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Metal-Containing Conjugated Polymers
Published in John R. Reynolds, Barry C. Thompson, Terje A. Skotheim, Conjugated Polymers, 2019
Christopher M. Brown, Michael O. Wolf
Structurally interesting, d10 coinage metals can exhibit short metal-metal distances, the most striking of which occur in gold(I) metal complexes where weak Au···Au bonds can be realized due to relativistic effects. This occurrence was termed aurophilicity by Schmidbaur and consists of a bond length around 3.0 Å and a strength of 7–12 kcal/mol, comparable to the strength of a hydrogen bond (Schmidbaur, 2000).
Crystal structures, DNA-binding ability and influence on cellular viability of gold(I) complexes of thiosemicarbazones
Published in Journal of Coordination Chemistry, 2018
Carolane M. Almeida, Gabriel P. Nascimento, Kelly G. Magalhães, Bernardo A. Iglesias, Claudia C. Gatto
Recent and emerging discoveries in medicine are based mainly on the use of metal containing compounds [1]. Gold(I) and gold(III) compounds have been discovered and investigated for the treatment of several diseases, including cancer [2]. Ligand-coordinated gold complexes that exhibit pharmacological application are increasingly being studied for anti-tumor properties similar to cisplatin [3]. Platinum(II) compounds are isoelectronic (d8) and isostructural (square planar geometry) compared to gold(III) compounds. Cisplatin is a metallodrug that has platinum as the central metal. These characteristics lead us to believe that gold(III) compounds with coordination similar to cisplatin may also have biological characteristics similar to cisplatin [4]. While gold(I) complexes do not show square planar geometry, these complexes are of great pharmacological interest because of their potential biological properties and because the reduction of gold(III) to gold(I) can decrease the cytotoxicity [5]. Furthermore, gold(I) compounds exhibit lower steric impediment than gold(III) compounds, facilitating proximity and interactions between metal atoms, and depending on the distance between the two metal centers, these compounds can exhibit aurophilicity, which results from weak gold⋯gold interactions [6–8]. Gold(I) compounds with typical linear geometries also possess an available coordination site and can form agostic or non-classical C–H⋯Au interactions [9–13].