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Synthesis and Characterization of Highly Conductive Cobalt Phthalocyanine-Based Metal–Organic Framework
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DOI：10.1002/aelm.70452.png)
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Abstract
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This paper reports the synthesis of Co-phthalocyanine-based metal–organic frameworks (CoPc-MOFs) via a simple thermal polymerization process. CoPc-MOFs, along with other MPc-MOFs (M: metal), are leading candidates for a Lieb lattice, one of Dirac materials, and theoretically predicted to exhibit unique electronic structures that combine Dirac bands with flat bands near the Fermi level. In particular, CoPc-MOF is predicted to have the smallest energy gap among MPc-MOFs, indicating that CoPc-MOF has potential as a novel organic semiconductor. This paper first reports on the crystal structure and fundamental physical properties, including the electronic structure of octacyano CoPc (CoPc(CN)8), the precursor to CoPc-MOF. Next, the crystal and chemical structures of the synthesized CoPc-MOFs were investigated. Notably, transmission electron microscopy (TEM) confirmed the square-lattice images of CoPc-MOF. The CoPc-MOF pellet demonstrates electrical conductivity approximately two thousand times higher than that of CoPc(CN)8. This result indicates that CoPc-MOF has a two-dimensional π-electron system, consistent with the prediction that CoPc-MOF is a semiconductor with a narrow energy gap due to its Lieb lattice-like structure. The synthesis and properties of CoPc(CN)8 and CoPc-MOF reported in this paper are expected to contribute to fundamental research on the Lieb lattice as novel electronic and magnetic functional materials.
Keywords:
Co-phthalocyanine
fes lattice
Lieb lattice
metal–organic framework
narrow-gap semiconductor
thermal polymerization
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