In:
Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 80, No. 4 ( 2002-04-01), p. 379-387
Abstract:
The hydrolyis or the aquation reactions of compounds of the types cis- and trans-Pt(Ypy) 2 (NO 3 ) 2 (Ypy = pyridine derivative) were studied in D 2 O and characterized by multinuclear ( 195 Pt, 13 C, and 1 H) NMR spectroscopy. In acidic pD, the product of the cis complexes is cis-[Pt(Ypy) 2 (D 2 O) 2 ] 2+ , whereas in basic medium cis-Pt(Ypy) 2 (OD) 2 is formed. The 195 Pt NMR resonances of the products containing ligands with an ortho substituent were observed at lower fields than the other complexes. The average coupling constant ( 3 J( 195 Pt 1 H) and 3 J( 195 Pt 13 C)) is 44 Hz for the diaqua species and 42 Hz for the dihydroxo compounds. At neutral pD, several hydrolyzed species were observed, except for the 2-picoline and 2,4-lutidine complexes, which contained only one compound, cis-[Pt(Ypy) 2 (D 2 O)(OD)] + . The other hydrolyzed products for the ligands with no ortho substituent were identified as the dihydroxo-bridged dimer, the monohydroxo-bridged dimer, the trimer, and possibly the tetramer. The trans analogues have shown two signals in acidic pD corresponding to the diaqua monomer and the monohydroxo-bridged aqua dimer. Two species (the dihydroxo compound and the monohydroxo-bridged hydroxo dimer) were also observed in basic pD. In neutral medium, a third signal assigned to a longer chain hydroxo-bridged oligomer or polymer was detected.Key words: platinum, pyridine derivative, nitrato, hydrolysis, NMR, aquation.
Type of Medium:
Online Resource
ISSN:
0008-4042
,
1480-3291
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2002
detail.hit.zdb_id:
1482256-8
