NMR spectra of iminobis(methylenephosphonic acid), HN(CH2PO3H2)2, and related ligands and of their complexes with platinum(II)

Appleton T.G., Hall J.R. and McMahon I.J. (1986) NMR spectra of iminobis(methylenephosphonic acid), HN(CH2PO3H2)2, and related ligands and of their complexes with platinum(II). Inorganic Chemistry, 25 6: 726-734.

Author Appleton T.G.
Hall J.R.
McMahon I.J.
Title NMR spectra of iminobis(methylenephosphonic acid), HN(CH2PO3H2)2, and related ligands and of their complexes with platinum(II)
Journal name Inorganic Chemistry   Check publisher's open access policy
ISSN 0020-1669
Publication date 1986-01-01
Sub-type Article (original research)
Volume 25
Issue 6
Start page 726
End page 734
Total pages 9
Subject 1604 Human Geography
Abstract Variations in chemical shift with pD have been studied for 31P, 1H, and 13C NMR with iminobis(methylenephosphonic acid) (idmpH4) and N-(phosphonomethyl)glycine (impaH3) and for 31P NMR with (methylimino)bis(methylenephosphonic acid) (midmpH4) and nitrilotris(methylenephosphonic acid) (ntmpH6) and discussed in terms of the successive deprotonation equilibria. 31P, 15N, 195Pt, and 13C NMR spectra have been used to study the reactions in solution of each of the ligands with cis-Pt-(15NH3)2(H2O) 2 2+. Under acid conditions, idmpH4, midmpH4, and ntmpH6 each initially coordinate through phosphonate O, with subsequent formation of a N,O-chelate. With impa, the chelate complex with carboxylate bound is stable in acid, and the isomer with phosphonate bound is stable in alkali. idmpH4 with PtCl4 2- in acid gives PtCl2(idmpH3-.N,O)-, which with base gives PtCl(idmp-N,O,O)3-, with the ligand coordinated meridional and tridentate. The N-methyl analogue behaves similarly. In acid, impa forms PtCl2(impaH2-N,O)-, with carboxylate oxygen bound. At higher pH, PtCl(impa-N,O,O)2- forms.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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