Photoaquation of methylated cis-dichlorobis(1,10-phenanthroline)rhodium(III)chloride compounds by direct population of a photoactive triplet excited state.
Photoaquation in compounds II and III by direct excitation into a photoactive triplet excited state is reported. The location of the singlet to triplet transition in compound III is estimated by a combination of the action spectrum for photoaquation in the region between 520 and 600 nm and the phosphorescence spectrum at 77 K. The significant increment of the reactivity (10-fold) of the triplet states in II and III as compared to that in I is explained in terms of increasing sigma-donation from the phen ligands stabilizing the pentacoordinated rhodium intermediate formed by chloride expulsion.
Loganathan
Devanesan
D
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
Rodriguez
Jorge H
JH
Morrison
Harry
H
D008163:Luminescent Measurements; D008745:Methylation; D009942:Organometallic Compounds / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry*; D018462:Photobiology; D010777:Photochemistry; D014867:Water / Q000737:chemistry
D009942:Organometallic Compounds; D010618:Phenanthrolines; C120941:bis(1,10-phenanthroline)rhodium(III); D014867:Water