Two- and three-fold interpenetrated metal-organic frameworks from one-pot crystallization.
Two different three-dimensional interpenetrating metal-organic frameworks, {[Co(bpe)(muco)](DMF)(H 2O)} n ( 1) and {[Co(bpe)(muco)(H 2O) 2].4(H 2O)} n ( 2) [bpe = 4,4'-bipyridyl ethylene, H 2-muco = trans,trans-muconic acid, DMF = dimethyl formamide] have been co-crystallized in one-pot reaction. This work offers some insights into the intricacy of designing coordination polymers with variable interpenetration, showing new modes of entanglements. Single crystal X-ray diffraction analyses reveal that the compound 1 has a highly distorted cubic (alpha-Po) net with 2-fold interpenetrated structures while compound 2 displays a 3-fold interpenetrating net-work with an unprecedented 6 (6) topology which is different from other well-known 4-connected nets such as diamond or hexagonal diamond. Despite varied interpenetrations, both compounds retain open channels, filled with aggregated guest solvent molecules. As far as the ratios of Co/muco/bpe are concerned, these two complexes can be considered as supramolecular isomers. Formation of a particular isomer in major quantity can be obtained by varying the countercation of the muconate salt in different solvents, by layering, and by changing the order of the components.
Mir
Mohammad Hedayetullah
MH
Department of Chemistry, Faculty of Science, 3 Science Drive 3, National University of Singapore, Singapore.
Kitagawa
Susumu
S
Vittal
Jagadese J
JJ