Magnetic susceptibility and electrical conductivity of Perylene radical cation salts

2000 ◽  
Vol 16 (3) ◽  
pp. 403-410 ◽  
Author(s):  
R. Desquiotz ◽  
M. Hofmann ◽  
E. Dormann
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Radical Cation ◽  
Radical Cation Salts

Electron-Donating Radialenes. Potential Donors for Molecular Organic (Super) Conductors and Ferromagnets

1989 ◽  
Vol 173 ◽  
Author(s):  
Z. Yoshida ◽  
T. Sugimoto ◽  
Y. Misaki
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Charge Transfer ◽  
Single Crystals ◽  
Temperature Change ◽  
Radical Cation ◽  
Electrical Conductivities ◽  
New Type ◽  
Ct Complexes

ABSTRACTThe electron-donating [n]radialenes (n=3,4,5) were prepared with the aim of developing both new type of organic (super)conductors and unprecedented organic/molecular ferromagnets. The charge-transfer (CT) complexes of 1,3-dithiole[4]radialene with TCNQ and of 1,3-benzodithiole-[4]radialene with TCNQF4 and DDQ showed comparatively high electrical conductivities in compressed pellets. The single crystals of PF6 and CIO4 salts of 1,3-benzodithiole[4]radialene radical cation revealed temperature change of electrical conductivity characteristic of a semiconductor. The magnetic properties of the bis(trifluoroacetate)salt of thioxanthene[3]-radialene dication and of the CT complexes of 1,3-benzodithiole[5]-radialene with DDQ, TCNQF4, and hexacyanohexamethylenecyclopropane, were also investigated from the ESR and/or magnetic susceptibility measurements.

scholarly journals Dihedral-Angle Dependence of Intermolecular Transfer Integrals in BEDT-BDT-Based Radical-Cation Salts with θ-Type Molecular Arrangements

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 868
Author(s):  
Tomofumi Kadoya ◽  
Shiori Sugiura ◽  
Toshiki Higashino ◽  
Keishiro Tahara ◽  
Kazuya Kubo ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Dihedral Angle ◽  
Radical Cation ◽  
Structural Phase ◽  
Tight Binding ◽  
Chain Model ◽  
Tight Binding Approximation ◽  
Highest Occupied Molecular Orbital ◽  
Radical Cation Salts ◽  
Transfer Integral

We report the structural and physical properties of a new organic Mott insulator (BEDT-BDT)AsF6 (BEDT-BDT: benzo[1,2-g:4,5-g′]bis(thieno[2,3-b][1,4dithiin). This AsF6 salt has the same structure as the PF6 salt. Although the anions are disordered, the donor molecules form a θ-type arrangement. The temperature dependence of the resistivity exhibits semiconducting behavior. The static magnetic susceptibility follows Curie–Weiss law over a wide temperature range; however, below 25 K, the magnetic susceptibility is in agreement with a one-dimensional chain model with the exchange coupling J = 7.4 K. No structural phase transition was observed down to 93 K. At 270 K, the Fermi surface calculated by the tight-binding approximation is a two-dimensional cylinder; however, it is significantly distorted at 93 K. This is because the dihedral angles between the BEDT-BDT molecules become larger due to lattice shrinkage at low temperatures, which results in a smaller transfer integral (t1) along the stack direction. This slight change in the dihedral angle gives rise to a significant change in the electronic structure of the AsF6 salt. Radical-cation salts using BEDT-BDT, in which the highest occupied molecular orbital does not have a dominant sign throughout the molecule, are sensitive to slight differences in the overlap between the molecules, and their electronic structures are more variable than those of conventional θ-type conductors.

Synthesis and Physical Properties of two Organic Donor Derivatives of 12-Molybdophosphate Anion [PMO12O40] n-: New Examples of Mixed-Valence Organic Donor-Inorganic Acceptor Compounds

1992 ◽  
Vol 247 ◽  
Author(s):  
D. Attanasio ◽  
C. Bellitto ◽  
M. Bonamico ◽  
G. Righini ◽  
G. Staulo
Keyword(s):  
Electrical Conductivity ◽  
Physical Properties ◽  
Radical Cation ◽  
Organic Semiconductors ◽  
Mixed Valence ◽  
Two Dimensional ◽  
Keggin Anion ◽  
Radical Cation Salts ◽  
Mixed Valence Compounds ◽  
Derivatives Of

ABSTRACTTetrathiafulvalene and bis(ethylenedithio)tetrathiaful-valene radical-cation salts of the a-Keggin anion [PMo12O40] have been synthesized and characterized. They both are mixed-valence compounds and contain the paramagnetic anion [PMO12O40] 4-. The former contains irregular TTF ϱ+ chains isolated by the inorganic anions. From the IR spectrum a ϱ=+0.5 is suggested. The latter is two-dimensional, where BEDT-TTF molecules are ionised, ϱ=+0.5, and arranged in irregular chains. They show electrical conductivity typical of organic semiconductors.

