Issue 31, 2020

Probing the structural and electronic response of Magnus green salt compounds [Pt(NH2R)4][PtCl4] (R = H, CH3) to pressure

Abstract

Despite possessing the desirable crystal packing and short Pt⋯Pt stacking distances required for a large piezoresistive response, the conductivity-pressure response of the Magnus green salt [Pt(NH3)4][PtCl4] is extremely sluggish. Through a combination of high-pressure X-ray diffraction and hybrid-DFT solid state calculations this study demonstrates that the poor conductivity-pressure response is due to a low volumetric compression anisotropy, a relatively large ambient pressure band gap and a lack of dispersion in the conduction band. Ligand modification (from NH3 to NH2CH3) does not enhance the piezoresistive response, causing even lower anisotropy of the volumetric compression and an unexpected phase transition at above 2 GPa. This study demonstrates that consideration of frontier band dispersion is a key design criterion, alongside crystal packing and Pt⋯Pt stacking distances, for piezoresistive materials.

Graphical abstract: Probing the structural and electronic response of Magnus green salt compounds [Pt(NH2R)4][PtCl4] (R = H, CH3) to pressure

Supplementary files

Article information

Article type
Paper
Submitted
18 Jun 2020
Accepted
24 Jul 2020
First published
24 Jul 2020
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2020,22, 17668-17676

Probing the structural and electronic response of Magnus green salt compounds [Pt(NH2R)4][PtCl4] (R = H, CH3) to pressure

J. G. Richardson, H. Benjamin, S. A. Moggach, L. R. Warren, M. R. Warren, D. R. Allan, L. K. Saunders, C. A. Morrison and N. Robertson, Phys. Chem. Chem. Phys., 2020, 22, 17668 DOI: 10.1039/D0CP03280H

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