1. Metal-Ion Metathesis in Metal-Organic Frameworks: A Synthetic Route to New Metal-Organic Frameworks
- Author
-
Soonsang Hong, Yonghwi Kim, Kimoon Kim, Srinivasan Natarajan, Minyoung Yoon, Min Gyu Kim, Sunirban Das, and Saurav Bhattacharya
- Subjects
Models, Molecular ,Molecular Structure ,Surface Properties ,Chemistry ,Magnetic Phenomena ,Metal ions in aqueous solution ,Organic Chemistry ,Inorganic chemistry ,Tricarboxylic Acids ,General Chemistry ,Crystallography, X-Ray ,Metathesis ,Catalysis ,Ion Exchange ,Metal ,Magnetization ,Adsorption ,Metals, Heavy ,visual_art ,Organometallic Compounds ,visual_art.visual_art_medium ,Metal-organic framework ,Porosity ,Powder diffraction - Abstract
A porous metal-organic framework, Mn(H(3)O)[(Mn(4)Cl)(3)(hmtt)(8)] (POST-65), was prepared by the reaction of 5,5',10,10',15,15'-hexamethyltruxene-2,7,12-tricarboxylic acid (H(3)hmtt) with MnCl(2) under solvothermal conditions. POST-65(Mn) was subjected to post-synthetic modification with Fe, Co, Ni, and Cu according to an ion-exchange method that resulted in the formation of three isomorphous frameworks, POST-65(Co/Ni/Cu), as well as a new framework, POST-65(Fe). The ion-exchanged samples could not be prepared by regular solvothermal reactions. The complete exchange of the metal ions and retention of the framework structure were verified by inductively coupled plasma-atomic emission spectrometry (ICP-AES), powder X-ray diffraction (PXRD), and Brunauer-Emmett-Teller (BET) surface-area analysis. Single-crystal X-ray diffractions studies revealed a single-crystal-to-single-crystal (SCSC)-transformation nature of the ion-exchange process. Hydrogen-sorption and magnetization measurements showed metal-specific properties of POST-65.
- Published
- 2012