Raman Spectral Study of Vibrational Relaxation of the CN Stretching Band of Acetonitrile and Benzonitrile

Bhattacharjee, D.; Ghosh, Alpana; Misra, T. N.; Nandy, Suman

doi:10.1002/(sici)1097-4555(199606)27:6<457::aid-jrs978>3.0.co;2-3

Cited by 20 publications

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“…Such a band splitting observed in the clusters may be quite important to investigate the dynamics of CN of BN in solution, in view of the fact that the CN Raman band of BN is widely broadened in solution. [37][38][39][40][41] Though several models are suggested to explain the broadening, the present result indicates that the splitting of CN due to cluster formation is mainly responsible for the broadening in solution. Figure 9 shows the FDSR spectra for 6a , 1 , and 12 vibrations.…”

Section: Cn Stretching Vibration ( Cn )mentioning

confidence: 56%

Mode dependent intracluster vibrational energy redistribution rate in size-selected benzonitrile–(CHCl3)n=1–3 clusters

Yamamoto

Ebata

Mikami

2001

The Journal of Chemical Physics

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The rate constants of intracluster vibrational energy redistribution (IVR) of benzonitrile–(CHCl3)1 for the 121 (1000 cm−1), 11 (760 cm−1), and 6a1 (460 cm−1) levels have been measured by time-resolved stimulated Raman-UV double resonance spectroscopy. It was found that the observed rate constants are independent of the energies but strongly dependent on the vibrational modes. In order to find a relationship between the structure and the IVR rate, structures of benzonitrile–(CHCl3)n=1–3 have been determined based on the results of the Raman spectra and the high resolution S1–S0 electronic spectra for the size-selected clusters, and ab initio MO calculations. The Raman spectra were observed for both CHCl3 and benzonitrile sites. It was found that the CH stretching vibration of the CHCl3 moiety showed a higher frequency shift in the clusters, whose magnitude depends on the binding site to benzonitrile. For the benzonitrile moiety, the Raman spectra of CH stretch (ν2), CN stretch (νCN), ring breathing (ν12 and ν1), and CCC in-plane bending (ν6a) vibrations were investigated. From those results, it was concluded that the clusters have the form such that the CH hydrogen of the first CHCl3 is hydrogen-bonded to the N end of the CN group, while second and third CHCl3 are hydrogen-bonded to the phenyl ring. The observed mode dependence of the IVR rate constants will be discussed based on the cluster structure and the vibrational motion.

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Section: Cn Stretching Vibration ( Cn )mentioning

confidence: 56%

Mode dependent intracluster vibrational energy redistribution rate in size-selected benzonitrile–(CHCl3)n=1–3 clusters

Yamamoto

Ebata

Mikami

2001

The Journal of Chemical Physics

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“…Similar features have been observed in acetonitrile, benzonitrile, aldehydes and amines. 28 From the x-ray data, it is found that there are no two carbonyl groups with different bond strengths. Hence the broadening and the appearance of the multiple bands for the carbonyl stretching band are due to the interaction of a carbonyl group with the other molecules.…”

Section: Vibrations Of the Carbonyl Groupmentioning

confidence: 99%

Raman and IR spectral studies of D‐phenylglycinium perchlorate

Ramaswamy

Rajaram

Ramakrishnan

2002

J Raman Spectroscopy

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The Raman and infrared spectra of D-phenylglycinium perchlorate were recorded at room temperature. Tentative vibrational assignments of the observed wavenumbers were made by comparison with the vibrational wavenumbers of glycine, phenylalanine and other similar compounds. Anions were found to coordinate through hydrogen bonding interactions to other ligands in the crystal, affecting the T d symmetry and thereby causing the degeneracies of several modes to be removed. The extensive intermolecular hydrogen bonding in the crystal leads to a shift of bands due to the stretching and bending modes of various functional groups. The broadening and appearance of multiple bands for the carbonyl stretching mode due to the resonance interaction is also discussed.

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“…However, in many practical cases, the values of anisotropy tensor elements are small and the rotation times and T 2 are sufficiently dissimilar that contribution of molecular rotation may be negligible [6]. For example, the depolarization ratio of the CN stretch modes are 0.04 and 0.045 for acetonitrile and benzonitrile, respectively [31], and the reorientational relaxation time is 5.58 ps for the CN mode of neat benzonitrile [28]. To minimize the rotational motion contribution experimentally, the magic angle polarization configuration can be applied [32] by using a set of accurately adjusted waveplates, but complete suppression of the contribution may still be difficult to achieve due to polarization mixing associated with tight focusing at the sample position.…”

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confidence: 99%

Optimized continuum from a photonic crystal fiber for broadband time-resolved coherent anti-Stokes Raman scattering

Lee¹,

Parekh²,

Kim³

et al. 2010

Opt. Express

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We demonstrate an optimization of continuum generation in a commercially available photonic crystal fiber and show that this continuum can be used to simultaneously measure vibrational dephasing times over an unprecedented frequency range of Raman modes. The dephasing time measurement is based on 2-pulse 3-color coherent anti-Stokes Raman scattering (CARS), and requires a continuum pulse that is coherent over a broad spectral bandwidth. We demonstrate that a continuum with the required characteristics can be generated from a photonic crystal fiber by appropriately conditioning the chirp of the excitation pulse and controlling its pulse energy. We are able to simultaneously measure vibrational dephasing times of multiple Raman modes (covering 500 cm(-1) to 3100 cm(-1)) of acetonitrile and benzonitrile using the optimized continuum with broadband time-resolved CARS.

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Raman Spectral Study of Vibrational Relaxation of the CN Stretching Band of Acetonitrile and Benzonitrile

Cited by 20 publications

References 0 publications

Mode dependent intracluster vibrational energy redistribution rate in size-selected benzonitrile–(CHCl3)n=1–3 clusters

Mode dependent intracluster vibrational energy redistribution rate in size-selected benzonitrile–(CHCl3)n=1–3 clusters

Raman and IR spectral studies of D‐phenylglycinium perchlorate

Optimized continuum from a photonic crystal fiber for broadband time-resolved coherent anti-Stokes Raman scattering

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