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Cobalt‐Based 3D Metal–Organic Frameworks: Useful Candidates for Olefin Epoxidation at Ambient Temperature by H 2 O 2
Author(s) -
Sen Rupam,
Saha Debraj,
Mal Dasarath,
Brandão Paula,
Lin Zhi
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300560
Subject(s) - chemistry , cobalt , olefin fiber , catalysis , intramolecular force , metal organic framework , ethylene , metal , dimer , hydrogen , medicinal chemistry , polymer chemistry , stereochemistry , inorganic chemistry , organic chemistry , adsorption
Two new 3D metal–organic frameworks (MOF), [Co(H 2 ‐DHBDA)(bpe)] n ( 1 ) and [Co(H 2 ‐DHBDA)(bpee)] n ( 2 ) [H 2 ‐DHBDA = 2,5‐dihydroxy‐1,4‐benzenediacetate, bpe = 1,2‐bis(4‐pyridyl)ethylene, bpee = 1,2‐bis(4‐pyridyl)ethane], were synthesized hydrothermally. Both compounds have a similar 3D structure. The secondary building unit is a Co 2 dimer with a Co ··· Co distance of 4.02 Å. The hydroxy groups remain free on the surface of the compounds, and they participate in the intramolecular hydrogen bonding. A detailed structural analysis revealed that the structure is a 7‐c uninodal net with the Schläfli symbol 3 3 .4 13 .5 4 .6 and the vertex symbol [3.3.3.4.4.4.4.4.4.4.4.4.4.4.4.*.*.*.*.*.*]. The compound is catalytically active towards epoxidation reactions in heterogeneous medium with H 2 O 2 as an oxidant. They catalyze the epoxidation of almost all types of olefinic substrates with good efficiency. After the reaction, the catalysts can be recovered quite easily, and they can be used for further reactions without any loss of activity for several cycles.