Download MendeleyExcited-state dynamics of structurally characterized [ReI(CO)3(phen)(HisX)]+ (X = 83, 109) Pseudomonas aeruginosa azurins in aqueous solution.
Busby, M., Gradinaru, C., Crane, B.R., Di Bilio, A.J., Matousek, P., Towrie, M., Leigh, B.S., Richards, J.H., Vlcek, A., Gray, H.B.(2006) J Am Chem Soc 128: 4365-4370
- PubMed: 16569013
- DOI: https://doi.org/10.1021/ja057451+
- Primary Citation of Related Structures:
2FNW - PubMed Abstract:
The triplet metal-to-ligand charge transfer ((3)MLCT) dynamics of two structurally characterized Re(I)(CO)(3)(phen)(HisX)-modified (phen = 1,10-phenanthroline; X = 83, 109) Pseudomonas aeruginosa azurins have been investigated by picosecond time-resolved infrared (TRIR) spectroscopy in aqueous (D(2)O) solution. The (3)MLCT relaxation dynamics exhibited by the two Re(I)-azurins are very different from those of the sensitizer [Re(I)(CO)(3)(phen)(im)](+) (im = imidazole). Whereas the Re(I)(CO)(3) intramolecular vibrational relaxation in Re(I)(CO)(3)(phen)(HisX)Az (4 ps) is similar to that of [Re(I)(CO)(3)(phen)(im)](+) (2 ps), the medium relaxation is much slower ( approximately 250 vs 9.5 ps); the 250-ps relaxation is attributable to reorientation of D(2)O molecules as well as structural reorganization of the rhenium chromophore and nearby polar amino acids in each of the modified proteins.
Organizational Affiliation:
School of Biological and Chemical Sciences, Queen Mary, University of London, UK.
