期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 27, 页码 8358-8365出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201200155
关键词
anthracene; capsules; fluorescence; self-assembly; solvatochromism
资金
- Japan Society for the Promotion of Science (JSPS)
- Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) [21108011]
- global COE program (GCOE) Education and Research Center for Emergence of New Molecular Chemistry
- Grants-in-Aid for Scientific Research [12J04743, 21108011, 24108101] Funding Source: KAKEN
An isostructural series of M2L4 molecular capsules quantitatively self-assembled from two MII ions (M=Zn, Cu, Pt, Pd, Ni, Co, and Mn) and four bent ligands with embedded anthracene fluorophores. X-ray crystallographic analysis (for M=Zn, Cu, Ni, and Pd) confirmed the formation of closed-shell structures in which the large interior cavities inside the molecular capsules (about 1 nm) were shielded by eight anthracene panels. Analysis of the ZnII and CuII structures showed the inclusion of an unusual triad guest cluster; four MeCN molecules, one water molecule, and one CF3SO3- ion were located inside the cavities. Full characterization by NMR spectroscopy and MS (ESI-TOF) demonstrated that the molecular capsules were quite stable and persist in solution. The fluorescence properties of the isostructural capsules were strongly dependent on the identity of the metal species: the ZnII capsule emitted strong blue fluorescence with a high quantum yield (F=0.8), in sharp contrast to the weakly emissive NiII and MnII capsules and the completely non-emissive PdII, PtII, and CoII capsules. On the other hand, the CuII capsule exhibited solvatochromism and solvent-dependent emission behavior; blue emission of the capsule was on in DMSO but off in MeCN.
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