In:
Applied Spectroscopy, SAGE Publications, Vol. 46, No. 11 ( 1992-11), p. 1630-1635
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
0003-7028
,
1943-3530
DOI:
10.1366/0003702924926952
Language:
English
Publisher:
SAGE Publications
Publication Date:
1992
detail.hit.zdb_id:
1474251-2
SSG:
11
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