Reversible Öffnung von Metall-Metall-Bindungen : Quantitative Untersuchung des Ringöffnungsgleichgewichts von [Cp'(CO2)Mn]2SeAryl+

The compounds [Cp'(CO) 2 Mn] 2 SeR + are isoelectronic analogues of the well known «inidene»-species [L n M]ER (E=P, As, Sb, Bi). While these latter «inidene» compounds exist in an open form with no metal-metal-interaction and the main group atom in a trigonal planar environment allowing for a three-center-4π-system MEM, their isoelectronic selenium analogues generally show equilibria between the «inidene»-type metal metal non bonded forms and their metal metal bond closed cyclic isomers