Photoinduced electron transfer and charge recombination can be studied in metal-polypyridine polynuclear complexes based on the (MebpyCH2CH2Mebpy) (Me, methyl; bpy,2,2′-bipyridine) bridging ligand. An example is provided by the binuclear complex [Ru(Me2phen)2(MebpyCH2CH2Meb py)Rh(Me2bpy)2]5+ (phen, 1,10-phenanthroline) (abbreviated as Ru(II)Rh(III)). In this system, photoinduced electron transfer processes originating from both local excited states (*Ru(II)Rh(III)→Ru(III)Rh(II) and Ru(II)*Rh(III)→Ru(III)Rh(II)), as well as charge recombination (Ru(III)Rh(II)→Ru(II)Rh(III)), have been resolved in the nanosecond and picosecond time domains using transient absorption and emission measurements. An energy transfer process (Ru(II)*Rh(III)→*Ru(II)Rh(III) can also be observed in rigid media, where the competing electron transfer process is suppressed. The factors affecting the kinetics of the various electron transfer steps can be discussed in terms of current transfer theories. Polychromophor...
Photoinduced energy and electron transfer in inorganic covalently linked systems
SCANDOLA, Franco;ARGAZZI, Roberto;BIGNOZZI, Carlo Alberto;INDELLI, Maria Teresa
1994
Abstract
Photoinduced electron transfer and charge recombination can be studied in metal-polypyridine polynuclear complexes based on the (MebpyCH2CH2Mebpy) (Me, methyl; bpy,2,2′-bipyridine) bridging ligand. An example is provided by the binuclear complex [Ru(Me2phen)2(MebpyCH2CH2Meb py)Rh(Me2bpy)2]5+ (phen, 1,10-phenanthroline) (abbreviated as Ru(II)Rh(III)). In this system, photoinduced electron transfer processes originating from both local excited states (*Ru(II)Rh(III)→Ru(III)Rh(II) and Ru(II)*Rh(III)→Ru(III)Rh(II)), as well as charge recombination (Ru(III)Rh(II)→Ru(II)Rh(III)), have been resolved in the nanosecond and picosecond time domains using transient absorption and emission measurements. An energy transfer process (Ru(II)*Rh(III)→*Ru(II)Rh(III) can also be observed in rigid media, where the competing electron transfer process is suppressed. The factors affecting the kinetics of the various electron transfer steps can be discussed in terms of current transfer theories. Polychromophor...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
