene, 13 H-dibenz[bc,l]aceanthrylene, and 4 H-benzo[def]cyclopenta[mno]chrysene dissolved in organic solvents of varying polarity and in acetonitrile or aqueous-acetonitrile solvent mixtures at various nitromethane concentrations. Results of these measurements show that nitromethane quenches fluorescence emission of the thirteen solutes studied, which is in complete agreement with what would be expected on the basis of the fact that all solutes are “alternant” polycyclic aromatic hydrocarbons.

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 Spectroscopic Properties of Polycyclic Aromatic Hydrocarbons: Effect of Solvent Polarity on the Fluorescence Emission Behavior of Select Fluoranthene, Fluorenochrysene, Indenochrysene, and Indenopyrene Derivatives

1991 ◽  
Vol 45 (10) ◽  
pp. 1699-1705 ◽  
Author(s):  
Sheryl A. Tucker ◽  
William E. Acree ◽  
Bongsup P. Cho ◽  
Ronald G. Harvey ◽  
John C. Fetzer
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Spectroscopic Properties ◽  
Effect Of Solvent ◽  
Polycyclic Aromatic ◽  
Organic Nonelectrolyte ◽  
Emission Behavior ◽  
Intensity Ratios

Fluorescence emission behavior is reported for benz[def]indeno-[1,2,3hi]chrysene, fluoreno[2,3,4,9defg]chrysene, benz[def]indeno-[l,2,3qr]chrysene, dibenzo[a,e]fluoranthene, indeno[1,2,3cd]pyrene, naphtho[1,2b]fluoranthene, benzo[b]fluoranthene, fluoranthene, benzo-[ghi]fluoranthene, naphtho[2,1a]fluoranthene, naphtho[2,3b]fiuoranthene, benzo[k]fluoranthene, and benzo[j]fluoranthene dissolved in organic nonelectrolyte solvents of varying polarity. Results of these measurements are used to classify the various solutes as either probe or nonprobe molecules, depending upon whether measured emission intensity ratios vary systematically with solvent polarity. Also discussed are primary and secondary inner-filtering artifacts associated with selective quenching agents used to help identify/analyze polycyclic aromatic hydrocarbons (PAHs) in unknown mixtures. Inner-filtering artifacts are illustrated by examining fluorescence emission intensities of 13 “nonalternant” PAHs at different nitromethane concentrations and solution absorbances.

scholarly journals Spectroscopic Investigation of Fluorescence Quenching Agents. Part IV: Selectivity of Nitromethane for Discriminating between Alternant versus Nonalternant Polycyclic Aromatic Hydrocarbons in Solvents of Differing Polarities

1993 ◽  
Vol 47 (11) ◽  
pp. 1775-1779 ◽  
Author(s):  
Sheryl A. Tucker ◽  
Heather C. Bates ◽  
William E. Acree ◽  
John C. Fetzer
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Aromatic Hydrocarbons ◽  
Hplc Analysis ◽  
Fluorescence Emission ◽  
Solvent Mixture ◽  
Solvent Mixtures ◽  
Aqueous Acetonitrile ◽  
Polycyclic Aromatic ◽  
Emission Behavior

To further assess the applicability of nitromethane as a selective quenching agent for alternant vs. nonalternant polycyclic aromatic hydrocarbons in HPLC analysis, we measured the effect that it has on the fluorescence emission behavior of 96 different polycyclic aromatic hydrocarbons dissolved in a binary ethyl acetate/acetonitrile solvent mixture. Nitromethane quenching results are compared with previously reported acetonitrile, aqueous/acetonitrile, and toluene/acetonitrile solvent mixtures. Results of these measurements revealed that the “selective quenching” rule is obeyed for the vast majority of PAHs in all solvents considered thus far, with the coronene derivatives being the only major exceptions.

On the Fluorescence Quenching of Polycyclic Aromatic Hydrocarbons by Nitromethane

1975 ◽  
Vol 30 (10) ◽  
pp. 1311-1314 ◽  
Author(s):  
H. Dreeskamp ◽  
E. Koch ◽  
M. Zander
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Aromatic Hydrocarbons ◽  
High Energy ◽  
Dynamic Quenching ◽  
Quenching Mechanism ◽  
Polycyclic Aromatic ◽  
Acetonitrile Solutions ◽  
Alternant Hydrocarbons

Abstract Fluorescence quenching of 22 polycyclic aromatic hydrocarbons by nitromethane in toluene and acetonitrile solutions has been studied. Contrary to Sawicki’s observations that the fluorescence of hydrocarbons with the fluoranthene skeleton is not quenched that of 11.12-and 3.4-benzofluor-anthene and fluoranthene itself is quenched. These compounds have a high energy of the fluorescence transition. The fluorescence quenching of the compounds investigated follows a dynamic quenching mechanism. The bimolecular rate constant of fluorescence quenching increases exponentially with the energy of the fluorescing state of alternant hydrocarbons.

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