Tuning supramolecular aurophilic structures: the effect of counterion, positive charge and solvent

João Carlos dos Santos Silva E Pereira de Lima, Elisabet Aguilo, Raquel Gavara, Marta Guitart, Clara Baucells, Jordi Llorca, Laura Rodriguez

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The synthesis of the cationic gold(I) complexes [Au(CuCC5H4N)(CH3-PTA)] X (X = I, 1; X = OTf, 4), [Au(C equivalent to CC5H4N-CH3)(PTA)] X (X = I, 2; X = OTf = 5; PTA = 1,3,5-triaza-7-phosphatricyclo[3.3.1.13.7]decane) and [Au(CuCC5H4N-CH3)(DAPTA)] X (X = I, 3; X = OTf = 6, DAPTA = 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[ 3.3.1]nonane) results in cationic complexes with unexpected supramolecular assemblies in water ranging from rod-like structures (1) to vesicles (2 and 3) and square-like structures (5 and 6). These morphologies are completely different from the fibers previously obtained with their parent neutral complexes [Au(C equivalent to C5H4N)(PTA)] and [Au(C equivalent to C5H4N)(DAPTA)]. Nevertheless, the introduction of triflate as a counterion in 1 (complex 4) gives rise to the formation of a highly soluble complex in water which does not display any significant aggregation in solution. These results reveal the importance of the introduction of a positive charge on global supramolecular assemblies and how the counterion can also modify the resulting package. Interestingly, we have also proved that the aggregation of complexes 2, 3, 5 and 6 is also affected by the solvent with direct influence on their absorption and emission properties and the global morphology of the aggregates.
Original languageEnglish
Pages (from-to)7328-7339
JournalDalton Transactions
Volume45
Issue number17
DOIs
Publication statusPublished - 2016

Keywords

  • ALKYL CHAIN-LENGTH
  • ALKYNYLGOLD(I) COMPLEXES
  • SPECTROSCOPIC PROPERTIES
  • PHOTOPHYSICAL PROPERTIES
  • GOLD(I) COMPLEXES
  • SOLID-STATE
  • WATER
  • 1,3,5-TRIAZA-7-PHOSPHAADAMANTANE
  • LIGANDS

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