Quantum chemical calculations reveal impact of solvent on properties and vibration modes of Bis(cyclopentadienyl)zirconium dichloride

Abstract

B3LYP/6–311++G** calculations for all atoms different from Zr have been performed for bis(cyclopentadienyl)zirconium (IV) dichloride in the gas phase, aqueous and n-hexane solutions to predict structural and vibrational properties and to analyse the impact of solvent on its properties. The results show that the 3–21G* basis set for the Zr generates better correlations than LanL2DZ. Higher solvation energy has been predicted in water than n-hexane. MEP surfaces revealed nucleophilic sites on the Cl atoms of Zr-Cl₂ moiety while electrophilic ones on the positively charged H atoms of (C₅H₅)₂ moiety. Higher stability of compound in n-hexane is supported by AIM and NBO calculations. High reactivity of compound in water was observed. Complete vibrational assignments are reported for first time by using the SQMFF methodology and normal internal coordinates. In addition, the scaled harmonic force constants are also reported. Predicted IR, Raman and NMR spectra show reasonable concordances with the experimental ones.