@article{6a6c0410f02f48f0a57c0132f4899f17,
title = "Chameleonic layered metal-organic frameworks with variable charge-ordered states triggered by temperature and guest molecules",
abstract = "Molecular materials whose electronic states are multiply varied depending on external stimuli are among the most promising targets for the development of multiply accessible molecular switches. Here, we report a honeycomb layer composed of tetraoxolene-bridged iron (Fe) subunits whose charge-ordered states are multiply variable via thermal treatments and solvation/desolvation with the crystallinity intact. The compound is (NPr4)2[Fe2(Cl2An)3] (1-d; NPr4+ = tetra-n-propylammonium; Cl2An2- = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinonate), which possesses three charge-ordered states: A low-temperature (LT) phase [(Fe3+)2(Cl2An2-)(Cl2An3-)2]2-; an intermediate (IM) phase [(Fe2.5+)2(Cl2An2-)(Cl2An2.5-)2]2-; and a high-temperature (HT) phase [(Fe2+)2(Cl2An2-)3]2- that varies according to temperature. In addition, the LT phase of 1-d is reversibly changeable to another IM phase in its solvated compound 1via a solvation/desolvation process at room temperature. This example demonstrates a new multiple-switching system based on electron transfer and host-guest chemistry in a charge-flexible metal-organic framework.",
author = "Jian Chen and Yoshihiro Sekine and Atsushi Okazawa and Hiroyasu Sato and Wataru Kosaka and Hitoshi Miyasaka",
note = "Funding Information: The authors thank Prof. S. Hayami (Kumamoto University) for the helpful discussions on 57Fe M{\"o}ssbauer spectra and Dr K. Sugimoto (JASRI) for the SC-XRD measurements for the IM phase using a synchrotron beam at Spring-8. This work was supported by a Grant-in-Aid for Scientic Research (No. 16H02269, 18K19050, 18K05055, and 18H05208) from MEXT, Japan, and on Innovative Areas (“p-System Figuration” Area 2601, No. 17H05137) from the Japan Society for the Promotion of Science (JSPS), Japan, and the E-IMR project. Y. S. is thankful for nancial support received from the TOBE MAKI Scholarship Foundation and the Shorai Foundation for Science and Technology. J. C. gratefully acknowledges the nancial support received from the Chinese Scholarship Council (CSC) and the Institute for Materials Research, Tohoku University. Publisher Copyright: This journal is {\textcopyright} The Royal Society of Chemistry.",
year = "2020",
month = apr,
day = "14",
doi = "10.1039/d0sc00684j",
language = "English",
volume = "11",
pages = "3610--3618",
journal = "Chemical Science",
issn = "2041-6520",
publisher = "Royal Society of Chemistry",
number = "14",
}