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Carbonyl (pyridine) phthalocyaninatoruthenium (II) may be used for "hole- burning" applications.
English (United States)
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"Hole Burning" In A Metal Complex Of Phthalocyanine
Carbonyl (pyridine) phthalocyaninatoruthenium (II) may be used for "hole-
Although not all metal phthalocyanines are expected to produce hole burning,
ones with appropriate axial ligands might be made to exhibit this property. The
subject compound, for example, produces hole burning apparently due to the
presence of the carbonyl ligand. On the other hand, it was found that a similar
system. but with two pyridines, i.e., bis(pyridine) phthalocyaninatoruthenium (II),
produced no hole burning. Although the subject compound can be made to
photoeject the carbonyl at room temperature, it is uncertain whether this is
happening at the lower temperatures (between 1.8 and 10.0 (degrees) K) where
hole burning is observed.
Samples of the subject compound were prepared in a variety of solvents.
Hole burning was observed in 100% ethanol, in mixtures of pyridine and ethanol
and in an aprotic solvent mixture of pyridine and 2-methyltetrahydrofuran. Hole
burning, however, was not observed in pure 2-methyltetrahydrofuran. Thus,
there is also a strong solvent dependence affecting the hole-burning mechanism.
Certain metal phthalocyanines, therefore, appear to be good candidates for hole-
burning applications. Particularly appealing in these systems is their very
intense 0-0 absorption with only minor vibronic absorptions in the remainder of
the visible spectrum.