Kinetics and simulations of reaction between safranine-O and acidic bromate and role of bromide therein
作者:S. B. Jonnalagadda、M. Shezi、N. R. Gollapalli
DOI:10.1002/kin.10084
日期:——
intricate kinetics during its reaction with bromate at low pH conditions. Under conditions of excess concentrations of acid and bromate, safranine-O (SA+) initially depleted very slowly (k = (3.9 ± 0.3) × 10−4 M−3 s−1) but after an induction time, the reaction occurred swiftly. Bromide exhibited a dual role in the reaction mechanism, both as an autocatalyst and as an inhibitor. The added bromide increased
Safranine-O 是一种吩嗪类染料,被发现在低 pH 条件下与溴酸盐反应过程中表现出复杂的动力学。在酸和溴酸盐浓度过高的条件下,番红-O (SA+) 最初消耗非常缓慢 (k = (3.9 ± 0.3) × 10-4 M-3 s-1),但在诱导时间后,反应迅速发生。溴化物在反应机理中表现出双重作用,既作为自催化剂又作为抑制剂。添加的溴化物增加了 SA+ 的初始消耗速率,但延迟了向快速反应的转变。发现总的化学计量反应是 6SA+ + 4 BrO3- = 6SP + 3N2O + 3H2O + 6H+ + 4Br-,其中 SP 是 3-amino-7-oxo-2,8-dimethyl-5-phenylphenazine。溴水溶液与番红-O 反应的快速动力学 (k = (2.2 ± 0. 1) × 103 M-1 s-1) 本文还报道了一种 17 步机制,与整体反应动力学一致并由模拟支持,并且还讨论了各种溴和氧溴物质的作用。©