Structural and photophysical studies on a linear trinuclear zinc complex of 2-[(2-hydroxyethylimino)methyl]quinolin-8-ol |
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| Authors: | Isabel Garcí a-Santos, Jesú s Sanmartí n, Ana M. Garcí a-Deibe, Matilde Fondo,Esther G mez |
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| Affiliation: | aDpto. de Química Inorgánica, Fac. de Farmacia, Univ. de Santiago de Compostela, Campus Sur, Santiago de Compostela 15782, Spain;bDpto. de Química Inorgánica, Fac. de Química, Univ. de Santiago de Compostela, Campus Sur, Santiago de Compostela 15782, Spain;cDpto. de Química Inorgánica, Fac. de Ciencias, Univ. de Santiago de Compostela, Campus Universitario, Lugo 27002, Spain |
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| Abstract: | A linear trinuclear zinc complex was obtained when after refluxing 8-hydroxyquinoline-2-carboxaldehyde and 2-aminoethanol (in a 1:1 molar ratio) until the formation of the H2L ligand, a methanol solution of zinc acetate dihydrate was added. Reaction between Zn(OAc)2·2H2O and H2L, both in 3:2 or 4:2 ratios, yielded Zn3(HL)2(OAc)4. This latter could be crystallographically characterised, and rather surprisingly, the potentially tetradentate HL− is only acting as an O,N-donor, while two phenolate and four acetate bridges hold together the three zinc ions. A study of the luminescence properties in methanol solution showed that the quantum yield of Zn3(HL)2(OAc)4 (ΦF = 0.07) is slightly higher than that of 8-hydroxyquinoline-2-carboxaldehyde (ΦF = 0.06). |
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| Keywords: | 8-Hydroxyquinoline Schiff base Acetate bridge Phenolate bridge Trinuclear complex Photophysical properties |
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