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

Abstract

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]

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

“…Mathematical expressions, computational procedures, and interrogation zone dimensions are given elsewhere. [17][18][19]26,27 Every effort was made to work at solution absorbances below Acm -~ _< 0.95 ([prim -< 3.00) where the inner-filtering correction equation is valid. Secondary inner-filtering corrections were not necessary in the present study since nitromethane is "optically transparent" in most of these PAHs' emission ranges.…”

Luminescence behavior of tetraaza macrocylic nickel (II) complexes and non-linear Stern–Volmer quenching

“…The quenching of fluorescence exhibited by transition metal complexes [31,32] and organic compounds by nitroaromatics [33] as well as other nitro compounds [34] in different media has been reported. Similarly fluorescence quenching by nickel (II) macrocyclic complexes and emission spectral recognition of anion are also known [35,36].…”

Spectrofluorimetric determination of 4-chlorobiphenyl and Arochlor 1221 using the fluorescence quenching produced by cetylpyridinium bromide micellar medium

“…Other authors have studied the decrease in the fluorescence intensity in polycyclic aromatic hydrocarbons due to surfactants such as cetyltrimethylammonium bromide, sodium lauryl sulphate and polyoxyethylene 23-laurylether [17], as the result of anionic species [18][19][20], organic compounds [21][22][23] or nitrobenzene and nitromethane. In the last of these cases, there is scope for a greater qualitative and quantitative determination of complex mixtures of these compounds [24,25]. Tine and Aaron [26] studied the fluorescent inhibition produced in indol derivates by heavy metals.…”