Next Article in Journal / Special Issue
Magnetism of Molecular Conductors
Previous Article in Journal
Electronic Structures, and Optical and Magnetic Properties of Quadruple-Decker Phthalocyanines
Previous Article in Special Issue
Dye-Sensitized Molecular Charge Transfer Complexes: Magnetic and Conduction Properties in the Photoexcited States of Ni(dmit)2 Salts Containing Photosensitive Dyes
Article Menu

Export Article

Open AccessFeature PaperArticle
Magnetochemistry 2017, 3(2), 22; doi:10.3390/magnetochemistry3020022

The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds

1
Instituto de Telecomunicações, P-1049-001 Lisboa, Portugal
2
Chemical Engineering Department, ISEL, P-1959-007 Lisboa, Portugal
3
C2TN-Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, P-2695-066 Bobadela LRS, Portugal
4
Physics Department, Faculty of Sciences and Technologies, Universidade Nova de Lisboa, P-2829-516 Caparica, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Carlos J. Gómez García
Received: 28 April 2017 / Revised: 17 May 2017 / Accepted: 26 May 2017 / Published: 13 June 2017
(This article belongs to the Special Issue Magnetism of Molecular Conductors)
View Full-Text   |   Download PDF [3158 KB, uploaded 13 June 2017]   |  

Abstract

The α-(Per)2[M(mnt)2] compounds with M = Pt and Au are isostructural two-chain solids that in addition to partially oxidized conducting perylene chains also contain anionic chains that can be either paramagnetic in the case of M = Pt or diamagnetic for M = Au. The electrical transport and magnetic properties of the solid solutions (Per)2[Ptx-Au(1−x)(mnt)2] were investigated. The incorporation of paramagnetic [Pt(mnt)2] impurities in the diamagnetic chains, and the effect of breaking the paramagnetic chains with diamagnetic centers for the low and high Pt range of concentrations were respectively probed. In the low Pt concentration range, there is a fast decrease of the metal-to-insulator transition from 12.4 K in the pure Au compound to 9.7 K for x = 0.1 comparable to the 8.1 K in the pure Pt compound. In the range x = 0.50−0.95, only β-phase crystals could be obtained. The spin-Peierls transition of the pure Pt compound, simultaneous with metal-to-insulator (Peierls) transition is still present for 2% of diamagnetic impurities (x = 0.98) with transition temperature barely affected. Single crystal X-ray diffraction data obtained a high-quality structural refinement of the α-phase of the Au and Pt compounds. The β-phase structure was found to be composed of ordered layers with segregated donors and anion stacks, which alternate with disordered layers. The semiconducting properties of the β-phase are due to the disorder localization effects. View Full-Text
Keywords: organic conductors; perylene; metal-dithiolate; organic alloys; conductivity; thermoelectric power; magnetic susceptibility; spin-Peierls transition; Peierls transition organic conductors; perylene; metal-dithiolate; organic alloys; conductivity; thermoelectric power; magnetic susceptibility; spin-Peierls transition; Peierls transition
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Matos, M.; Bonfait, G.; Santos, I.C.; Afonso, M.L.; Henriques, R.T.; Almeida, M. The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds. Magnetochemistry 2017, 3, 22.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Magnetochemistry EISSN 2312-7481 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top