Journal
SCIENCE ADVANCES
Volume 7, Issue 52, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abk3095
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Funding
- Key Research Program of the Chinese Academy of Sciences [XDPB01]
- National Natural Science Foundation of China [22073109]
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The conjugated macrocycles cycloparaphenylenes (CPPs) exhibit high conductance and large tunneling attenuation coefficient, especially at small ring sizes. Radially pi-conjugated molecular systems offer a larger conductance modulation range than standard linear molecules, making them a potential platform for building molecular devices with highly tunable transport behaviors.
Conjugated macrocycles cycloparaphenylenes (CPPs) have unusual size-dependent electronic properties because of their unique radially pi-conjugated structures. Contrary to linearly pi-conjugated molecules, their highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gap shrinks as the molecular size reduces, and this feature can, in principle, be leveraged to achieve unexpected size-dependent transport properties. Here, we examine charge transport characteristics of [n]CPPs (n = 5 to 12) at the single molecule level using the scanning tunneling microscope-break junction technique. We find that the [n]CPPs have a much higher conductance than their linear oligoparaphenylene counterparts at small ring size and at the same time show a large tunneling attenuation coefficient comparable to saturated alkane series. These results show that the radially pi-conjugated molecular systems can offer much larger conductance modulation range than standard linear molecules and can be a new platform for building molecular devices with highly tunable transport behaviors.
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