https://commons.ru.ac.za/vital/access/manager/Index en-us 5 https://commons.ru.ac.za/vital/access/manager/Repository/vital:5620 Wed 12 May 2021 19:45:11 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:3796 Wed 12 May 2021 16:50:45 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:3949 Thu 13 May 2021 13:31:40 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:4554 SnPc>ZnPc. Triplet lifetimes of the GePc (168-340μs) are very similar to that of the ZnPc (197 - 366μs), but the triplet lifetimes of the SnPc are ten fold shorter (10 - 32μs ). Triplet quantum yields are higher for the GePc (0.20 - 0.50) and SnPc (0.08 - 0.45) than for the ZnPc (0.02 - 0.25). Fluorescence lifetimes of GePc ( 4.0 - 5.1 ns) are significantly longer than that of ZnPc (1.9 - 3.0 ns) and SnPc (0.2 - 0.4 ns). Fluorescence quantum yields decrease in the following order: GePc(0.21-0.31)>ZnPc(0.02-0.21)>SnPc(0.02- 0.06). Ring-substituted cobalt phthalocyanine complexes of the form CoPc(R)4 (R= NH2, N02, C(CH3)3, S03H and COOH) are compared for their catalytic activities towards the oxidation of cysteine. The potential for the electrocatalytic oxidation of cysteine is closely related to the Com/Co11 couple of the CoPc(R)4 complexes in acidic media and to the Con/Co1 couple in basic media. The catalytic current and the oxidation potential for cysteine are dependent on the pH of the solution, the potential becoming less positive and the currents increasing with increase in pH.]]> Thu 13 May 2021 06:41:11 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:2736 Thu 13 May 2021 00:12:18 SAST ]]>