The small binding energies of the negative cluster ions: SF5−(SF6)1, SF6−(SF6)1 and F−(SF6)n (n = 1 and 2), in the gas phase

✍ Scribed by Kenzo Hiraoka; Akitaka Shimizu; Akihito Minamitsu; Masayuki Nasu; Susumu Fujimaki; Shinichi Yamabe

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 288 KB
• Volume: 241
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00676-u

✦ Synopsis

The gas-phase clustering reactions of SF~, SF 6 and F-ions with SF 6 were measured using a high-pressure mass spectrometer. The bond energies of SFs--(SF6) 1 and SF6(SF6) 1 were estimated to be ~< 2.3 kcal/mol. The bond energies of F-(SF6) , with n = 1 and 2 were determined to be 5.4 and = 4.1 kcal/mol, respectively. This result indicates that the SF 6 molecule is the weakest electrophilic reagent toward F-ever reported. This is mainly due to the exchange repulsion between the negative ions and fluorine atoms surrounding the reactive S atom. The structure of the cluster ion F-(SF6) 1 whose binding energy was surprisingly small was investigated by ab initio MO calculations.