Raman Spectra of Phenylacetylene in Acetonitrile and Methylcyclohexane at Low Temperatures. 2. Structural Order and Vibrational Relaxation in Frozen Matrices at 77 K
نویسنده
چکیده
Raman spectra of the νS(CtC) stretching mode of phenylacetylene (PA) dissolved in acetonitrile and methylcyclohexane have been recorded at 77 K and compared with spectra in the liquid solutions at room temperature [Kołodziejski, M.; Waliszewska, G.; Abramczyk, H. J. Phys. Chem. A 1998, 102, 1918]. Substantial narrowing of spectra in frozen matrices at low temperatures leads to revealing of vibrational structure. The results given in this paper are a spectacular example of monitoring structural order going from liquid solutions to frozen matrices at low temperatures by Raman spectroscopy.
منابع مشابه
Spectroscopy, Structural, and Optical Investigations of NiFe2O4 Ferrite
Ni ferrite crystalline material is synthesized using a sol-gel method at two different temperatures. The vibrational and stretching modes, crystalline phase, size distribution and morphology of the products are investigated via Raman back-scattering and Fourier transform infrared (FTIR) spectroscopy, XRD and FESEM, respectively. Vibrational modes of spinel ferrite are observed at Raman and FTIR...
متن کاملVibrational spectroscopic studies, conformations and ab initio calculations of 3,3,3-trifluoropropyltrichlorosilane.
Infrared spectra of 3,3,3-trifluoropropyltrichlorosilane (CF3CH2CH2SiCl3) were obtained in the vapour, amorphous and crystalline solid phases in the range 4000-50 cm-1. Additional spectra in argon matrices at 5.0 K were recorded before and after annealing to 20-36 K. Raman spectra of the compound as a liquid were recorded at various temperatures between 298 and 210 K and spectra of the amorphou...
متن کاملExcited-state distortions of cyclometalated Ir(III) complexes determined from the vibronic structure in luminescence spectra.
The luminescence spectra of [(tpy)(2)Ir(CN-t-Bu)2](CF(3)SO(3)) in methylcyclohexane glass and frozen n-nonane at 15 K reveal well-resolved vibronic fine structure. The vibronic peaks are assigned by comparison with the vibrational frequencies obtained from Raman and IR spectra and those obtained using DFT electronic structure calculations. The magnitudes of the distortions along the normal coor...
متن کاملHigh-pressure stability, transformations, and vibrational dynamics of nitrosonium nitrate from synchrotron infrared and Raman spectroscopy
The properties of nitrosonium nitrate (NONO3 ) were investigated following synthesis by laser heating of N2O and N2O4 under high pressures in a diamond anvil cell. Synchrotron infrared absorption spectra of NONO3 2 were measured at pressures up to 32 GPa at room temperature. Raman spectra were obtained at pressures up to 40 GPa at room temperature and up to 14 GPa at temperatures down to 80 K. ...
متن کاملFemtosecond excited state studies of the two-center three-electron bond driven twisted internal charge transfer dynamics in 1,8-bis(dimethylamino)naphthalene.
Femtosecond fluorescence upconversion and transient absorption experiments have been performed to monitor the photoinduced electronic, geometry, and solvent relaxation dynamics of 1,8-bis(dimethylamino)naphthalene dissolved in methylcyclohexane or n-hexane, n-dodecane, dichloromethane, and acetonitrile. The data have been analyzed by using a sequential global analysis method that gives rise to ...
متن کامل