Valence structure and magnetic interaction in MMX-type 1D complexes, A(4)[Pt2I(P2O5H2)(4)]center dot nH(2)O, studied by P-31 solid NMR

Citation
N. Kimura et al., Valence structure and magnetic interaction in MMX-type 1D complexes, A(4)[Pt2I(P2O5H2)(4)]center dot nH(2)O, studied by P-31 solid NMR, SYNTH METAL, 120(1-3), 2001, pp. 779-780
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SYNTHETIC METALS
ISSN journal
0379-6779 → ACNP
Volume
120
Issue
1-3
Year of publication
2001
Pages
779 - 780
Database
ISI
SICI code
0379-6779(20010315)120:1-3<779:VSAMII>2.0.ZU;2-H
Abstract
P-31 MAS-NMR spectra and spin-lattice relaxation time T-1 in solid were mea sured on A(4)[Pt2I(P2O5H2)(4)]. nH(2)O (A: Cs, Rb, K, Na and Li). Continuou s spectrum changes in both line and splitting widths were observed with cha nging the cation size and the number of crystalline water. Complexes with A : Cs (n=0) and Rb (n=2) afforded two kinds of P-31 resonance lines with che mical shifts close to those in the Pt3+ and Pt2+ monomer complexes indicati ng a mixed valence structure. On the other hand, complexes with A: Na (n=2) and Li (n=4) yielded a broad single line suggesting the formation of param agnetic Pt sites with an averaged valence of Pt2.5+. An analogous continuou s change was observed in P-31 T-1 in consistent with the above analysis. Th e observed spectra and T-1 depending on the cation size and the H2O number suggest valence fluctuation due to spin jumps in and between Pt-Pt units se nsitively influenced by crystal packings and hydrogen bonding.