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Thermally Induced Bi(III) Lone Pair Stereoactivity: Ferroelectric Phase Transition and Semiconducting Properties of (MV)BiBr 5 (MV= methylviologen)

2009; American Chemical Society; Volume: 21; Issue: 18 Linguagem: Inglês

10.1021/cm9016003

1520-5002

Wenhua Bi, Nicolas Leblanc, Nicolas Mercier, Pascale Auban‐Senzier, Claude Pasquier,

Acoustic Wave Resonator Technologies

Regular BiBr5 chains of trans-connected octahedra are stabilized by methyviologen cations. The Bi3+ electron lone pair is sterochemically activated below −30 °C, leading to an acentric polar phase, and this is correlated with an increase of the band gap, and with the transfer from a para- to a ferroelectric phase.