The solid solutions (Per)2[PtxAu(1−x)(mnt)2]; alloying para-and diamagnetic anions in two-chain compounds

Manuel Matos; Gregoire Bonfait; Isabel C. Santos; Mónica L. Afonso; Rui T. Henriques; Manuel Almeida

doi:10.3390/magnetochemistry3020022

The solid solutions (Per)₂[Pt_xAu_(1−x)(mnt)₂]; alloying para-and diamagnetic anions in two-chain compounds

Manuel Matos, Gregoire Bonfait, Isabel C. Santos, Mónica L. Afonso, Rui T. Henriques, Manuel Almeida

DF – Departamento de Física

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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[Pt_x-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.

Original language	English
Article number	22
Journal	Magnetochemistry
Volume	3
Issue number	2
DOIs	https://doi.org/10.3390/magnetochemistry3020022
Publication status	Published - Jun 2017

Keywords

Conductivity
Magnetic susceptibility
Metal-dithiolate
Organic alloys
Organic conductors
Peierls transition
Perylene
Spin-Peierls transition
Thermoelectric power

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10.3390/magnetochemistry3020022

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title = "The solid solutions (Per)2[PtxAu(1−x)(mnt)2]; alloying para-and diamagnetic anions in two-chain compounds",

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.",

keywords = "Conductivity, Magnetic susceptibility, Metal-dithiolate, Organic alloys, Organic conductors, Peierls transition, Perylene, Spin-Peierls transition, Thermoelectric power",

author = "Manuel Matos and Gregoire Bonfait and Santos, {Isabel C.} and Afonso, {M{\'o}nica L.} and Henriques, {Rui T.} and Manuel Almeida",

note = "Funding Information: Acknowledgments: This work was partially supported by FCT (Portugal) through contracts UID/EEA/ 50008/2013, PTDC FIS/113500/2009 and UID/Multi/04349/2013. Publisher Copyright: {\textcopyright} 2017 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2017",

month = jun,

doi = "10.3390/magnetochemistry3020022",

language = "English",

volume = "3",

journal = "Magnetochemistry",

issn = "2312-7481",

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T1 - The solid solutions (Per)2[PtxAu(1−x)(mnt)2]; alloying para-and diamagnetic anions in two-chain compounds

AU - Matos, Manuel

AU - Bonfait, Gregoire

AU - Santos, Isabel C.

AU - Afonso, Mónica L.

AU - Henriques, Rui T.

AU - Almeida, Manuel

N1 - Funding Information: Acknowledgments: This work was partially supported by FCT (Portugal) through contracts UID/EEA/ 50008/2013, PTDC FIS/113500/2009 and UID/Multi/04349/2013. Publisher Copyright: © 2017 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2017/6

Y1 - 2017/6

N2 - 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.

AB - 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.

KW - Conductivity

KW - Magnetic susceptibility

KW - Metal-dithiolate

KW - Organic alloys

KW - Organic conductors

KW - Peierls transition

KW - Perylene

KW - Spin-Peierls transition

KW - Thermoelectric power

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U2 - 10.3390/magnetochemistry3020022

DO - 10.3390/magnetochemistry3020022

M3 - Article

AN - SCOPUS:85097041113

SN - 2312-7481

VL - 3

JO - Magnetochemistry

JF - Magnetochemistry

IS - 2

M1 - 22

ER -

The solid solutions (Per)₂[Pt_xAu_(1−x)(mnt)₂]; alloying para-and diamagnetic anions in two-chain compounds

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Keywords

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