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Title: Co-crystals of tetrakis-1,2,3,4-(4′-carboxyphenyl)cyclobutane with dipyridyl spacers: Design and serendipity
Authors: Kole, G.K.
Tan, G.K.
Koh, L.L. 
Vittal, J.J. 
Issue Date: 7-Oct-2012
Citation: Kole, G.K., Tan, G.K., Koh, L.L., Vittal, J.J. (2012-10-07). Co-crystals of tetrakis-1,2,3,4-(4′-carboxyphenyl)cyclobutane with dipyridyl spacers: Design and serendipity. CrystEngComm 14 (19) : 6190-6195. ScholarBank@NUS Repository.
Abstract: Tetrakis-1,2,3,4-(4′-carboxyphenyl)cyclobutane (TCCB), a tetracarboxylic acid, has been employed for making co-crystals with linear dipyridyl spacers molecules like 4,4′-bipyridine (4,4′-bpy), 1,2-bis(4′-pyridyl)ethane (4,4′-bpethane), trans-1,2-bis(4′- pyridyl)ethylene (4,4′-bpe) and 1,4-bis(4′-pyridyl)-2,3-diaza-1,3- butadiene (4,4′-bpdb). In the case of 4,4′-bpy, a 2:1 co-crystal was obtained with TCCB having a three dimensional 5-fold interpenetrated dmp network. The diagonal-diagonal interpenetrated isostructural (4,4)-connected 2D networks were obtained in 1:1 co-crystals of TCCB with 4,4′-bpe and 4,4′-bpdb. The (4,4)-connected nets in the 1:1 co-crystal of TCCB with 4,4′-bpethane were found to stack parallel instead of interpenetrating. 1:1 co-crystals were always obtained in the last three cases regardless of molar ratio during co-crystallization, indicating the influence of kinetic factors. The structural diversity and similarities in this series of co-crystals in the context of composition variation and solvent interference are discussed. The serendipitous formation of (4,4)-connected networks is critically compared with designability of the system in presence of synthon competition. © 2012 The Royal Society of Chemistry.
Source Title: CrystEngComm
ISSN: 14668033
DOI: 10.1039/c2ce25513h
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