Highly Porous Ionic Solids Consisting of AuCo Complex Anions and Aqua Metal Cations.

Inorg Chem

Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.

Published: August 2021

AI Article Synopsis

  • Treatment of Na[AuCo(d-pen)] with M(OAc) in water results in ionic crystals with a highly porous 3D framework, featuring approximately 80% porosity due to hydrogen-bonding between anions and cations.
  • Soaking these crystals leads to the formation of a 1D porous framework with about 60% porosity, where anions and cations are linked via coordination and hydrogen bonds.
  • Continued soaking transforms the structure into a denser framework (around 30% porosity), with the process yielding a very dense final product with only about 5% porosity, which shows significant adsorption capacities for various gases.

Article Abstract

Treatment of Na[AuCo(d-pen)] (Na[]; d-Hpen = d-penicillamine) with M(OAc) (M = Ni, Mn) in water gave ionic crystals of [M(HO)][] () in which [] anions are hydrogen-bonded with [M(HO)] cations to form a 3D porous framework with a porosity of ca. 80%. Soaking crystals of in its mother liquor afforded crystals of [Ni(HO)][{Ni(HO)}()] () in which [] anions are connected to -[Ni(HO)] and [Ni(HO)] cations through coordination and hydrogen bonds, respectively, to form a 1D porous framework with a porosity ca. 60%. Further soaking crystals led to [{Ni(HO)}()] (), in which [] anions are connected to -[Ni(HO)] and -[Ni(HO)] cations through coordination bonds in a dense framework with a porosity of ca. 30%. A similar two-step crystal-to-crystal transformation mediated by solvent proceeded when crystals of were soaked in a mother liquor. However, the transformation of generated [{Mn(HO)}(H)] () as the final product, in which [H] anions are connected to -[Mn(HO)] cations through coordination bonds in a very dense framework with a porosity ca. 5% by way of [Mn(HO)][{Mn(HO)}()] (), which is isostructural with . While all the compounds adsorbed HO and CO depending on the degree of their porosity, unusually large NH adsorption capacities were observed for and , which have dense frameworks.

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Source
http://dx.doi.org/10.1021/acs.inorgchem.1c01877DOI Listing

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