Infrared optical constants and absorption intensities of hexamethylbenzene-tetracyanoethylene complexes

Saheki, Masao; Yamada, Haruka

doi:10.1016/0584-8539(76)80193-6

Cited by 10 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also prepared crystalline samples of the 1 : 1 and 2 : 1 complexes by dissolving HMB and TCNE with 1 : 1 or 2 : 1 stoichiometrical ratios, respectively, in diethyl ether, and the solvent was evaporated slowly. 10,19 Needle-shaped crystals were obtained for the 1 : 1 and 2 : 1 complexes. These were collected and aligned with each other to measure parallel and perpendicular components of the THz spectra.…”

Section: Experimental and Calculationsmentioning

confidence: 99%

“…Generally, the far-infrared (IR) region corresponds to intermolecular motions of the complexes, and microscopic information on the charge-transfer complexes such as intermolecular interactions and structural fluctuations can be studied by the far-IR spectra. There has been much effort to investigate the intermolecular vibrational band of the HMB-TCNE complex by optical absorption, [4][5][6] IR absorption, [7][8][9][10][11] resonance-Raman scattering, [12][13][14][15][16][17][18] X-ray crystallography, 19 time-resolved measurements, 20,21 and molecular orbital calculation. [22][23][24][25] However, it is still an open question to clarify the low-frequency vibrational mode of the complex.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Yamamoto

Kabir²,

Hayashi

et al. 2005

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We have measured the frequency dependent extinction coefficients and refractive indices of electron donor-acceptor (EDA) complexes consisting of hexamethylbenzene (HMB; electron donor) and tetracyanoethylene (TCNE; electron acceptor) in the low-frequency region by terahertz time-domain spectroscopy (THz-TDS). A mixture of the 1:1 (DA) and 2:1 (D2A) EDA complexes exist in carbon tetrachloride solution, and we successfully obtained the spectral components of the 1:1 and 2:1 EDA complexes separately by analyzing the concentration dependence of the THz spectra. The 1:1 and 2:1 complexes show quite different THz spectra of the extinction coefficient, reflecting unique features of dynamics, fluctuations and intermolecular interactions of these complexes. Polarization-selective THz-TDS on the crystalline DA complex shows two peaks at 53 and 70 cm(-1) in the spectral component perpendicular to the crystal axis. On the other hand, the crystalline D2A complex exhibits peaks at 42 and 50 cm(-1) in the perpendicular spectral component. We compare the obtained spectra of the crystalline complex and the results of molecular orbital calculations at the HF/6-31G(d) level of theory to discuss the intermolecular vibrational modes of the complexes.

show abstract

Section: Experimental and Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Yamamoto

Kabir²,

Hayashi

et al. 2005

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Spectral Properties of Some Weak Electron‐Donor‐Acceptor (EDA)‐Complexes in the Far Infrared (FIR.) Region (40–400 cm⁻¹)

Rossi

Haselbach

1979

Helvetica Chimica Acta

View full text Add to dashboard Cite

SummaryThe absorption spectra of 11 solid-state EDA-complexes of unsaturated hydrocarbon donors with TCNE as acceptor have been studied in the FIR. region (40-400 cm-'). The dominant feature in the spectra is the appearance of a new intense absorption in the region 80-100 cm-' which is assigned to the intra charge-transfer lattice mode. The (idealized) force constant for this lattice mode is found to be roughly constant for most of the EDA-complexes and is thus believed to be a measure of the total interaction of donor and acceptor within the crystal site. Force constants differing in magnitude from those of the majority of complexes are traced back to a particular structure of the donor component and/or the EDA-crystal as a whole. A recently proposed reassignment of the Raman active fundamentals of pure TCNE is questioned in view of the present findings.

show abstract

Valence force field analysis of tetracyanoethylene

Michaelian¹,

Rieckhoff

Voigt

1982

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

Infrared optical constants and absorption intensities of hexamethylbenzene-tetracyanoethylene complexes

Cited by 10 publications

References 14 publications

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Spectral Properties of Some Weak Electron‐Donor‐Acceptor (EDA)‐Complexes in the Far Infrared (FIR.) Region (40–400 cm⁻¹)

Valence force field analysis of tetracyanoethylene

Contact Info

Product

Resources

About

Infrared optical constants and absorption intensities of hexamethylbenzene-tetracyanoethylene complexes

Cited by 10 publications

References 14 publications

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Low-frequency spectra of the hexamethylbenzene/tetracyanoethylene electron donor–acceptor complexes in solution studied by terahertz time-domain spectroscopy

Spectral Properties of Some Weak Electron‐Donor‐Acceptor (EDA)‐Complexes in the Far Infrared (FIR.) Region (40–400 cm−1)

Valence force field analysis of tetracyanoethylene

Contact Info

Product

Resources

About

Spectral Properties of Some Weak Electron‐Donor‐Acceptor (EDA)‐Complexes in the Far Infrared (FIR.) Region (40–400 cm⁻¹)