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- W2020138762 abstract "In dimethyl sulphoxide (dmso) as solvent, the rate constant at 298·1 K for formation of the mono-complex of NiII ion with the unidentate ligand 4-phenylpyridine (kf= 1·64 × 103l mol–1 s–1) is ca. 24 and 63 times as large as corresponding values for the polydentate ligands 2,2′-bipyridine (bipy) and 2,2′,2″-terpyridine (terpy) respectively, and nearer to the solvent-exchange rate (kex= 7·4 × 103 s–1). These results are in marked contrast to values reported in aqueous solution where the rates of formation are about the same for py, bipy, and terpy, and a rate-determining chelate-ring-closure mechanism is postulated for the polydentate ligands in dmso. This postulate is supported by kinetic studies of the, HgII and H+ induced dissociations of the (2,2′-bipyridine)nickel(II) ion in dmso solution which indicate that, for 2,2′-bipyridine at 298·1 K, the rate of chelate-ring closure (rate constant krc) is ca. 60 times slower in dmso (krcca. 47 s–1) than in water (krcca. 3 × 103 s–1)." @default.
- W2020138762 created "2016-06-24" @default.
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- W2020138762 date "1973-01-01" @default.
- W2020138762 modified "2023-09-23" @default.
- W2020138762 title "Evidence for a rate-determining chelate-ring-closure mechanism during the formation of the (2,2′-bipyridine)nickel(<scp>II</scp>) ion in dimethyl sulphoxide solution" @default.
- W2020138762 doi "https://doi.org/10.1039/dt9730001602" @default.
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