Doubly vibrationally enhanced four wave mixing spectroscopy in an acetonitrile–magnesium perchlorate mixture

✍ Scribed by Wei Zhao

• Book ID: 103837423
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 171 KB
• Volume: 799
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2006.01.069

✦ Synopsis

Doubly vibrationally enhanced (DOVE) four wave mixing (FWM) spectroscopy has been used to study the mixture of Mg(ClO 4 ) 2 and deuterated acetonitrile (CD 3 CN) which serves as a model for metal ion complexes. In the mixture, there are free acetonitrile species and coordinated Mg 2+ -CD 3 CN species both of which have corresponding vibrational features in the middle infrared region including CN stretch m 2 and CC stretch m 4 . In the free species, there is a combination band m 2 + m 4 at 3092 cm À1 . It is unclear whether there exists a combination band in the coordinated species of which the existence is important for implementing the DOVE-FWM. Here we have determined a combination band m 2 + m 4 at 3153 cm À1 for the coordinated species by using IR absorption spectroscopy and subsequently applied the DOVE-FWM to the mixture. The measured DOVE spectra show a strong DOVE enhancement not only for the free species but also for the coordinated species. The results demonstrate the feasibility of the DOVE-FWM methods for measuring the coordinated species involving charge transfer interaction, and provide a key feature for metal ion complex studies.