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Two New MOFs Based on Cu 2 Paddlewheel Units and Biphenyltetracarboxylate Ligands with a Different Degree of Fluorination
Author(s) -
Stastny Carina,
Ruschewitz Uwe
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800399
Subject(s) - isostructural , crystallography , carboxylate , biphenyl , sorption , crystal structure , materials science , metal organic framework , crystal (programming language) , porosity , chemistry , stereochemistry , organic chemistry , adsorption , computer science , programming language , composite material
Two new MOFs (metal‐organic frameworks), namely 3 ∞ [Cu 2 (H 2 O) 2 (L)] · 3DMF · H 2 O [L = 4‐fluoro‐biphenyl‐3,3′,5,5′‐tetracarboxylate (4 ‐mF ‐BPTC 4– ) and 4,4′‐difluoro‐biphenyl‐3,3′,5,5′‐tetracarboxylate (4,4′‐ dF ‐BPTC 4– )] termed UoC‐1(1F) and UoC‐1(2F) (UoC ≡ University of Cologne), were synthesized by solvothermal reactions in DMF. The crystal structure of UoC‐1(1F) was solved and refined from X‐ray single crystal data ( Imma, Z = 4). The X‐ray powder diffraction data of UoC‐1(2F) confirmed that both MOFs are isostructural. In their crystal structures each of the four carboxylate groups of the BPTC 4– linker is involved in a Cu 2 paddlewheel unit leading to a 3D structure with high porosity, which was confirmed by N 2 gas sorption measurements revealing specific surface areas of S BET = 1256 m 2 · g –1 [UoC‐1(1F)] and 1162 m 2 · g –1 [UoC‐1(2F)] after activation at 120 °C for 72 h. Higher activation temperatures lead to a decomposition of the framework and significantly decreased specific surface areas.