Terahertz vibrational spectra of metallocene

In Situ Observation of Gas Adsorption onto ZIF-8 Using Terahertz Waves

“…Other measurement details are reported elsewhere. 12,24 Time profiles were measured with the same spectrometer at a fixed frequency of 2 THz to study the transitional response of terahertz transmittance of the ZIF-8 after the introduction of gases. Data were collected with a time interval of 1 s. All spectra and time profiles were measured at 27 °C at atmospheric pressure.…”

“…Spectra were smoothed using a three-point average. Other measurement details are reported elsewhere. , …”

“…Studies shows that the swinging motion of the 2-methylimidazole ligand has a characteristic vibrational mode and resonant frequency. Previous spectroscopic studies on organic and organometallic compounds 12 reported that certain fundamental vibrations of the linker molecules comprising the MOF lattice are expected to fall in the terahertz (THz) frequency band, usually defined as ranging from 0.1 to 10 THz (ca. 3−333 cm −1 ).…”

Electronic structures of organometallic complexes of f elements LXXIV: First Raman spectroscopic polarization measurements on uniformly oriented sandwich complex molecules: Bis(η5-pentamethylcyclopentadienyl)ruthenium

“…375 (3), 352 (1) and 332 (2) cm À1 [7, Table 3] of MCp 2 * complexes shows a much stronger dependence on the mass of the central ion, thus suggesting that these signals correspond to n as modes (see Table 4). The transmission spectrum of crystalline 3 recorded by means of a recently developed GaP Raman THz spectrometer shows a weak signal at 4.2 THz (140 cm À1 ) which was tentatively correlated with the IR allowed and Raman forbidden Cp*eFeeCp* deformation vibration [23]. In case of complex 1, we could not observe a signal in this range neither in the Raman nor in the IR spectrum, but low energetic FIR bands at 89 and 117 cm À1 appeared (see Fig.…”

Terahertz absorption spectra of 8-hydroxyquinoline and its some metal complexes

“…THz-TDS provides us with a powerful tool and technology for discussing metal-ligand complexes. Nishizawa [6] presented the transmission spectra of metallocene (Cp2Fe, Cp2Ni, Cp2Ru) and decamethyl metallocene in the range of 0.7-6.2 THz measured by GaP Raman terahertz spectrometer. Yang [7] recorded THz absorption spectra of some saccharides and their metal complexes and the results show that THz methods may be more sensitive tools than mid-IR technique for characterization of metal-sugar complexes.…”