کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1311314 | 975310 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Structural and spectroscopic studies on some metal complexes of an 8-hydroxyquinoline derivative Structural and spectroscopic studies on some metal complexes of an 8-hydroxyquinoline derivative](/preview/png/1311314.png)
Mononuclear metal complexes of 2-[(2-hydroxyethylimino)methyl]quinolin-8-ol (H2L) were obtained by reaction of 8-hydroxyquinoline-2-carboxaldehyde, 2-aminoethanol and the corresponding metal(II) acetate (M = Co, Ni, Cu, Zn or Cd) in 2:2:1 molar ratios. The Schiff base ligand is acting as a monodeprotonated O,N,N-donor in the helical complex Ni(HL)2, which could be crystallographically characterised. This crystal structure contains homochiral chains of Ni(HL)2 connected through double O–H⋯O connections, which relate both non-coordinated hydroxy groups of the ethanolic arms with both phenolic O atoms of a neighbouring complex, in a “head-to-tail” disposition. A study of the luminescence properties in methanol solution showed that the quantum yields of Zn(HL)2·H2O (ΦF = 0.02) and Cd(HL)2·H2O (ΦF = 0.04) are lower than that of 8-hydroxyquinoline-2-carboxaldehyde (ΦF = 0.06).
Single crystal X-ray diffraction studies on the helical complex Ni(HL)2 evidence that the monodeprotonated 8-hydroxyquinoline-based ligand is acting as an O,N,N-donor. The luminescence properties revealed that Cd2+, Zn2+, Cu2+, Co2+ and Ni2+ induce varying degrees of fluorescence quenching.Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 363, Issue 1, 4 January 2010, Pages 193–198