PULSE-RADIOLYSIS OF BENZIDINE IN AQUEOUS-SOLUTIONS

被引:7
作者
DEY, GR
NAIK, DB
KISHORE, K
MOORTHY, PN
机构
[1] Applied Chemistry Division, Bhabha Atomic Research Centre, Bombay, 400085, Trombay
来源
RADIATION PHYSICS AND CHEMISTRY | 1994年 / 43卷 / 05期
关键词
Aqueous solutions - Chemical reactions - Free radicals - Oxidation - Physical chemistry - Solutions;
D O I
10.1016/0969-806X(94)90065-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
OH radicals react with benzidine, to give initially adducts, with rate constants of 1.5 x 10(10) and 2.5 x 10(9) dm(3) mol(-1) s(-1) at pHs 7 and 2, respectively, which later give rise to a cation radical (H(2)NR(2)NH(2)(+)) and its protonated form (H(2)NR(2)NH(3)(2+)). At pH 13, O- radicals react with benzidine by H-abstraction with a rate constant of 2.5 x 10(9) dm(3) mol(-1) s(-1) to give anilino type of radical (H(2)NR(2)NH'). Besides the reported bands viz. 455 nm for the cation radical and 380 nm for the 4(4'-aminophenyl)anilino radical, new bands with maxima around 780 and 620 nm were observed for the cation radical and anilino type radical respectively. Similar transient spectra were obtained by the reaction of one electron oxidants also. The cation radical was found to oxidise ascorbate ions with a rate constant of 1 x 10(8) dm(3) mol(-1) s(-1). e(aq)(-) reaction with benzidine (k = 2.1 x 10(9) dm(3) mol(-1) s(-1)) leads to elimination of ammonia and gives a transient species with lambda(max) at 390 nm. H-atoms react by addition (k = 1.3 x 10(9) dm(3) mol(-1) s(-1)) with benzidine to give a species having weak absorption in the UV region with lambda(max) at 360 nm.
引用
收藏
页码:481 / 485
页数:5
相关论文
共 9 条
[1]   THE AZIDE RADICAL AND ITS REACTION WITH TRYPTOPHAN AND TYROSINE [J].
BUTLER, J ;
LAND, EJ ;
SWALLOW, AJ ;
PRUTZ, W .
RADIATION PHYSICS AND CHEMISTRY, 1984, 23 (1-2) :265-270
[2]   PULSE RADIOLYSIS OF AQUEOUS-SOLUTIONS OF ANILINE AND SUBSTITUTED ANILINES [J].
CHRISTENSEN, H .
INTERNATIONAL JOURNAL FOR RADIATION PHYSICS AND CHEMISTRY, 1972, 4 (03) :311-+
[3]  
GUHA SN, 1987, P INDIAN AS-CHEM SCI, V99, P261
[4]  
GUPTA SP, 1991, INDIAN J CHEM B, V30, P122
[5]  
JOSEPHY PD, 1986, FED PROC, V45, P2465
[6]  
PERRIN DD, 1965, DISSOCIATION CONSTAN, P120
[7]  
RAHIMTULA AD, 1985, CHEM-BIOL INTERACT, V54, P143
[8]  
SOLAR S, 1986, RADIAT PHYS CHEM, V28, P229
[9]  
TRIPATHI GNR, 1988, RADIAT PHYS CHEM, V32, P251