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Lead(II) Chloride Ionic Liquids and organic/inorganic Hybrid Materials--A Study of chloroplumbate(II) Speciation

Lead(II) Chloride Ionic Liquids and organic/inorganic Hybrid Materials--A Study of chloroplumbate(II) Speciation

Fergal Coleman, Guo Feng, Richard W Murphy, Peter Nockemann, Kenneth R Seddon, Małgorzata Swadźba-Kwaśny

Dalton Trans. 2013 Apr 14;42(14):5025-35.

PMID: 23392355

Abstract:

A range of chloroplumbate(II) organic salts, based on the two cations, 1-ethyl-3-methylimidazolium and trihexyl(tetradecyl)phosphonium, was prepared by ionothermal synthesis. Depending on the structure of the organic cation and on the molar ratio of PbCl2 in the product, χPbCl2, the salts were room-temperature ionic liquids or crystalline organic/inorganic hybrid materials. The solids were studied using Raman spectroscopy; the crystal structure of [C2mim]{PbCl3} was determined and shown to contain 1D infinite chloroplumbate(II) strands formed by edge-sharing tetragonal pyramids of pentacoordinate (PbCl5) units. The liquids were analysed using (207)Pb NMR and Raman spectroscopies, as well as viscometry. Phase diagrams were constructed based on differential scanning calorimetry (DSC) measurements. Discrete anions: [PbCl4](2-) and [PbCl3](-), were detected in the liquid state. The trichloroplumbate(II) anion was shown to have a flexible structure due to the presence of a stereochemically-active lone pair. The relationship between the liquid phase anionic speciation and the structure of the corresponding crystalline products of ionothermal syntheses was discussed, and the data were compared with analogous tin(II) systems.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7758954	Lead(II) chloride		7758-95-4	Price

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