A Dual‐Ligand Porous Coordination Polymer Chemiresistor with Modulated Conductivity and Porosity

• Published in: Angewandte Chemie International Edition Vol. 59; no. 1; pp. 172 - 176
• Main Authors: Yao, Ming‐Shui, Zheng, Jia‐Jia, Wu, Ai‐Qian, Xu, Gang, Nagarkar, Sanjog S., Zhang, Gen, Tsujimoto, Masahiko, Sakaki, Shigeyoshi, Horike, Satoshi, Otake, Kenichi, Kitagawa, Susumu
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 02.01.2020
• Edition: International ed. in English
• Subjects: Conductivity; Coordination polymers; Gas sensors; Ligands; Metal-organic frameworks; Nanotechnology; Nanowires; Organic chemistry; Polymers; Porosity; porous coordination polymers; Quinones; semiconductors; Topology; nanowires; porous coordination polymers; semiconductors; gas sensors; metal-organic frameworks
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.201909096

Single‐ligand‐based electronically conductive porous coordination polymers/metal–organic frameworks (EC‐PCPs/MOFs) fail to meet the requirements of numerous electronic applications owing to their limited tunability in terms of both conductivity and topology. In this study, a new 2D π‐conjugated EC‐MOF containing copper units with mixed trigonal ligands was developed: Cu3(HHTP)(THQ) (HHTP=2,3,6,7,10,11‐hexahydrotriphenylene, THQ=tetrahydroxy‐1,4‐quinone). The modulated conductivity (σ≈2.53×10−5 S cm−1 with an activation energy of 0.30 eV) and high porosity (ca. 441.2 m2 g−1) of the Cu3(HHTP)(THQ) semiconductive nanowires provided an appropriate resistance baseline and highly accessible areas for the development of an excellent chemiresistive gas sensor. Makes sense: As two ligands offer more opportunity than one to tune MOF conductivity and topology, a 2D π‐conjugated copper‐based electronically conductive MOF with two different trigonal organic ligands was developed (see structure). The semiconductivity and high porosity of the resulting nanowires provided a low conductivity baseline and highly accessible surface areas, thus resulting in excellent room‐temperature chemiresistive sensing properties.