Luminescent gold-silver complexes derived from neutral bis(perfluoroaryl) diphosphine gold(i) precursors

  1. Bojan, R.V. 1
  2. Czerwieniec, R. 3
  3. Laguna, A. 2
  4. Lasanta, T. 1
  5. López-De-Luzuriaga, J.M. 1
  6. Monge, M. 1
  7. Olmos, M.E. 1
  8. Yersin, H. 3
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Instituto de Nanociencia y Materiales de Aragón
    info

    Instituto de Nanociencia y Materiales de Aragón

    Zaragoza, España

    ROR https://ror.org/031n2c920

  3. 3 University of Regensburg
    info

    University of Regensburg

    Ratisbona, Alemania

    ROR https://ror.org/01eezs655

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Revista:
Dalton Transactions

ISSN: 1477-9226

Año de publicación: 2013

Volumen: 42

Número: 12

Páginas: 4267-4277

Tipo: Artículo

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DOI: 10.1039/C2DT32973E SCOPUS: 2-s2.0-84874439797 WoS: WOS:000315351800022 GOOGLE SCHOLAR

Otras publicaciones en: Dalton Transactions

Resumen

Complex [Au{4-C6F4(4-C6BrF 4)}(tht)] reacts with diphosphines (L-L) such as bis(diphenylphosphino)methane (dppm) or 1,2-bis(diphenylphosphino)benzene (dppb) in a 2:1 molar ratio in dichloromethane, leading to neutral products of stoichiometry [(Au{4-C6F4(4-C6BrF 4)})2(μ-L-L)] (L-L = dppm (1), dppb (2)). In the crystal structure of complex 2 short Au⋯Au interactions of 2.9367(5) and 2.9521(5) Å appear. This complex displays an orange emission, which is assigned to arise from a charge transfer transition from a metal centered Au-Au orbital to an orbital located at the diphosphine ligand. Addition of silver trifluoroacetate to these complexes in a 1:1 or a 2:1 molar ratio generates polymeric heterometallic gold-silver compounds of stoichiometry [Ag 2Au2{4-C6F4(4-C6BrF 4)}2(CF3CO2)2(μ-L-L)] n (L-L = dppm (3), dppb (4)), which confirms the capability of the neutral [(Au{4-C6F4(4-C6BrF4)}) 2(μ-diphosphine)] units to act as electron density donors when treated with a Lewis acid substrate. These heterometallic derivatives show blue emissions indicating large HOMO-LUMO band gaps, due to the stabilization that the gold-based HOMO orbitals suffer when the electron withdrawing silver trifluoroacetate fragments interact with them. This journal is © 2013 The Royal Society of Chemistry.