일 시 : 2012년 7월 4일, 4:30 PM
장 소 : 503동 504호

-Abstract-
In recent studies we have employed ligand derivatives incorporating polypyridyl and both β-diketonato as well as β,δ-triketonato ligand domains for the construction of a wide range of unusual supramolecular structures.1-4 For example, bis-β-diketonato derivatives in which the β-diketone fragments are linked via a 1,3- or 1,4-substituted aryl group, or by corresponding pyridyl, bipyridyl or biphenylene groups, have been employed to construct new neutral dinuclear platforms, dinuclear helices, trinuclear-triangles and tetranuclear tetrahedrons. In the case of Cu(II), several of the platform species have been linked via a range of difunctional bridging ligands to yield both new discrete as well as framework materials.

Based on the design principles elucidated during the above studies, a range of further oligonuclear supramolecular entities based on related aryl-linked bis(triketone) ligands and polypyridyl ligands have been synthesised. The results serve to exemplify both the extraordinary supramolecular diversity and novelty that is possible using these extended ligand types. Discrete linear, triangular and interwoven products have been isolated. These include unusual mixed metal Ni(II)/Cu(II) cyclic hexanuclear species,3 mixed metal Ni(II)/Cu(II)/La(III) pentanuclear species and an unprecedented interwoven octanuclear Fe(III) species incorporating an unprecedented "universal 3-ravel" motif.