Abstract
The isotropic and anisotropic parts of Raman spectra corresponding to CO stretching and NH2 bending modes of formamide (HCONH2) in different acetonitrile (CH3CN) concentration were investigated in the region 1500−1800 cm−1 to study the non-coincidence effect. The experimentally obtained values of NCE with varying solvent concentrations were explained using three different models namely, Mirone-Fini model, Mirone-McHale model, and Logan model respectively. The experimentally measured values of non-coincidence splitting, Δνnce, for neat HCONH2 in the modes corresponding to CO stretching and NH2 bending are ∼21 and ∼11.38 cm−1 which then reduces to a very low value of 1.26 and 0.5 cm−1 at mole fraction, ϰf=0.1 respectively. It has been observed that Mirone-McHale model and Logan model reproduces better experimental results of NCE of the CO stretching mode whereas Mirone-Fini model gives accurate results to explain the experimental results of NCE of the NH2 bending mode.
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