Temperature-assisted formation of reversible metallophilic Au-Ag interaction arrays

  1. Gil-Moles, M. 1
  2. Gimeno, M.C. 2
  3. López-De-Luzuriaga, J.M. 1
  4. Monge, M. 1
  5. Olmos, M.E. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

  2. 2 Universidad de Zaragoza
    info

    Universidad de Zaragoza

    Zaragoza, España

Journal:
Dalton Transactions

ISSN: 1477-9234

Year of publication: 2019

Volume: 48

Number: 16

Pages: 5149-5155

Type: Article

Exportar: RIS
DOI: 10.1039/C9DT00751B PMID: 30924819 SCOPUS: 2-s2.0-85064535645
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Summary

A temperature-controlled self-assembly process in a solution of [Ag(terpy)] n n+ and [Au(C 6 F 5 ) 2 ] − units has been performed. For this, the crystallisation of the complex [{Au(C 6 F 5 ) 2 }Ag(terpy)] n under the same experimental conditions, changing only the temperature, allows the synthesis of polymorphs [{Au(C 6 F 5 ) 2 } 2 Ag 2 (terpy) 2 ] n (2a) at 298 K and [{Au(C 6 F 5 ) 2 }Ag(terpy)] n (2b) at 280 K. The X-ray diffraction studies previously reported for 2a revealed a polymeric structure with an unusual + + − − + + − − charge sequence, whereas for polymorph 2b, a more classical + − + − disposition has been obtained. The conversion of one polymorph into the other can be achieved by simple dissolution of one of them and by recrystallisation at the corresponding temperature. The mechanism of the formation of each polymorph is proposed in view of their 1 H NMR, 1 H-PGSE NMR and molar conductivity measurements.

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