Add time:08/21/2019         Source:sciencedirect.com

Nearly-free internal rotation produces huge (>1 GHz) tunneling splittings in the rotational spectrum of meta-chlorotoluene. Additionally, the simultaneous presence of two chlorine (35Cl and 37Cl) isotopologues results in dense spectra with complicated hyperfine patterns, hampering the spectral analysis by conventional spectroscopic techniques. Sub-Doppler molecular-beam Fourier transform microwave rotational spectroscopy has been used to study the internal rotation and nuclear quadrupole coupling terms in meta-chlorotoluene. Notably, with the halogen substituent in meta position of the methyl internal rotor, the periodic torsional potential contains six-fold V6 terms that are larger than the three-fold V3 terms. Molecular parameters for the two isotopologues of meta-chlorotoluene are reported and compared with DFT (B3LYP) and ab initio (MP2) calculations.

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