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
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China.
University of Chinese Academy of Science, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2020 Nov 16;59(47):20873-20878. doi: 10.1002/anie.202009253. Epub 2020 Sep 8.
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 Pm 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 , and the electrical conductivity is 2.7×10 S cm 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.
合成并表征了三维结晶良好的金属有机框架（MOF），即M-THBQ（M = Fe、Co、Mn，THBQ = 四羟基苯醌）。根据粉末X射线衍射数据确定其结构为Pm群中的立方晶胞，并对其电子、磁性和光谱性质进行了研究。它们均为半导体，Fe-THBQ表现出空气稳定的n型热电特性，其塞贝克系数达到-130 μV K，300 K时的电导率为2.7×10 S cm。此外，M-THBQ是顺磁性的，Fe-THBQ的魏斯常数为-219.37 K，表明存在强烈的分子内反铁磁交换。同时，它们在220至1000 nm范围内显示出强吸收带，表明M-THBQ有可能成为光吸收剂，根据紫外吸收边缘光谱，Fe-THBQ的带隙为0.63 eV。
