Supramolecular architectures based on p-cymene/ruthenium complexes functionalized with nucleobases

Abstract: The nucleophilic attack of a series of nucleobase derivatives on the [(?6-p-cymene)RuCl(?-Cl)]2 dinuclear entity has yielded four mononuclear complexes with the general formula [Ru(?6-p-cymene)(L)Cl2], in which L stands for cytosine (1), 2-thiouracil (2), hypoxanthine (3) and 5-aminouracil (4). Furthermore, the sieving of chlorido from compound 1, assisted by a mild base, has prompted the formation of a tetranuclear ruthenium cationic complex which crystallizes as [(?6-p-cymene)4Ru4(?-cytosinato-?N1:?N3,O2)4](CF3SO3)4 (compound 5). The crystal structure analysis of compounds 1-4 reveals that the supramolecular packing is dominated by the self-assembly capabilities provided by the stabilized nucleobase-tautomer, which is at the same time dependent on the Ru/nucleobase coordination mode. In this regard, the assembly of the complex units is conducted through base-pairing interactions, and is also assisted by means of nucleobase/chloride hydrogen bonding. The stability of these monomeric entities in water and phosphate buffered solution is analysed by means of 1H- and 31P-NMR. The tetranuclear entity of compound 5 presents an available hydrogen-donor set (exocyclic amino group) but it lacks any available acceptor atom, which prevents the nucleobase mediated self-assembly of the complex units. Consequently, a doubly interpenetrated supramolecular network is woven by the hydrogen bonding between the triflate (CF3SO3-) anions and complex cationic entities.

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 Fuente: CrystEngComm, Vol. 19, Iss. 40, PP 6039-6048 (2017)

Editorial: Royal Society of Chemistry

 Año de publicación: 2017

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

DOI: 10.1039/c7ce01496a

ISSN: 1466-8033

Proyecto español: MAT2016-75883-C2-1-P : MAT2014-55049-R

Url de la publicación: https://doi.org/10.1039/c7ce01496a