pH-dependent photophysical behavior of rhenium complexes containing hydroxypyridine ligands.
Data related to the pH-dependent photophysics of a class of rhenium complexes containing the hydroxypyridine ligand are presented. Data include ground-state pK(a) values, emission energies, and lifetimes. The complexes all have ground-state pK(a) values near 7.0 and exhibit a dramatic change in emission intensity near this pH. The lifetimes of these complexes, however, are constant over this pH range. A model is presented to account for the observed photophysical behavior. The pH-dependent emission properties of these species make them good candidates for luminescence-based pH probes, especially in the environmental and biomedical fields.
Bare
William D
WD
Randolph-Macon Woman's College, Department of Chemistry, Lynchburg, Virginia 24503, USA.
Mack
Nathan H
NH
Demas
J N
JN
Degraff
B A
BA
D006863:Hydrogen-Ion Concentration; D007834:Lasers; D008163:Luminescent Measurements; D015335:Molecular Probes / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D010777:Photochemistry / Q000379:methods*; D011725:Pyridines / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D012211:Rhenium / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D013057:Spectrum Analysis / Q000379:methods*
D015335:Molecular Probes; D011725:Pyridines; C014047:hydroxypyridines; D012211:Rhenium