Raman spectral studies on per/poly fluorodiacyl peroxides

Raman spectroscopy is found to be an effective technique to characterize the symmetrical peroxy bond vibration frequencies of per/poly fluorodiacyl peroxides (RfCOO)2 (Rf=CF3, C2F5, n-C3F7, n-C7F15, H(CF2)2,4,6, 1–7) in F-113 (CClF2CCl2F) solution. The Raman absorptions of the peroxy bond (νOO) and carbonyl bond (νCO) for these compounds are strong. The νOO frequencies of (RfCOO)2 range from 699 to 731 cm−1, which are much lower than those of non-fluorinated peroxides (8–12). [H(CF2)2COO]2 exhibits a low frequency νOO of 699 cm−1, which may be due to intermolecular hydrogen bonding.