Elucidating the Structure of the Metal-Organic Framework Ru-HKUST-1

Published

September 22, 2020

Author(s)

Gregory R. Lorzing, Krista P. Balto, Alexandra M. Antonio, Benjamin Trump, Craig Brown, Eric D. Bloch

Abstract

Ru-HKUST-1 (Ru₃(btc)₂X_1.5; btc^3– = 1,3,5-benzentricarboxylate; X^–^ = chloride, acetate, trimesate) has received considerable attention as a result of its structure type, tunability, and the redox-active nature of its constituent metal paddlewheel building units. As compared to some of the other members of the HKUST-1 family, its surface area is typically reported as 25% lower than expected. In contrast to this, a related ruthenium-based porous coordination cage, Ru₂₄(^tBu-bdc)₂₄Cl₁₂, displays the expected surface area when compared to Cr²⁺ and Mo²⁺ analogs. Here, we examine the factors that result in this decreased surface area for the MOF. We show that with appropriate solvent exchange and activation conditions, Ru-HKUST-1 can display a B.E.T. surface ar-eas as high as 1439 m²/g. We utilize a combination of spectroscopic and diffraction techniques to accurately determine the structure of the MOF prepared under our conditions, which is most accurately described here as Ru₃(btc)₂(OAc)_1.07Cl_0.43. Further, by simply treating the sample as air-sensitive upon isolation, adsorption selec-tivities toward unsaturated molecules greatly improve.

Citation

Chemistry of Materials

Volume

32

Issue

18

Pub Type

Journals

Keywords

Metal Organic Framework, Gas Adsorption

Citation

Lorzing, G. , Balto, K. , Antonio, A. , Trump, B. , Brown, C. and Bloch, E. (2020), Elucidating the Structure of the Metal-Organic Framework Ru-HKUST-1, Chemistry of Materials (Accessed May 3, 2024)