Spin-peierls transition in dimerized stacks of anion-radical salt (N-Me-2,5-di-Me-Pz)(TCNQ)2, (Pz is pyrazine)

Abstract

An anion-radical salt (ARS) (N-Me-2,5-di-Me-Pz)(TCNQ) 2 , where Pz is pyrazine, was synthesized and its crystal structure was resolved. X-ray diffraction experiments on single crystals were performed. Heat capacity was measured in the temperature range from 2 K to 300 K. Magnetisation and magnetic susceptibility were measured in the temperature range from 2 K to 300 K and the low-temperature part was measured in

Two-gap magnetic structure of the two-stack anion-radical salt (N-Me-3,5-Di-Me-Py)(TCNQ)2 (Py is pyridine)

“…Recently we have studied magnetic and thermodynamic properties of samples (N-Me-2,5-di-MePz)(TCNQ) 2 [1] described with a dimerized Heisenberg spin 1/2 chain model and (NMe-2,6-di-Me-Pz)(TCNQ) 2 [2] described with a spin-ladder model. These compounds have very similar composition, in which only the position of the methyl group on the cation core is varying, but they differ significantly in the crystal structure, due to small changes in cation molecules.…”

Temperature induced reversible structural and magnetic changes in a crystal of tetrachlorosemiquinone anion radical

“…[1][2][3] Among them, organic radicals are very promising in the design of (multi)functional materials exploiting great flexibility and versatility in chemical syntheses. [3][4][5][6][7][8][9][10][11][12] The radicals as the electron spin carriers are very important for designing novel molecular functionalities. 3 Organic radicals with p-systems that undergo spontaneous self-association producing stacked dimers can be exploited in developing strategies for molecular manipulations to reach functional materials.…”

Magnetic Specific Heat of Anion-Radical Salt [Ni(bipy)3](TCNQ)4·(CH3)2CO at Very Low Temperatures

“…The high temperature approximation of the magnetic contribution can be described by a Maxwell relation which yields [8,9]:…”

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Thermodynamic studies of the anion-radical salt system [Ni(bipy)3](TCNQ)4·(CH3) 2CO, where TCNQ is 7,7 ,8, are reported. The anion-radical salt systems based on TCNQ belong to a material class in which the arrangement of the anion-radical salt has considerable impact on the charge transfer and magnetic properties.

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