Spectroscopic (FT-IR/FT-Raman) and computational (HF/DFT) investigation and HOMO/LUMO/MEP analysis on 1,1-difluoro-2-vinyl-cyclopropane

•FT-IR/FT-Raman spectra of 1,1-difluoro-2-vinyl-cyclopropane were recorded.•The chemical shift was found and it is favor for its change of chemical property.•The vibrational properties of the molecule have been studied.•The electronic properties were studied using frontier molecular orbital analysis.•The thermodynamical parameters have been studied for different temperature.

All the computational calculations were made in the ground state using the HF and DFT (B3LYP) methods with 6-31++G (d,p) and 6-311++G (d,p) basis sets. Making use of the recorded data, the complete vibrational assignments were made and analysis of the observed fundamental bands of molecule was carried out. The shifting of the frequencies in the vibrational pattern of the title molecule due to the substitutions; CHCH2 and F were deeply investigated by the vibrational analysis. Moreover, 13C NMR and 1H NMR chemical shifts were calculated by using the gauge independent atomic orbital (GIAO) method with HF/B3LYP methods with 6-311++G (d,p). A study on the electronic properties, such as HOMO and LUMO energies, were performed by time-dependent DFT (TD-DFT) approach. Mulliken charges of the 1DF2VCP were also calculated and interpreted. The thermodynamic properties (heat capacity, entropy, and enthalpy) of the title compound at different temperatures were calculated in gas phase.

Graphical abstract1,1-Difluoro-2-vinyl-cyclopropane is used an intermediates in the synthesis of complex molecules because of their ready reactivity. Cyclopropane analogues are proved to show varied biological applications such as anti-HIV, anticancer, antibacterial, antifungal, antiviral, antitumor, COX-II inhibitor properties. Due to their diverse applications in synthetic, agricultural, and medicinal chemistry as well as in material science a thorough analysis of the physical and chemical properties of 1,1-difluoro-2-vinyl-cyclopropane is made.Figure optionsDownload full-size imageDownload as PowerPoint slide