title: Solvent dependent photophysics of fac-[Re(CO)(3)(11,12-X(2)dppz)(py)](+)(X = H, F or Me).
abstract: The photophysical properties of [Re(CO)(3)(dppz)(py)](+) (dppz = dipyrido-[3,2-a:2',3'-c] phenazine) and its 11,12 substituted derivatives [Re(CO)(3)(dppzMe(2))(py)](+) and [Re(CO)(3)(dppzF(2))(py)](+) have been examined in organic and aqueous environments using phosphorescence and picosecond transient visible and infrared absorption spectroscopic methods. The roles of the intraligand IL(pi-pi*) and metal-to-ligand charge transfer MLCT(phz) excited states are evaluated and used to explain the major effect of difluoro-substitution, which is particularly remarkable in water, where the excited state of [Re(CO)(3)(dppzF(2))(py)](+) is strongly quenched.
authors.affiliation: School of Chemistry, University of Nottingham, University Park, Nottingham, UK.
authors.forename: Joanne
authors.initials: J
authors.lastname: Dyer
authors.forename: Caitriona M
authors.initials: CM
authors.lastname: Creely
authors.forename: J Carlos
authors.initials: JC
authors.lastname: Penedo
authors.forename: David C
authors.initials: DC
authors.lastname: Grills
authors.forename: Sarah
authors.initials: S
authors.lastname: Hudson
authors.forename: Pavel
authors.initials: P
authors.lastname: Matousek
authors.forename: Anthony W
authors.initials: AW
authors.lastname: Parker
authors.forename: Michael
authors.initials: M
authors.lastname: Towrie
authors.forename: John M
authors.initials: JM
authors.lastname: Kelly
authors.forename: Michael W
authors.initials: MW
authors.lastname: George