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Coupling rates and kinetics of arenediazonium cations with couplers utilized in the diazo reprographic process
Author(s) -
Cox A.,
Goodman P. D.,
Kemp T. J.,
de Moira P. Pinot
Publication year - 1981
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550130109
Subject(s) - diazo , chemistry , ion , sulfonate , stoichiometry , coupling (piping) , kinetics , azo coupling , ionization , inorganic chemistry , photochemistry , medicinal chemistry , polymer chemistry , organic chemistry , sodium , mechanical engineering , physics , quantum mechanics , engineering
Abstract Stoichiometric and, in most cases, absolute rates of coupling of a series of m ‐ and p ‐substituted benzenediazonium ions with 2,3‐dihydroxynaphthalene‐6‐sulfonate ion (1) have been determined (i) at pH 5.6 (when one OH group is partly monoionized) and (ii) at pH 9.9 (when one OH group is completely ionized and the second slightly so). The rates at both pH values correlate with the σ + parameter (except for the most reactive ArN 2 +at pH 9.9) and the contributions of the two reactive forms of the coupler evaluated. Detailed pH dependences of the coupling rate of the p ‐chlorobenzenediazonium ion with (1) reveal a strong interaction between (1) and the borate ion, which strongly influences the coupling rate. Coupling rates have also been measured for both diazonium ions and couplers of importance in the diazo reprographic process.