Synthesis, structure and electrochemistry of CO incorporated diruthenium metallacyclic compounds [Ru2(CO)6{μ-η1:η1:η2:η2-1,4-Fc2C5H2O}] and [Ru2(CO)6{μ-η1:η1:η2:η2-1,5-Fc2C5H2O}

Abstract

Ferrocenyl substituted ruthenium metallacyclic compounds, [Ru 2 (CO) 6 {μ-η 1 :η 1 :η 2 :η 2 -1,4-Fc 2 C 5 H 2 O}] ( 1 ) and [Ru 2 (CO) 6 {μ-η 1 :η 1 :η 2 :η 2 -1,5-Fc 2 C 5 H 2 O}] ( 2 ) have been synthesized and structurally characterized. Electrochemical studies for 1 and 2 and the respective quinones, 3 and 4 show electrochemical coupling between the two redox active ferrocenyl units via the bridging ligand. The electrochemical coupling has been observed to depend upon the orientation and position of the ferrocenyl units. Ferrocenyl substituted ruthenium metallacyclic compounds, [Ru 2 (CO) 6 {μ-η 1 :η 1 :η 2 :η 2 -1,4-Fc 2 C 5 H 2 O}] ( 1 ) and [Ru 2 (CO) 6 {μ-η 1 :η 1 :η 2 :η 2 -1,5-Fc 2 C 5 H 2 O}] ( 2 ) have been synthesized and structurally characterized. Electrochemical studies for 1 and 2 and the respective quinone derivatives 3 and 4 show weak to no electrochemical coupling at the mixed-valent intermediate state which is dependent on the complex frameworks.