Electric field gradient modulation and nuclear magnetic relaxation in hexacyanocobaltate ion

V. P. Chacko, R. G. Bryant

Research output: Contribution to journalArticle

Abstract

The 59Co, 15N, and 13C NMR relaxation rates are reported for potassium hexacyanocobaltate in aqueous solutions as a function of temperature and counter ion. The 59Co relaxation rate is dominated by the nuclear electric quadrupole relaxation mechanism, but measurements of the 13C and 15N relaxation rates show that modulation of the electric field gradient at the cobalt nucleus is not coupled to rotation of the symmetrical complex ion. The field gradient change at the cobalt nucleus resulting from ion-pair formation with magnesium ion is on the order of or less than 30%. This observation supports the hypothesis that larger changes in the relaxation rate of the central ion are due to perturbations in the first-coordination sphere of the observed ion.

Original languageEnglish (US)
Pages (from-to)79-84
Number of pages6
JournalJournal of Magnetic Resonance (1969)
Volume57
Issue number1
DOIs
StatePublished - 1984
Externally publishedYes

Fingerprint

magnetic relaxation
modulation
gradients
electric fields
ions
cobalt
nuclei
magnesium
potassium
counters
quadrupoles
aqueous solutions
perturbation
nuclear magnetic resonance

Cite this

Electric field gradient modulation and nuclear magnetic relaxation in hexacyanocobaltate ion. / Chacko, V. P.; Bryant, R. G.

In: Journal of Magnetic Resonance (1969), Vol. 57, No. 1, 1984, p. 79-84.

Research output: Contribution to journalArticle

@article{4bb2d249cdcc464fa7c580d7de4160a3,
title = "Electric field gradient modulation and nuclear magnetic relaxation in hexacyanocobaltate ion",
abstract = "The 59Co, 15N, and 13C NMR relaxation rates are reported for potassium hexacyanocobaltate in aqueous solutions as a function of temperature and counter ion. The 59Co relaxation rate is dominated by the nuclear electric quadrupole relaxation mechanism, but measurements of the 13C and 15N relaxation rates show that modulation of the electric field gradient at the cobalt nucleus is not coupled to rotation of the symmetrical complex ion. The field gradient change at the cobalt nucleus resulting from ion-pair formation with magnesium ion is on the order of or less than 30{\%}. This observation supports the hypothesis that larger changes in the relaxation rate of the central ion are due to perturbations in the first-coordination sphere of the observed ion.",
author = "Chacko, {V. P.} and Bryant, {R. G.}",
year = "1984",
doi = "10.1016/0022-2364(84)90235-X",
language = "English (US)",
volume = "57",
pages = "79--84",
journal = "Journal of Magnetic Resonance (1969)",
issn = "0022-2364",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Electric field gradient modulation and nuclear magnetic relaxation in hexacyanocobaltate ion

AU - Chacko, V. P.

AU - Bryant, R. G.

PY - 1984

Y1 - 1984

N2 - The 59Co, 15N, and 13C NMR relaxation rates are reported for potassium hexacyanocobaltate in aqueous solutions as a function of temperature and counter ion. The 59Co relaxation rate is dominated by the nuclear electric quadrupole relaxation mechanism, but measurements of the 13C and 15N relaxation rates show that modulation of the electric field gradient at the cobalt nucleus is not coupled to rotation of the symmetrical complex ion. The field gradient change at the cobalt nucleus resulting from ion-pair formation with magnesium ion is on the order of or less than 30%. This observation supports the hypothesis that larger changes in the relaxation rate of the central ion are due to perturbations in the first-coordination sphere of the observed ion.

AB - The 59Co, 15N, and 13C NMR relaxation rates are reported for potassium hexacyanocobaltate in aqueous solutions as a function of temperature and counter ion. The 59Co relaxation rate is dominated by the nuclear electric quadrupole relaxation mechanism, but measurements of the 13C and 15N relaxation rates show that modulation of the electric field gradient at the cobalt nucleus is not coupled to rotation of the symmetrical complex ion. The field gradient change at the cobalt nucleus resulting from ion-pair formation with magnesium ion is on the order of or less than 30%. This observation supports the hypothesis that larger changes in the relaxation rate of the central ion are due to perturbations in the first-coordination sphere of the observed ion.

UR - http://www.scopus.com/inward/record.url?scp=0005304148&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0005304148&partnerID=8YFLogxK

U2 - 10.1016/0022-2364(84)90235-X

DO - 10.1016/0022-2364(84)90235-X

M3 - Article

AN - SCOPUS:0005304148

VL - 57

SP - 79

EP - 84

JO - Journal of Magnetic Resonance (1969)

JF - Journal of Magnetic Resonance (1969)

SN - 0022-2364

IS - 1

ER -