期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 11, 期 14, 页码 4199-4209出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200401225
关键词
calixarenes; host-guest systems; macrocyclic ligands; N ligands; zinc
Based on the efficient combination of calixarene spacers and acetylenic porphyrin derivatives, a new generation of cofacial bis-porphyrins has been synthesized. The first crystal structure of a cofacial bis-porphyrin-calixarene conjugate is reported. Their unique architectural features, analogous to those of pac-man-type bis-porphyrins, allow these calixarene-porphyrin conjugates to adapt their shape to the size of bidentate guests, such as diazabicyclo [2.2.2] octane (dabco) and 1,4-pyrazine. The predefined, cofacial arrangement of the porphyrin moieties observed in the solid state and in solution results in extremely high affinities (in the range of 10(9) m(-1)) for these guests. The 1,3-alternate calixarene conformations afford open-mouth pac-man structures whose ability to bite on nitrogen bidentates depends on their functionalization. A cone conformer provides a much more flexible structure that exhibits the highest affinity for dabco and pyrazine.
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