New Electroconducting Radical Cation Salts Based on BEDT-TTF with 8,8’-Dibromo Cobalt Bis(Dicarbollide) Anion

2008 ◽  
Vol 54 ◽  
pp. 331-336 ◽  
Author(s):  
Olga Kazheva ◽  
Grigorii Alexandrov ◽  
Andrey Kravchenko ◽  
Vladimir Starodub ◽  
Irina Lobanova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Crystal Structures ◽  
Radical Cation ◽  
Molecular Conductors ◽  
Electrical Conductivities ◽  
Radical Cation Salts

New molecular conductors on the base of 8,8’-dibromo cobalt bis(dicarbollide) anion, (BEDT-TTF)2[8,8’-Br2-3,3’-Co(1,2-C2B9H10)2] (1), and (BEDT-TTF)[8,8’-Br2-3,3’-Co(1,2-C2B9H10)2] (2) were synthesized and their crystal structures and electrical conductivities were determined. Both radical cation salts prepared were found to be semiconductors. The introduction of two bromine atoms in the cobalt bis(dicarbollide) anion produces a strong effect on crystal structure and electrical conductivity of the prepared materials.

scholarly journals The Relationship between Soil Electrical Parameters and Compaction of Sandy Clay Loam Soil

Agriculture ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 114
Author(s):  
Katarzyna Pentoś ◽  
Krzysztof Pieczarka ◽  
Kamil Serwata
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Precision Agriculture ◽  
Soil Compaction ◽  
Soil Layer ◽  
Soil Parameters ◽  
Soil Electrical Conductivity ◽  
Electrical Parameters ◽  
Management Zones ◽  
Additional Information

Soil spatial variability mapping allows the delimitation of the number of soil samples investigated to describe agricultural areas; it is crucial in precision agriculture. Electrical soil parameters are promising factors for the delimitation of management zones. One of the soil parameters that affects yield is soil compaction. The objective of this work was to indicate electrical parameters useful for the delimitation of management zones connected with soil compaction. For this purpose, the measurement of apparent soil electrical conductivity and magnetic susceptibility was conducted at two depths: 0.5 and 1 m. Soil compaction was measured for a soil layer at 0–0.5 m. Relationships between electrical soil parameters and soil compaction were modelled with the use of two types of neural networks—multilayer perceptron (MLP) and radial basis function (RBF). Better prediction quality was observed for RBF models. It can be stated that in the mathematical model, the apparent soil electrical conductivity affects soil compaction significantly more than magnetic susceptibility. However, magnetic susceptibility gives additional information about soil properties, and therefore, both electrical parameters should be used simultaneously for the delimitation of management zones.

scholarly journals New Radical Cation Salts Based on BDH-TTP Donor: Two Stable Molecular Metals with a Magnetic [ReF6]2− Anion and a Semiconductor with a [ReO4]− Anion

2021 ◽  
Vol 7 (4) ◽  
pp. 54
Author(s):  
Nataliya D. Kushch ◽  
Gennady V. Shilov ◽  
Lev I. Buravov ◽  
Eduard B. Yagubskii ◽  
Vladimir N. Zverev ◽  
...  
Keyword(s):  
Radical Cation ◽  
Low Temperatures ◽  
Ac Susceptibility ◽  
Slow Relaxation ◽  
Organic Radical ◽  
Inorganic Anion ◽  
Distinctive Features ◽  
Metallic Character ◽  
Radical Cation Salts ◽  
Partial Population

Three radical cation salts of BDH-TTP with the paramagnetic [ReF6]2− and diamagnetic [ReO4]− anions have been synthesized: κ-(BDH-TTP)4ReF6 (1), κ-(BDH-TTP)4ReF6·4.8H2O (2) and pseudo-κ″-(BDH-TTP)3(ReO4)2 (3). The crystal and band structures, as well as the conducting properties of the salts, have been studied. The structures of the three salts are layered and characterized by alternating κ-(1, 2) and κ″-(3) type organic radical cation layers with inorganic anion sheets. Similar to other κ-salts, the conducting layers in the crystals of 1 and 2 are formed by BDH-TTP dimers. The partial population of positions of Re atoms and disorder in the anionic layers of 1–3 are their distinctive features. Compounds 1 and 2 show the metallic character of conductivity down to low temperatures, while 3 is a semiconductor. The ac susceptibility of crystals 1 was investigated in order to test the possible slow relaxation of magnetization associated with the [ReF6]2− anion.

ChemInform Abstract: Tetrathiafulvalene-Based Radical Cation Salts with Transition Metal Bis(dicarbollide) Anions

ChemInform ◽  
2016 ◽  
Vol 47 (11) ◽  
pp. no-no
Author(s):  
Vladimir I. Bregadze ◽  
Oleg A. Dyachenko ◽  
Olga N. Kazheva ◽  
Andrey V. Kravchenko ◽  
Igor B. Sivaev ◽  
...  
Keyword(s):  
Transition Metal ◽  
Radical Cation ◽  
Radical Cation Salts
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