| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2004: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2003: ¥10,500,000 (Direct Cost: ¥10,500,000)
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| Research Abstract |
The large ring size of expanded porphyrins encourages the possibility of the formation of related multi-metal complexes. Along this line, we examined the Cu(II) metalation of an octaphyrin, which led to the formation of bis-Cu(II) octaphyrin quantitatively. Interestingly, the heating of this bis-Cu(II) octaphyrin resulted in the splitting into two Cu(II) porphyrins. We named this interesting reaction as a molecular mitosis. This reaction is accompanied by a large spectral change, which may be used in memory devices We thus made a film composed of bis0Cu(II) octaphyrin that was found to be more robust against the thermal splitting than in solution.
We also examined the Cu(II)-metalation of a decaphyrin, which led to the isolation of two tris-Cu(II) decaphyrins that were found to show very unique structures, in which the edged two Cu(II) ions are coordinated within a hemi-porphyrin-like tetrapyrrolic ligand, while the central Cu(II) ion is coordinated with only pyrrolic nitrogen atoms, constituting a very rare case.
We also examined the size-selective synthesis of expanded porphyrins with a tripyrrane as a starting substrate. From this reaction, we isolated rubyrin, nonaphyrin, dodecaphyrin, some of which were found to be useful as an anion sensing agent.
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