Frequency domain doubly vibrationally enhanced (DOVE) four wave mixing (FWM) spectroscopy and time-resolved frequency domain triply vibrationally enhanced (TRIVE) FWM spectroscopy have been used to study metal-acetonitrile complexes. In a mixture of magnesium perchlorate and deuterated acetonitrile (CD3CN), there are free acetonitrile species and coordinated Mg2+-CD3CN species both of which have corresponding vibrational features in the middle infrared region including CN stretch and CC stretch. The measured DOVE spectra show a strong DOVE enhancement for both the free species and the coordinated species. The stimulated 2D DOVE spectrum well reproduces the experimental spectral features and indicates that the nonresonant background could be minimized in the imaginary part of the 2D spectrum. Furthermore, in a mixture of magnesium perchlorate and acetonitrile (CH3CN), vibrational energy exchanges are observed between CN stretch v2 and a combination band v3+v4 in coordinated Mg2+-CH3CN species and between the free species and the coordinated species by TRIVE on a time scale of 0-100 ps. The results provide key features of coherent multidimensional spectroscopy for metal ion complex studies.

Dove and Trive coherent multidimensional spectroscopy of metal-acetonitrile complexes

ACS Spring Meeting 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.