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Título: | Construction of preorganized uracil based polytopic tectons for hydrogen-bonded supramolecular architectures |
Autor: | Chakraborty, Sourav; Sanz Miguel, Pablo J. CSIC ORCID | Fecha de publicación: | 2012 | Editor: | Elsevier | Citación: | Journal of Molecular Structure 1015: 99-105 (2012) | Resumen: | Several 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. | URI: | http://hdl.handle.net/10261/64430 | DOI: | 10.1016/j.molstruc.2012.02.012 | Identificadores: | doi: 10.1016/j.molstruc.2012.02.012 issn: 0022-2860 |
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