IR and Raman spectra of beta''-(BEDT-TTF)(2)RCH(2)SO(3) (R = SF(5), CF(3)): dimerization related to hydrogen bonding.
The beta''-(BEDT-TTF)(2)CF(3)CH(2)SO(3) organic conductor has been synthesized by electrocrystallization. The crystal structure was determined by single-crystal X-ray diffraction and electronic properties examined. The polarized IR reflectance of beta''-(BEDT-TTF)(2)SF(5)CH(2)SO(3) and beta''-(BEDT-TTF)(2)CF(3)CH(2)SO(3), as well as Raman spectra of beta''-(BEDT-TTF)(2)CF(3)CH(2)SO(3) have been measured as a function of temperature. Both materials display charge-nonequivalence within the whole temperature range and unusual activation of vibronic modes with lowering the temperature. In particular, electron-molecular vibration coupling is involved in the activation of the nu(27) mode. The effect is discussed in terms of lattice dimerization involving hydrogen bonding between the anion layer and the conducting BEDT-TTF layer.
Olejniczak
Iwona
I
Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego, Poznań, Poland. olejniczak@ifmpan.poznan.pl
Barszcz
Bolesław
B
Szutarska
Anna
A
Graja
Andrzej
A
Wojciechowski
Roman
R
Schlueter
John A
JA
Hata
Aaron N
AN
Ward
Brian H
BH