کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1340600 | 979742 | 2008 | 11 صفحه PDF | دانلود رایگان |
Thirteen complexes of three isomeric bibenzodiazines were prepared and X-ray crystal structures were determined for seven of these. It is shown that 2,2′-biquinazoline prefers to form mononuclear complexes with chelation involving the less hindered nitrogen donors. Complexes of 4,4′-biquinazoline failed to provide suitable crystals for X-ray structure determination. 2,2′-Biquinoxaline is shown to offer two modes of coordination; in the first it acts as a “stepped-linear” bridging ligand using the two less hindered nitrogens, while in the second mode it chelates to copper(I) centres using its more hindered nitrogens. The presence of the fused benzo rings leads to a higher propensity for π–π stacking of the heterocyclic ligands within such complexes.
Thirteen complexes of three isomericbi benzodiazines were prepared and X-ray crystal structures were determined for seven of these. It is shown that 2,2′-biquinazoline prefers to form mononuclear complexes with chelation involving the less hindered nitrogen donors. 2,2′-Biquinoxaline is shown to offer two modes of coordination; in the first, it acts as a “stepped-linear” bridging ligand using the two less hindered nitrogens, while in the second mode it chelates to copper(I) centres using its more hindered nitrogens. The presence of the fused benzo rings leads to a higher propensity for π–π stacking of the heterocyclic ligands within such complexes.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 27, Issue 5, 7 April 2008, Pages 1527–1537