Synthesis, characterization, and properties of [4]cyclo-2,7-pyrenylene: effects of cyclic structure on the electronic properties of pyrene oligomers.

摘要: A cyclic tetramer of pyrene, [4]cyclo-2,7-pyrenylene ([4]CPY), was synthesized from pyrene in six steps and 18% overall yield by the platinum-mediated assembly units subsequent reductive elimination platinum. The structures two key intermediates were unambiguously determined X-ray crystallographic analysis. DFT calculations showed that topology frontier orbitals [4]CPY essentially same as those [8]cycloparaphenylene ([8]CPP), all fully conjugated. electrochemical analyses proved electronic properties to be similar [8]CPP. results are sharp contrast obtained for corresponding linear oligomers which each unit electronically isolated. clearly show a novel effect structure on π-conjugated molecules.