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  Global Journal of Inorganic Chemistry. Volume 2, Issue 1 (2011) pp. 39-76
  Review Article
Luminescent alkynyl gold(I) complexes: Structures, properties and applications
  Laura Rodrígueza*, João Carlos Limab  
a de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
b REQUIMTE, Departamento de Química, Centro de Química Fina e Biotecnologia, Universidade Nova de Lisboa, Quinta da Torre, 2825 Monte de Caparica, Portugal

  A great number of alkynyl gold(I) complexes that exhibit luminescence are reported in this work. The absorption and emission data are collected and summarized in order to create a useful tool for the scientists that work in this area. In general, UV-Vis spectra are attributed to be originated mainly from alkynyl-centred ?-?*(C=CR) transitions as well as charge transfer transitions between alkynyl ligands and metal ions or ancillary ligands. Alkynyl gold(I) complexes are often strongly emissive, in particular in the solid state, and the emission energies were shown to be red-shifted as the degree of aggregation of the complexes increased. Nevertheless, the state responsible for the observed emission is difficult to assign in some cases due to the influence of the gold(I) atom and its capability to form of metal•metal interactions (aurophilicity). These interactions have attracted a growing attention and accelerated the development of gold(I) chemistry and have been a motif of discussion of several authors in which concerns the assignment of the state responsible for the emission of the compounds. In this review we have grouped the luminescent alkynyl gold(I) complexes in three different classes: phosphane, dialkynyl and isocyanide derivatives. These discrete molecules could also form more complex structures such as rings, catenanes, polymers, calixarenes, etc, that are also analysed here. Finally, an overview of applications of these compounds is also included, highlighting interesting properties displayed by them that, in some cases, have not been explored.
  Gold(I); Alkynyl; Luminescence; Aurophilicity; Applications  

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