title: Picosecond time-resolved infrared spectroscopic investigation into electron localisation in the excited states of Re(i) polypyridyl complexes with bridging ligands.
abstract: Mono- and binuclear complexes of (Re(CO)3Cl) with dipyrido[2,3-a:3',2'-c]-6,7-dimethylphenazine (ppbMe2) were synthesised and their photophysical properties probed using picosecond time-resolved infrared spectroscopy (TRIR). Excitation of these complexes in solution at 400 nm produces short-lived excited states. The IR spectrum of the excited state of the mononuclear [Re(CO)3Cl(ppbMe2)] have nu(CO) bands shifted to higher wavenumber relative to those of the ground state. This is consistent with formation of a (3)MLCT excited state. The IR spectrum of the excited state of the bimetallic [(Re(CO)3Cl)2(micro-ppbMe2)] shows the formation of two distinct groups of nu(CO) bands. This is interpreted as the formation of two distinct Re sites arising from a localised MLCT state with formally oxidised Re centre and a formally reduced bridging ligand. The nu(CO) bands of the adjacent Re centre are affected by the reduction of the bridging ligand. On the IR timescale the excited state structure is best formulated as [Cl(CO)3Re(II)(micro-ppbMe2 *-)Re(I)(CO)3Cl].
authors.affiliation: School of Chemistry, University of Nottingham, University Park, Nottingham, UK.
authors.forename: Marina K
authors.initials: MK
authors.lastname: Kuimova
authors.forename: Keith C
authors.initials: KC
authors.lastname: Gordon
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Howell
authors.forename: Pavel
authors.initials: P
authors.lastname: Matousek
authors.forename: Anthony W
authors.initials: AW
authors.lastname: Parker
authors.forename: Xue-Zhong
authors.initials: XZ
authors.lastname: Sun
authors.forename: Michael
authors.initials: M
authors.lastname: Towrie
authors.forename: Michael W
authors.initials: MW
authors.lastname: George
mesh_terms: D004583:Electrons; D008024:Ligands; D008027:Light; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000528:radiation effects; D010619:Phenazines / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry* / Q000528:radiation effects; D012211:Rhenium / Q000737:chemistry* / Q000528:radiation effects; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013997:Time Factors
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010619:Phenazines; D011725:Pyridines; C509720:dipyrido(2,3-a-3',2'-c)-6,7-dimethylphenazine; D012211:Rhenium