Coordinating tectons: Bipyridyl terminated allenylidene complexes

Marie P. Cifuentes, Mark G. Humphreys, George A. Koutsantonis, Nigel A. Lengkeek, Simon Petrie, Vanessa Sanford, Phil A. Schauer, Brian W. Skelton, Robert Stranger, Allan H. White

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)


    A series of complexes with π-conjugated carbon chains terminated by bipyridyl moieties has been prepared. These allenylidene complexes were derived from 9-hydroxy-9-ethynyl-4,5-diazafluorene, the preparation of which is reported; the new allenylidene complexes are highly colored with the cumulated carbon chain terminating in a bipyridyl unit providing a site for further coordination. The synthesis, characterization, and X-ray structure determination of trans-[MCl(P∩P)2=C=C=(4,5-diazafluoren-9-yl)]PF6 (M = Ru, P∩P = bis(diphenylphosphino)methane (dppm), 1,2- bis(diphenylphosphino)ethane (dppe), 1,2-bis(dimethylphosphino)ethane (dmpe); M = Os, P∩P = dppm) are described. The effect of the variation in metal and ligand on electronic and electrochemical characteristics of these complexes has been investigated by using UV-vis, solution electrochemistry, and a combination of these techniques in spectroelectrochemical experiments. DFT calculations have been performed on trans-[RuCl(P∩P)2 =C=C=(4,5-diazafluoren-9-yl) q (P∩P = dppm, bis(dimethylphosphino)methane (dmpm); q = -1, 0, + 1, +2) and subsequently solvent-corrected calculations with use of COSMO were also undertaken to examine the nature of electronic transitions in various oxidation states.

    Original languageEnglish
    Pages (from-to)1716-1726
    Number of pages11
    Issue number8
    Publication statusPublished - 28 Apr 2008


    Dive into the research topics of 'Coordinating tectons: Bipyridyl terminated allenylidene complexes'. Together they form a unique fingerprint.

    Cite this