207Pb NMR study of novel Pb-Pb chemical bonding in lead monoxides, α-PbO and β-PbO

被引：21

作者：

Gabuda, SP ^{[1
]}

Kozlova, SG

Terskikh, VV

Dybowski, C

Neue, G

Perry, DL

机构：

[1] Russian Acad Sci, Inst Organ Chem, Novosibirsk 630090, Russia

[2] Boreskov Inst Catalysis, Novosibirsk 630090, Russia

[3] Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA

[4] Univ Dortmund, D-44221 Dortmund, Germany

[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 305卷 / 5-6期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1016/S0009-2614(99)00407-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

alpha-PbO and beta-PbO have been studied with Pb-207 NMR-MAS spectroscopy in the solid state. The Pb-207 NMR chemical-shift tensor in alpha-PbO is axial, with principal values delta(perpendicular to) = 3030 +/- 5, delta(parallel to) = -270 +/- 5, and delta(iso) = 1930 +/- 10 ppm. In beta-PbO, the Pb-207 NMR powder spectrum is approximately represented by a single non-axial tensor with principal values delta(11) = 2820, delta(22) = 2760, delta(33) = -1000, delta(iso) = 1525 +/- 10 ppm and eta = 0.024, although there appears to be an overlap of two very similar patterns. Using normal-coordinate analysis, the Pb-207 magnetic shielding tensor is represented as a sum of contributions from separate Pb-O and Pb-Pb interactions. It is shown that Pb-O and Pb-Pb contributions are of the same order of magnitude. A potential underlying relativistic reason for the abnormal Pb-Pb interaction is revealed. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：353 / 358

页数：6

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