Solvent dependent photophysics of fac-[Re(CO)(3)(11,12-X(2)dppz)(py)](+)(X = H, F or Me).
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.
Dyer
Joanne
J
School of Chemistry, University of Nottingham, University Park, Nottingham, UK.
Creely
Caitriona M
CM
Penedo
J Carlos
JC
Grills
David C
DC
Hudson
Sarah
S
Matousek
Pavel
P
Parker
Anthony W
AW
Towrie
Michael
M
Kelly
John M
JM
George
Michael W
MW