Valence structure and magnetic interaction in MMX-type 1D complexes, A4[Pt2I(P2O5H2) 4]·nH2O, studied by 31P solid NMR

N. Kimura; S. Ishimaru; T. Kawashima; S. Miya; T. Manabe; M. Yamashita; R. Ikeda

doi:10.1016/S0379-6779(00)00866-3

Valence structure and magnetic interaction in MMX-type 1D complexes, A₄[Pt₂I(P₂O₅H₂) ₄]·nH₂O, studied by ³¹P solid NMR

N. Kimura, S. Ishimaru, T. Kawashima, S. Miya, T. Manabe, M. Yamashita, R. Ikeda

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

³¹P MAS-NMR spectra and spin-lattice relaxation time T₁ in solid were measured on A₄[Pt₂I(P₂O₅H₂) ₄]·nH₂O (A: Cs, Rb, K, Na and Li ). Continuous spectrum changes in both line and splitting widths were observed with changing the cation size and the number of crystalline water. Complexes with A: Cs (n=0) and Rb (n=2) afforded two kinds of ³¹P resonance lines with chemical shifts close to those in the Pt³⁺ and Pt²⁺ monomer complexes indicating 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 paramagnetic Pt sites with an averaged valence of Pt^2.5+. An analogous continuous change was observed in ³¹P T₁ in consistent with the above analysis. The observed spectra and T₁ depending on the cation size and the H₂O number suggest valence fluctuation due to spin jumps in and between Pt-Pt units sensitively influenced by crystal packings and hydrogen bonding.

Original language	English
Pages (from-to)	779-780
Number of pages	2
Journal	Synthetic Metals
Volume	120
Issue number	1-3
DOIs	https://doi.org/10.1016/S0379-6779(00)00866-3
Publication status	Published - 2001 Mar 15
Externally published	Yes

Keywords

Nuclear magnetic resonance spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0379-6779(00)00866-3

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Kimura, N., Ishimaru, S., Kawashima, T., Miya, S., Manabe, T., Yamashita, M., & Ikeda, R. (2001). Valence structure and magnetic interaction in MMX-type 1D complexes, A₄[Pt₂I(P₂O₅H₂) ₄]·nH₂O, studied by ³¹P solid NMR. Synthetic Metals, 120(1-3), 779-780. https://doi.org/10.1016/S0379-6779(00)00866-3

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title = "Valence structure and magnetic interaction in MMX-type 1D complexes, A4[Pt2I(P2O5H2) 4]·nH2O, studied by 31P solid NMR",

abstract = "31P MAS-NMR spectra and spin-lattice relaxation time T1 in solid were measured on A4[Pt2I(P2O5H2) 4]·nH2O (A: Cs, Rb, K, Na and Li ). Continuous spectrum changes in both line and splitting widths were observed with changing the cation size and the number of crystalline water. Complexes with A: Cs (n=0) and Rb (n=2) afforded two kinds of 31P resonance lines with chemical shifts close to those in the Pt3+ and Pt2+ monomer complexes indicating 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 paramagnetic Pt sites with an averaged valence of Pt2.5+. An analogous continuous change was observed in 31P T1 in consistent with the above analysis. The observed spectra and T1 depending on the cation size and the H2O number suggest valence fluctuation due to spin jumps in and between Pt-Pt units sensitively influenced by crystal packings and hydrogen bonding.",

keywords = "Nuclear magnetic resonance spectroscopy",

author = "N. Kimura and S. Ishimaru and T. Kawashima and S. Miya and T. Manabe and M. Yamashita and R. Ikeda",

year = "2001",

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day = "15",

doi = "10.1016/S0379-6779(00)00866-3",

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T1 - Valence structure and magnetic interaction in MMX-type 1D complexes, A4[Pt2I(P2O5H2) 4]·nH2O, studied by 31P solid NMR

AU - Kimura, N.

AU - Ishimaru, S.

AU - Kawashima, T.

AU - Miya, S.

AU - Manabe, T.

AU - Yamashita, M.

AU - Ikeda, R.

PY - 2001/3/15

Y1 - 2001/3/15

N2 - 31P MAS-NMR spectra and spin-lattice relaxation time T1 in solid were measured on A4[Pt2I(P2O5H2) 4]·nH2O (A: Cs, Rb, K, Na and Li ). Continuous spectrum changes in both line and splitting widths were observed with changing the cation size and the number of crystalline water. Complexes with A: Cs (n=0) and Rb (n=2) afforded two kinds of 31P resonance lines with chemical shifts close to those in the Pt3+ and Pt2+ monomer complexes indicating 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 paramagnetic Pt sites with an averaged valence of Pt2.5+. An analogous continuous change was observed in 31P T1 in consistent with the above analysis. The observed spectra and T1 depending on the cation size and the H2O number suggest valence fluctuation due to spin jumps in and between Pt-Pt units sensitively influenced by crystal packings and hydrogen bonding.

AB - 31P MAS-NMR spectra and spin-lattice relaxation time T1 in solid were measured on A4[Pt2I(P2O5H2) 4]·nH2O (A: Cs, Rb, K, Na and Li ). Continuous spectrum changes in both line and splitting widths were observed with changing the cation size and the number of crystalline water. Complexes with A: Cs (n=0) and Rb (n=2) afforded two kinds of 31P resonance lines with chemical shifts close to those in the Pt3+ and Pt2+ monomer complexes indicating 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 paramagnetic Pt sites with an averaged valence of Pt2.5+. An analogous continuous change was observed in 31P T1 in consistent with the above analysis. The observed spectra and T1 depending on the cation size and the H2O number suggest valence fluctuation due to spin jumps in and between Pt-Pt units sensitively influenced by crystal packings and hydrogen bonding.

KW - Nuclear magnetic resonance spectroscopy

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