17O NMR Study of Solvent Exchange in Some Aqueous [Co(tren)(X)(OH2/OH)]n+, [Co(cyclen)(X)(OH2/OH)]n+, and [Co(N-Mecyclen)(X)(OH2/OH)]n+ Systems (X = NH3, OH2/OH; n = 3, 2, 1)1

Autor:	Charles R. Clark, D. A. Buckingham, Nicola E. Brasch, Andrew J. Rogers
Rok vydání:	1998
Předmět:	Inorganic Chemistry Solvent chemistry.chemical_compound Aqueous solution Cyclen Stereochemistry Chemistry Physical and Theoretical Chemistry Medicinal chemistry Ion
Zdroj:	Inorganic Chemistry. 37:4865-4871
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic980221u
Popis:	A 17O NMR study (I = 1.0 M, NaClO4 or NaOSO2CF3, 25.0 °C) of solvent exchange in labeled p- and t-[Co(tren)(NH3)OH2]3+, [Co(tren)(OH2)2]3+, [Co(cyclen)(OH2)2]3+, and [Co(N-Mecyclen)(OH2)2]3+ ions (ca. 30% 17O) in aqueous solution has shown that loss of coordinated OH2 is slow for all of the complexes (kex/s-1 = 1.1 × 10-5, 1.2 × 10-5, 3.7 × 10-5 (p-site)/8.7 × 10-6 (t-site), 2 × 10-4, and 2 × 10-4, respectively). Values of kex for solvent exchange in [Co(tren)(OH)2]+ have been determined as 9.7 × 10-5 s-1 (p-site) and 2.2 × 10-7 s-1 (t-site) Coordinated OH- in both p- and t-[Co(tren)(NH3)OH]2+ also exchanges only slowly with solvent (kex/s-1= 1.7 × 10-4, and
Databáze:	OpenAIRE
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