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Quenching of I( 2 P ½ ) by R‐OH compounds. Influence of the alkyl group on the quenching efficiency
Author(s) -
Chiappero Malisa S.,
Badini Raúl G.,
Argüello Gustavo A.
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:3<155::aid-kin1>3.0.co;2-t
Subject(s) - chemistry , quenching (fluorescence) , alkyl , group (periodic table) , analytical chemistry (journal) , reaction rate constant , crystallography , fluorescence , kinetics , organic chemistry , physics , quantum mechanics
The deactivation of I( 2 P ½ ) by R‐OH compounds (R = H, C n H 2n+1 ) was studied using time‐resolved atomic absorption at 206.2 nm. The second‐order quenching rate constants determined for H 2 O, CH 3 OH, C 2 H 5 OH, n ‐C 3 H 7 OH, i ‐C 3 H 7 OH, n ‐C 4 H 9 OH, i ‐C 4 H 9 OH, s ‐C 4 H 9 OH, t ‐C 4 H 9 OH, are respectively, 2.4 ± 0.3 × 10 −12 , 5.5 ± 0.8 × 10 −12 , 8 ± 1 × 10 −12 , 10 ± 1 × 10 −12 , 10 ± 1 × 10 −12 , 11.1 ± 0.9 × 10 −12 , 9.8 ± 0.9 × 10 −12 , 7.1 ± 0.7 × 10 −12 , and 4.1 ± 0.4× 10 −12 cm 3 molec −1 s −1 at room temperature. It is believed that a quasi‐resonant electronic to vibrational energy transfer mechanism accounts for most of the features of the quenching process. The influence of the alkyl group and its role in the total quenching rate is also discussed. © 1997 John Wiley & Sons, Inc.