Zusammenfassung
The new tetraruthenium compd. [Ru(NH3)5]4(μ4-TCNQF4)(PF6)8, TCNQF4 = 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyano-p-benzoquinodimethane, was studied by cyclic voltammetry, IR, UV-Vis-NIR and EPR spectroelectrochem. The better p acceptor qualities of TCNQF4 in comparison to TCNQ cause more accessible redn. to produce [Ru(NH3)5]4(μ4-TCNQF4)7+ with enhanced metal contribution to the singly occupied MO and low-energy shifted IR vibrational and NIR electronic absorptions. However, the two-electron oxidn. to the (10+) ion is also facilitated. The reason is seen in a more metal-centered oxidn. for the TCNQF4 complex while the previously studied TCNQ analog is assumed to undergo a higher degree of oxidn. at the bridging ligand. As a result, the title species has a redox potential range of only 0.52 V, indicating a significantly diminished HOMO-LUMO gap. [on SciFinder(R)]
Nutzer
