An Electrically Conducting Three‐Dimensional Iron–Catecholate Porous Framework

• Published in: Angewandte Chemie Vol. 133; no. 33; pp. 18213 - 18220
• Main Authors: Mähringer, Andre, Döblinger, Markus, Hennemann, Matthias, Gruber, Christoph, Fehn, Dominik, Scheurle, Patricia I., Hosseini, Pouya, Santourian, Irina, Schirmacher, Alfred, Rotter, Julian M., Wittstock, Gunther, Meyer, Karsten, Clark, Timothy, Bein, Thomas, Medina, Dana D.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 09.08.2021
• Subjects: Absorption; Broadband; Chemistry; Conduction; Conductors; Crystallites; Crystals; Current carriers; Diamonds; Electrical conductivity; Electrical resistivity; Iron; iron-catecholate; Metal-organic frameworks; porosity; Porous materials; Quantum mechanics; three-dimensional framework; Topology
• ISSN: 0044-8249; 1521-3757
• DOI: 10.1002/ange.202102670

We report the synthesis of a unique cubic metal–organic framework (MOF), Fe‐HHTP‐MOF, comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and FeIII ions, arranged in a diamond topology. The MOF is synthesized under solvothermal conditions, yielding a highly crystalline, deep black powder, with crystallites of 300–500 nm size and tetrahedral morphology. Nitrogen sorption analysis indicates a highly porous material with a surface area exceeding 1400 m2 g−1. Furthermore, Fe‐HHTP‐MOF shows broadband absorption from 475 up to 1900 nm with excellent absorption capability of 98.5 % of the incoming light over the visible spectral region. Electrical conductivity measurements of pressed pellets reveal a high intrinsic electrical conductivity of up to 10−3 S cm−1. Quantum mechanical calculations predict Fe‐HHTP‐MOF to be an efficient electron conductor, exhibiting continuous charge‐carrier pathways throughout the structure. Fe‐HHTP‐MOF, a unique cubic metal–organic framework (MOF) comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and FeIII ions arranged in a diamond topology is reported. Fe‐HHTP‐MOF is a highly crystalline, porous and deep black material featuring high electrical conductivity.