Source:http://linkedlifedata.com/resource/pubmed/id/18855358
Subject | Predicate | Object | Context |
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pubmed-article:18855358 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:18855358 | lifeskim:mentions | umls-concept:C1880194 | lld:lifeskim |
pubmed-article:18855358 | lifeskim:mentions | umls-concept:C0337189 | lld:lifeskim |
pubmed-article:18855358 | lifeskim:mentions | umls-concept:C0441239 | lld:lifeskim |
pubmed-article:18855358 | lifeskim:mentions | umls-concept:C0242414 | lld:lifeskim |
pubmed-article:18855358 | pubmed:issue | 45 | lld:pubmed |
pubmed-article:18855358 | pubmed:dateCreated | 2008-11-6 | lld:pubmed |
pubmed-article:18855358 | pubmed:abstractText | Two new bis-bidentate bridging ligands have been prepared, L (naph) and L (anth), which contain two chelating pyrazolyl-pyridine units connected to an aromatic spacer (naphthalene-1,5-diyl and anthracene-9,10-diyl respectively) via methylene connectors. Each of these reacts with transition metal dications having a preference for octahedral coordination geometry to afford {M 8L 12} (16+) cages (for L (anth), M = Cu, Zn; for L (naph), M = Co, Ni, Cd) which have an approximately cubic arrangement of metal ions with a bridging ligand spanning each of the twelve edges, and a large central cavity containing a mixture of anions and/or solvent molecules. The cages based on L (anth) have two cyclic helical {M 4L 4} faces, of opposite chirality, connected by four additional L (anth) ligands as "pillars"; all metal centers have a meridional tris-chelate configuration. In contrast the cages based on L (naph) have (noncrystallographic) S 6 symmetry, with a diagonally opposite pair of corners having a facial tris-chelate configuration with the other six being meridional. An additional significant difference between the two types of structure is that the cubes containing L (anth) do not show significant interligand aromatic stacking interactions. However, in the cages based on L (naph), there are six five-membered stacks of aromatic ligand fragments around the periphery, each based on an alternating array of electron-rich (naphthyl) and electron-deficient (pyrazolyl-pyridine, coordinated to M (2+)) aromatic units. A consequence of this is that the cages {M 8(L (naph)) 12} (16+) retain their structural integrity in polar solvents, in contrast to the cages {M 8(L (anth)) 12} (16+) which dissociate in polar solvents. Consequently, the cages {M 8(L (naph)) 12} (16+) give NMR spectra in agreement with the symmetry observed in the solid state, and their fluorescence spectra (for M = Cd) display (in addition to the normal naphthalene-based pi-pi* fluorescence) a lower-energy exciplex-like emission feature associated with a naphthyl --> pyrazolyl-pyridine charge-transfer excited state arising from the pi-stacking between ligands around the cage periphery. | lld:pubmed |
pubmed-article:18855358 | pubmed:language | eng | lld:pubmed |
pubmed-article:18855358 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:18855358 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
pubmed-article:18855358 | pubmed:month | Nov | lld:pubmed |
pubmed-article:18855358 | pubmed:issn | 1520-5126 | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:WardMichael... | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:AdamsHarryH | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:CleggWilliamW | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:HardingLindsa... | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:TidmarshIan... | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:RussoLucaL | lld:pubmed |
pubmed-article:18855358 | pubmed:author | pubmed-author:FaustThomas... | lld:pubmed |
pubmed-article:18855358 | pubmed:issnType | Electronic | lld:pubmed |
pubmed-article:18855358 | pubmed:day | 12 | lld:pubmed |
pubmed-article:18855358 | pubmed:volume | 130 | lld:pubmed |
pubmed-article:18855358 | pubmed:owner | NLM | lld:pubmed |
pubmed-article:18855358 | pubmed:authorsComplete | Y | lld:pubmed |
pubmed-article:18855358 | pubmed:pagination | 15167-75 | lld:pubmed |
pubmed-article:18855358 | pubmed:year | 2008 | lld:pubmed |
pubmed-article:18855358 | pubmed:articleTitle | Octanuclear cubic coordination cages. | lld:pubmed |
pubmed-article:18855358 | pubmed:affiliation | Department of Chemistry, University of Sheffield, UK. | lld:pubmed |
pubmed-article:18855358 | pubmed:publicationType | Journal Article | lld:pubmed |