Thermally Induced Bi(III) Lone Pair Stereoactivity: Ferroelectric Phase Transition and Semiconducting Properties of (MV)BiBr5 (MV = methylviologen)

被引：161

作者：

Bi, Wenhua ^{[1
]}

Leblanc, Nicolas ^{[1
]}

Mercier, Nicolas ^{[1
]}

Auban-Senzier, Pascale ^{[2
]}

Pasquier, Claude ^{[2
]}

机构：

[1] Univ Angers, CNRS, Lab Chim & Ingn Mol Angers, UMR 6200, F-49045 Angers, France

[2] Univ Paris 11, CNRS, Phys Solides Lab, UMR 8502, F-91405 Paris, France

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 18期

关键词：

CRYSTAL-STRUCTURE; MAGNETIC-PROPERTIES; CHARGE-TRANSFER; BAND-GAP; IODIDE; TRANSPORT; COMPOUND; DICATION; CHAINS; TIN;

D O I：

10.1021/cm9016003

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：

Thermally induced Bi(III) lone pair stereoactivity, ferroelectric phase transition and semiconducting properties of (MV) BiBr5 was synthesized with X-ray single crystal structures and electrical and dielectric properties. The stereochemical activation of the lone pair is correlated with an increase of the band gap, as determined from conductivity measurements and interestingly with the transfer from a para- to a ferroelectric phase. The methylviologen dications are embedded between polymeric anions where Br interactions occur in the molecular plane and perpendicular to it, respectively and reported a correlation between the band gap or the conductivity of hybrids and the lone pair stereochemical activity. The results reported that MV 2+ cations have stabilized unprecedented regular BiBr5 chains of trans connected octahedra, that is further correlated with an increase of the band gap and with a para- to a ferroelectric phase transition.

引用

页码：4099 / 4101

页数：3

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