207Pb NMR of minium, Pb3O4:: evidence for the [Pb2]4+ ion and possible relativistic effects in the Pb-Pb bond

被引：15
|
作者：
Gabuda, SP
Kozlova, SG
Terskikh, VV
Dybowski, C [1 ]
Neue, G
Perry, DL
机构：
[1] Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA
[2] Inst Inorgan Chem, Novosibirsk 630090, Russia
[3] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[4] Univ Dortmund, D-44221 Dortmund, Germany
[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
来源：
SOLID STATE NUCLEAR MAGNETIC RESONANCE | 1999年 / 15卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
Pb-207; NMR; Pb3O4;
D O I：
10.1016/S0926-2040(99)00038-7
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：
Solid Pb3O4 has been studied with Pb-207 nuclear magnetic resonance (NMR) spectroscopy. The Pb-207 NMR chemical-shift tensor of the Pb2+ site has principal values of delta(11) = 1980 +/- 5 ppm, delta(22) = 1540 +/- 5 ppm, and delta(33) = -1108 +/- 10 ppm; delta(iso) = 804 +/- 10 ppm. The chemical-shift tensor of the Pb4+ site is axial, with principal values delta(11) = -1009 +/- 3 ppm and delta(perpendicular to) = 1132 +/- 3 ppm; delta(iso) = -1091 +/- 3 ppm. The Pb4+-Pb2+ scalar coupling constant J(Pb-Pb) = 2.3 +/- 0.1 kHz. The main contribution to the Pb2+ chemical-shift anisotropy is proposed to arise from an exchange interaction in the Pb2+-Pb2+ pairs, conventionally regarded as molecular [Pb-2](4+) ions. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：103 / 107
页数：5
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