Details

Autor(en) / Beteiligte

• Wu, Xiaoyu
• Qiu, Yi
• Chen, Zhijun
• Guan, Bo
• Hao, Xiang
• Rykov, Alexandre I.
• Sun, Yimeng
• Liu, Liyao
• Zou, Ye
• Sun, Junliang
• Xu, Wei
• Zhu, Daoben

Titel

Paramagnetic Conducting Metal–Organic Frameworks with Three‐Dimensional Structure

Ist Teil von

• Angewandte Chemie, 2020-11, Vol.132 (47), p.21059-21064

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• 3D well‐crystallized metal–organic frameworks (MOFs), M‐THBQ (M=Fe, Co, Mn, THBQ=tetrahydroxybenzoquinone), are synthesized and characterized. Their structures are determined as cubic cell in the group of Pm3‾ from powder X‐ray diffraction data, and their properties of electronic, magnetic and spectroscopic are also investigated. They are all semiconductors, and Fe‐THBQ exhibits the air‐stable n‐type thermoelectric characteristic as its Seebeck coefficient reaches −130 μV K−1, and the electrical conductivity is 2.7×10−4 S cm−1 at 300 K. Additional, M‐THBQ are paramagnetic, and the value of Weiss constant of Fe‐THBQ is −219.37 K, indicating the existence of robust intramolecular antiferromagnetic exchanges. Meanwhile, they display strong absorption bands in the range of 220 to 1000 nm, suggest M‐THBQ could have the potential to become photoabsorbers, and Fe‐THBQ exhibits a narrow band gap of 0.63 eV according to the ultraviolet absorption edge spectrum. Three MOFs with high crystallinity were synthesized from the conjugated ligand tetrahydroxybenzoquinone (THBQ) and Fe, Co, Mn metal ions. Fe‐THBQ has a negative Seebeck coefficient and the highest electrical conductivity in THBQ‐based MOFs, which could be due to the FeII/FeIII mixed valence. Strong absorptions in the visible light region provide the possibility of application in the light‐harvesting devices.