摘要
Four binuclear and one polymeric silver complex of octaaza Schiff-base cryptands were synthesized by [2 + 3] condensation of tris(3-aminopropyl)amine (trpn) or tris(2-aminoethyl)amine (tren) with 5-R-2-methoxy-1,3-benzenedicarboxaldehyde (R = OCH3, CH3, Br or Ph) in the presence of excess of Ag1 ion. The polynucleating and extended coordination nature of the trpn-derived cryptand L1 (R = OCH3) was established by X-ray structure of [{Ag(Ag2L1)}n][(ClO4) 3·2CH3CN·CH3OH·2H 2O]n. The polymeric cation [{Ag (Ag2L1)}n] can be described as the bridge-twisted binuclear (Ag2L1) units linked together by silver atoms via a linear N - Ag - N bridging bonding mode in alternate (inward, outward) conformations relative to the benzene rings, resulting in an infinite single helical chain. The benzene rings in the helix chain are almost parallel to each other, with a π - π stacking distance of 3.84 Å. The coordination behaviour of cryptands have also been studied by NMR spectroscopy in solution.
源语言 | 英语 |
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页(从-至) | 453-461 |
页数 | 9 |
期刊 | Polyhedron |
卷 | 16 |
期 | 3 |
DOI | |
出版状态 | 已出版 - 1997 |
已对外发布 | 是 |