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Electrical Conduction through Linear Porphyrin Arrays

2003; American Chemical Society; Volume: 125; Issue: 36 Linguagem: Inglês

10.1021/ja0346429

1943-2984

Dae Hwan Yoon, Sun Bae Lee, Kyung‐Hwa Yoo, Jinhee Kim, Jong Kuk Lim, Naoki Aratani, Akihiko Tsuda, Atsuhiro Osuka, Dongho Kim,

Electrochemical sensors and biosensors

Electrical conduction measurements were made on two extreme types of directly linked porphyrin arrays by using nanoelectrodes. One type is the directly linked Zn(II)porphyrin arrays, consisting of 48 Zn(II)porphyrin moieties (Z48), and the other type is the completely flat, tape-shaped Zn(II)porphyrin arrays, consisting of eight Zn(II)porphyrin units (T8). The I−V curve for Z48 exhibits the diode-like behavior and the hysteresis depending on the voltage sweep direction presumably due to the conformational heterogeneity arising from the dihedral angle distribution in Z48. On the other hand, the I−V curve for T8 is nearly symmetric without any hysteresis, leading to the higher conductivity and the smaller band gap. These results illustrate that the stronger π-electron conjugation in T8, as compared with that of Z48, results in better electrical conduction.