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Effect of Positions of Methyl Substituents in the Complexation Kinetics of Macrocyclic Tetraamines with Copper(II) in Strongly Basic Aqueous Media
Author(s) -
Hu MonAi,
Chung ChungSun
Publication year - 1991
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199100074
Subject(s) - chemistry , kinetics , copper , aqueous solution , aqueous medium , reaction rate constant , stereochemistry , medicinal chemistry , polymer chemistry , organic chemistry , physics , quantum mechanics
The complexation kinetics of the reaction of copper(II) with isomeric tetraamine macrocyclic ligands, C‐rac‐5, 7, 7, 12, 12, 14‐hexamethyl‐l, 4, 8, 11‐tetraazacyclotetradecane (tet c), C‐meso‐5, 7, 7, 12, 12, 14‐hexamethyl‐l, 4, 8, 11‐tetraazacyclotetradecane (tet d), and C‐ meso ‐5, 5, 7, 12, 12, 14‐hexamethyl‐1, 4, 8, 11‐tetraazacyclotetradecane (tet a) in strongly basic aqueous media have been examined at 25.0 ± 0.1°C by means of the stopped‐flow technique. The variation in the values of the resulting rate constants indicates that the positions of the methyl substituents play a significant role in these reactions. These reactions exhibit associative character and second‐bond formation is proposed as the rate‐determining step.