Tetrachlorocyclopentadienylidene, indenylidene and fluorenylidene in low-temperature matrices. Ultraviolet and infrared spectra and reactions with carbon monoxide

Abstract

Tetrachlorodiazocyclopentadiene, diazoindene and diazofluorene were isolated in N₂, CO and CO-doped N₂ matrices at 12 K. Upon photolysis each of the diazo compounds gave the corresponding carbene, for which u.v. and i.r. spectra are reported. In CO matrices or N₂ matrices containing CO the carbenes could be induced to react thermally with CO at ca. 30 K, yielding the corresponding ketenes.