Investigation of longitudinal 31P relaxation in metal selenophosphate compounds

Christian G. Canlas, Rajendra B. Muthukumaran, Mercouri G Kanatzidis, David P. Weliky

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Molten salt syntheses yield a rich variety of metal selenophosphate compounds which have a wide range of 31P T1 longitudinal relaxation times (20-3000 s). There is a qualitative positive correlation between squared dipolar couplings and 1/T1, suggesting that these interactions contribute to relaxation. However, two of the compounds, K 2CdP2Se6 and Rb2CdP 2Se6, have T1 which are significantly shorter than what is expected from dipolar couplings. The ESR spectra of these compounds show the presence of unpaired electrons which may accelerate the rate of 31P relaxation. The importance of relaxation in application of 31P NMR to these systems is demonstrated in analysis of the mixture of crystalline products formed in a Ag4P2Se6 synthesis. At short relaxation delays, the NMR intensities are non-quantitative and overestimate the concentration of an Ag7PSe6 impurity.

Original languageEnglish
Pages (from-to)110-122
Number of pages13
JournalSolid State Nuclear Magnetic Resonance
Volume24
Issue number2-3 SPEC.
DOIs
Publication statusPublished - Sep 2003

Fingerprint

metal compounds
Metals
Nuclear magnetic resonance
Relaxation time
Paramagnetic resonance
Molten materials
Salts
Impurities
Crystalline materials
nuclear magnetic resonance
Electrons
molten salts
synthesis
relaxation time
impurities
selenophosphate
products
electrons
interactions

Keywords

  • 31P
  • Couplings
  • Dipolar
  • ESR
  • Longitudinal
  • NMR
  • Paramagnetic
  • Relaxation
  • Selenophosphates
  • T1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Electronic, Optical and Magnetic Materials

Cite this

Investigation of longitudinal 31P relaxation in metal selenophosphate compounds. / Canlas, Christian G.; Muthukumaran, Rajendra B.; Kanatzidis, Mercouri G; Weliky, David P.

In: Solid State Nuclear Magnetic Resonance, Vol. 24, No. 2-3 SPEC., 09.2003, p. 110-122.

Research output: Contribution to journalArticle

Canlas, Christian G. ; Muthukumaran, Rajendra B. ; Kanatzidis, Mercouri G ; Weliky, David P. / Investigation of longitudinal 31P relaxation in metal selenophosphate compounds. In: Solid State Nuclear Magnetic Resonance. 2003 ; Vol. 24, No. 2-3 SPEC. pp. 110-122.
@article{6efb87aad68b41edb68a6989b1171888,
title = "Investigation of longitudinal 31P relaxation in metal selenophosphate compounds",
abstract = "Molten salt syntheses yield a rich variety of metal selenophosphate compounds which have a wide range of 31P T1 longitudinal relaxation times (20-3000 s). There is a qualitative positive correlation between squared dipolar couplings and 1/T1, suggesting that these interactions contribute to relaxation. However, two of the compounds, K 2CdP2Se6 and Rb2CdP 2Se6, have T1 which are significantly shorter than what is expected from dipolar couplings. The ESR spectra of these compounds show the presence of unpaired electrons which may accelerate the rate of 31P relaxation. The importance of relaxation in application of 31P NMR to these systems is demonstrated in analysis of the mixture of crystalline products formed in a Ag4P2Se6 synthesis. At short relaxation delays, the NMR intensities are non-quantitative and overestimate the concentration of an Ag7PSe6 impurity.",
keywords = "31P, Couplings, Dipolar, ESR, Longitudinal, NMR, Paramagnetic, Relaxation, Selenophosphates, T1",
author = "Canlas, {Christian G.} and Muthukumaran, {Rajendra B.} and Kanatzidis, {Mercouri G} and Weliky, {David P.}",
year = "2003",
month = "9",
doi = "10.1016/S0926-2040(03)00047-X",
language = "English",
volume = "24",
pages = "110--122",
journal = "Solid State Nuclear Magnetic Resonance",
issn = "0926-2040",
publisher = "Elsevier",
number = "2-3 SPEC.",

}

TY - JOUR

T1 - Investigation of longitudinal 31P relaxation in metal selenophosphate compounds

AU - Canlas, Christian G.

AU - Muthukumaran, Rajendra B.

AU - Kanatzidis, Mercouri G

AU - Weliky, David P.

PY - 2003/9

Y1 - 2003/9

N2 - Molten salt syntheses yield a rich variety of metal selenophosphate compounds which have a wide range of 31P T1 longitudinal relaxation times (20-3000 s). There is a qualitative positive correlation between squared dipolar couplings and 1/T1, suggesting that these interactions contribute to relaxation. However, two of the compounds, K 2CdP2Se6 and Rb2CdP 2Se6, have T1 which are significantly shorter than what is expected from dipolar couplings. The ESR spectra of these compounds show the presence of unpaired electrons which may accelerate the rate of 31P relaxation. The importance of relaxation in application of 31P NMR to these systems is demonstrated in analysis of the mixture of crystalline products formed in a Ag4P2Se6 synthesis. At short relaxation delays, the NMR intensities are non-quantitative and overestimate the concentration of an Ag7PSe6 impurity.

AB - Molten salt syntheses yield a rich variety of metal selenophosphate compounds which have a wide range of 31P T1 longitudinal relaxation times (20-3000 s). There is a qualitative positive correlation between squared dipolar couplings and 1/T1, suggesting that these interactions contribute to relaxation. However, two of the compounds, K 2CdP2Se6 and Rb2CdP 2Se6, have T1 which are significantly shorter than what is expected from dipolar couplings. The ESR spectra of these compounds show the presence of unpaired electrons which may accelerate the rate of 31P relaxation. The importance of relaxation in application of 31P NMR to these systems is demonstrated in analysis of the mixture of crystalline products formed in a Ag4P2Se6 synthesis. At short relaxation delays, the NMR intensities are non-quantitative and overestimate the concentration of an Ag7PSe6 impurity.

KW - 31P

KW - Couplings

KW - Dipolar

KW - ESR

KW - Longitudinal

KW - NMR

KW - Paramagnetic

KW - Relaxation

KW - Selenophosphates

KW - T1

UR - http://www.scopus.com/inward/record.url?scp=0042389578&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042389578&partnerID=8YFLogxK

U2 - 10.1016/S0926-2040(03)00047-X

DO - 10.1016/S0926-2040(03)00047-X

M3 - Article

VL - 24

SP - 110

EP - 122

JO - Solid State Nuclear Magnetic Resonance

JF - Solid State Nuclear Magnetic Resonance

SN - 0926-2040

IS - 2-3 SPEC.

ER -