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Communication

Correlation between Molecular Orbitals and Doping Dependence of the Electrical Conductivity in Electron-Doped Metal−Phthalocyanine Compounds

Monica F. Craciun,* Sven Rogge, and Alberto F. Morpurgo

Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

J. Am. Chem. Soc., 2005, 127 (35), pp 12210–12211

DOI: 10.1021/ja054468j

Publication Date (Web): August 10, 2005

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

, m.f.craciun@tnw.tudelft.nl

Abstract

We have performed a comparative study of the electronic properties of six different electron-doped metal−phthalocyanine (MPc) compounds (ZnPc, CuPc, NiPc, CoPc, FePc, and MnPc), in which the electron density is controlled by means of potassium intercalation. Despite the complexity of these systems, we find that the nature of the underlying molecular orbitals produces observable effects in the doping dependence of the electrical conductivity of the materials. For all the MPc's in which the added electrons are expected to occupy orbitals centered on the ligands (ZnPc, CuPc, and NiPc), the doping dependence of the conductivity has an essentially identical shape. This shape is different from that observed in MPc materials in which electrons are also added to orbitals centered on the metal atom (CoPc, FePc, and MnPc). The observed relation between the macroscopic electronic properties of the MPc compounds and the properties of the molecular orbitals of the constituent molecules clearly indicates the richness of the alkali-doped metal−phthalocyanines as a model class of compounds for the investigation of the electronic properties of molecular systems.

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Published In Issue September 07, 2005
Received July 6, 2005

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Communication

Correlation between Molecular Orbitals and Doping Dependence of the Electrical Conductivity in Electron-Doped Metal−Phthalocyanine Compounds