Effects of 2,4-ionenes of different molar masses on the oxidative coupling of thiol catalyzed by cobaltphthalocyanine

Content Provider	Semantic Scholar
Author	Streun, Karel H. Van Piet, P. German, Anton L.
Copyright Year	1987
Abstract	Abstract A photometric method is developed for the determination of the molar mass of 2,4-ionene by attaching a chromophoric moiety to its end-groups. Molar mass determination of these polyelectrolytes by acid-base titration of the amine end-groups is also possible, and confirms the photometric method. The effects of molar mass of 2,4-ionenes on the oxidative coupling of 2-mercaptoethanol (ME) was studied in the presence of cobalt(II)phthalocyanine-tetra-sodium-sulphonate (CoTSPc). Monomeric analogues of 2,4-ionene showed no increase of reaction rate as compared with the polymer-free system. However, relatively low molar mass ionene ( M n = 1740 ) showed a dramatic increase of reaction rate. The reactivity showed an optimum around pH = 8. Saturation kinetics (Michaelis-Menten kinetics) were observed. The calculated turnover number was 3200 sec−1 and 3600 sec−1 for M n = 6600 and M n = 1740 , respectively. The stoichiometry of the reaction was disturbed at low thiol concentration.
Starting Page	941
Ending Page	946
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1016/0014-3057(87)90037-1
Volume Number	23
Alternate Webpage(s)	https://pure.tue.nl/ws/portalfiles/portal/2435959/619755.pdf
Alternate Webpage(s)	https://pure.tue.nl/ws/files/2435959/619755.pdf
Alternate Webpage(s)	https://doi.org/10.1016/0014-3057%2887%2990037-1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article