title: Photophysical properties of cis-Mo2 quadruply bonded complexes and observation of photoinduced electron transfer to titanium dioxide.
abstract: The compounds cis-Mo2(DAniF)2(L)2 have been prepared, where DAniF = (N,N')-p-dianisyl formamidinate and L = thienyl-2-carboxylate (Th), 2,2'-bithienyl-5-carboxylate (BTh), and 2,2':5',5″-terthienyl-5-carboxylate (TTh). The compounds have been characterized by proton nuclear magnetic resonance ((1)H NMR), ultraviolet-visible (UV-vis) absorption and emission, differential pulse voltammetry, and time-resolved transient absorption and infrared (IR) spectroscopy. An X-ray crystal structure was obtained for the thienyl complex. The related salt [(n)Bu4N]2[Mo2(DAniF)2(TTh-CO2)2], where TTh-CO2 = 2,2':5',2″-terthienyl-5,5″-dicarboxylate, has also been prepared and employed in the attachment of the complex to TiO2 nanoparticles. The latter have been characterized by ground-state Fourier transform infrared spectroscopy (FTIR) and femtosecond time-resolved IR spectroscopy. The time-resolved data provide evidence for sub-picosecond charge injection from the Mo2 center to the semiconducting oxide particle.
authors.affiliation: Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.
authors.forename: Samantha E
authors.initials: SE
authors.lastname: Brown-Xu
authors.forename: Malcolm H
authors.initials: MH
authors.lastname: Chisholm
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Durr
authors.forename: Terry L
authors.initials: TL
authors.lastname: Gustafson
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Spilker