Spectral properties of the TCNQ anion radical salt (N-Me-2,5-(Me)2-Pz)(TCNQ)2

(N-Me-2,6-di-Me-Pz) (TCNQ)2—genuine organic anion-radical salt: a spin-ladder?

“…The above-mentioned band is most probably related to the normal mode with B 3g symmetry, activated by EMV coupling. We have observed a similar feature in the (N-Me-2, 5-(Me) 2 -Pz)(TCNQ) 2 salt [15]. It is well known that the position of some A g modes in the Raman spectrum depends on the average charge on the molecule [16][17][18].…”

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

“…with the absence of splitting bands in the Raman spectra [9]. Experimental bond lengths in TCNQ molecules were used in the HOSE approach [14] to estimate the charge on anions to be about -0.44 e. This value is in a good agreement with the value (-0.51 e) estimated from Raman spectra [9].…”

“…Experimental bond lengths in TCNQ molecules were used in the HOSE approach [14] to estimate the charge on anions to be about -0.44 e. This value is in a good agreement with the value (-0.51 e) estimated from Raman spectra [9]. Both methods, structural and spectroscopic, of the charge determination are approximate (with the error of few percents) and neglect the effects induced by neighboring molecules.…”

“…The optical properties of this ARS were described recently [9]. The crystal structure of this ARS differs considerably from the crystal structure of (N-Me-2,6-di-Me-Pz)(TCNQ) 2 [10], although from the chemical point of view they differ only in the position of methyl groups in cation molecule.…”