Synthesis, characterisation and redox properties of anti-bimetallic permethylpentalene complexes

Abstract

Anti-bimetallic transition metal complexes based on the permethylpentanyl ligand: anti-(MCpR5)2Pn* (M = Fe, Co and Ni) have been synthesised and fully characterised.

Synthesis of a Tetraphenyl-Substituted Dihydropentalene and Its Alkali Metal Hydropentalenide and Pentalenide Complexes

“…Unlike their monocyclic relative, the 10 π cyclooctatetraene dianion (C 8 H 8 2– , COT 2– ), pentalenides can either wrap around large, electron-deficient metals in η 8 by flexing around the central C–C bridge, or bind two metals as η 5 /η 5 , η 5 /η 3 , or η 3 /η 3 in syn or anti configuration. , The latter binding mode promises access to a range of interesting homo- and hetero-bimetallic complexes with electronic communication between the metals that may be exploited for cooperative reactivity. − The monoanion PnH – can also be used as a ligand, and some hydropentalenide complexes have been used as precursors for hetero-bimetallic Pn 2– complexes − Silylated Pn 2– derivatives, synthesized by functionalization of unsubstituted pentalenide in the 1 and 4 positions, have also been described . However, both the unsubstituted Pn 2– and the permethylated Pn* 2– are not trivial to synthesize, and there are no examples of well characterized and easily accessible aryl-substituted pentalenides .…”