Bioorganometallics: First examples of cyclometalated iridium(III) complexes containing di- and tripeptide ester ligands |
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Authors: | Marion Graf,Karlheinz Sü nkel |
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Affiliation: | Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany |
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Abstract: | The synthesis of bis-cyclometalated [Ir(ptpy)2(gly-gly-OEt)] (2, ptpy = 2-(p-tolyl)pyridinato; gly-gly-OEt = glycylglycine ethyl ester) and [Ir(ptpy)2(gly-gly-gly-OEt)] (3, gly-gly-gly-OEt = glycylglycylglycine ethyl ester) from the reaction of [{Ir(μ-Cl)(ptpy)2}2] (1) with the corresponding peptide ester hydrochlorides in the presence of NaOMe is described. The molecular structure of 2 was confirmed by a single-crystal X-ray diffraction study. The compound crystallized from dichloromethane/iso-hexane in the space group P21/a. In the crystal packing the molecules of 2 exhibit N–H?O hydrogen bonds to the neighbor molecules to form dimeric units. The absorption and emission spectra of 2 and 3 were recorded and exhibit these compounds as strong green-emitting complexes. |
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Keywords: | Cyclometalated complexes Iridium complexes Peptide ester complexes X-ray structure determination Phosphorescent emitter |
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