Oxidation-Resistant Metallocenes. The Thermal and Oxidative Stability of Polychlorinated Metallocenes

摘要

Polychlorinated metallocenes, including the recently synthesized decachloroferrocene and decachlororuthenocene, were investigated to determine the effect of increasing number of electron-withdrawing substituents on the thermal and oxidative stability of such metallocenes. Thermal analysis, including use of differential scanning calorimetry, indicated a definite, although not drastic, decrease in thermal stability with increasing chlorine content in these systems. Much greater (thermal) stability, as well as enhanced oxidative stability, was evidenced for decachlororuthenocene than for decachloroferrocene. In connection with the thermal analytical investigation, mesophases were discovered in 1,1',2,2'-tetrachloroferrocene, 1,1',2,2',3,3',4,4'-octachloroferrocene and decachlororuthenocene, some of which appeared to be liquid crystalline in nature. (Author)