Abstract
A series of infrared reflectance measurements using FT-IR Micro methods were conducted on bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or "ET") and bis(propylenedithio)tetrathiafulvalene (BPDT or "PT") salts of the type (ET)<sub>2</sub><i>X</i>, where <i>X</i> = I<sub>3</sub><sup>−</sup>, AuCl<sub>2</sub><sup>−</sup>, AuBr<sub>2</sub><sup>−</sup>, AuI<sub>2</sub><sup>−</sup>, I<sub>2</sub>Br<sup>−</sup>, IBr<sub>2</sub><sup>−</sup>, ICl<sub>2</sub><sup>−</sup>, ReO<sub>4</sub><sup>−</sup>, CIO<sub>4</sub><sup>−</sup>, and CH<sub>3</sub>-[hexagon]-SO<sub>3</sub><sup>−</sup>; and (PT)<sub>2</sub><i>X</i>, where <i>X</i> = I<sub>3</sub><sup>−</sup>, IBr<sub>2</sub><sup>−</sup>, I<sub>2</sub>Br<sup>−</sup>, and ICl<sub>2</sub><sup>−</sup>. The technique is useful for characterizing, at room temperature, differences between β-, β'- and α'-type structures vs. α-structures. The β-, β'-, and α'-type structures show a vibrational feature at ∼1280 cm<sup>−1</sup> which has been assigned as the -C-C-H bending vibration and is absent in the spectrum of the α-type salts. This vibration shifts toward higher frequency in going from the PT to the ET salts, and the results indicate stronger hydrogen bonding and harder lattices in the ET salts as opposed to the PT salts. This frequency shift also appears to be a function of the electronegativity of the halogen in the anion moiety of the charge-transfer salt.
PDF Article
More Like This
SERS study on the synergistic effects of electric field enhancement and charge transfer in an Ag2S quantum dots/plasmonic bowtie nanoantenna composite system
Bin Wang, Chen Zhao, Huanyu Lu, Tingting Zou, Subhash C. Singh, Zhi Yu, Chaonan Yao, Xin Zheng, Jun Xing, Yuting Zou, Cunzhu Tong, Weili Yu, Bo Zhao, and Chunlei Guo
Photon. Res. 8(4) 548-563 (2020)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription