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Construction of preorganized uracil based polytopic tectons for hydrogen-bonded supramolecular architectures

AuthorsChakraborty, Sourav; Sanz Miguel, Pablo J.
Issue Date2012
CitationJournal of Molecular Structure 1015: 99-105 (2012)
AbstractSeveral polytopic ligands decorated with 1-methyluracil moieties at their ends have been synthesized in high yield. Single crystal X-ray diffraction analyses of bis-uracil conjugate (bis(1-methyluracilyl-5yl-)4-nitrobenzyl methane, 2) and tetra-uracil conjugate (1,3-bis[di(1-methyluracilyl)methyl] benzene, 3) indicate presence of distinctly different hydrogen bonding patterns in the supramolecular framework. While self-assembly of 2 utilizes a wobble type (mismatch) self-pairing, no base-pairing interaction of any kind is observed in the packing of tetra-uracil conjugate 3. In the latter case, the presence of an acyclic water trimer reinforces the supramolecular framework. However, in the presence of HClO 4, molecules of 3 are again associated via wobble (mismatched) complimentary self-base pairing. 3 represents the first nucleobase based tetratopic ligand till date. Investigation, as to how the hydrogen bonded supramolecular framework is affected on increasing the number of hydrogen-bonding pendants, is reported here. © 2012 Elsevier B.V. All rights reserved.
Identifiersdoi: 10.1016/j.molstruc.2012.02.012
issn: 0022-2860
Appears in Collections:(ISQCH) Artículos
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