Synthesis and crystal structure of di-chlorido-(1,10-phenanthroline-κ2N, N')gold(III) hexa-fluorido-phosphate

Raphael Enoque Ferraz de Paiva; Douglas Hideki Nakahata; Pedro Paulo Corbi

doi:10.1107/S2056989017008763

Synthesis and crystal structure of di-chlorido-(1,10-phenanthroline-κ²N, N')gold(III) hexa-fluorido-phosphate

Acta Crystallogr E Crystallogr Commun. 2017 Jun 16;73(Pt 7):1048-1051. doi: 10.1107/S2056989017008763. eCollection 2017 Jul 1.

Authors

Raphael Enoque Ferraz de Paiva¹, Douglas Hideki Nakahata¹, Pedro Paulo Corbi¹

Affiliation

¹ Institute of Chemistry, University of Campinas - UNICAMP, Campinas - SP, Brazil.

Abstract

A gold(III) salt of composition [AuCl₂(C₁₂H₈N₂)]PF₆ was prepared and characterized by elemental and mass spectrometric analysis (ESI(+)-QTOF-MS), ¹H nuclear magnetic resonance measurements and by single-crystal X-ray diffraction. The square-planar coordination sphere of Au^III comprises the bidentate 1,10-phenanthroline ligand and two chloride ions, with the Au^III ion only slightly shifted from the least-squares plane of the ligating atoms (r.m.s. = 0.018 Å). In contrast to two other previously reported Au^III-phenantroline structures that are stabilized by inter-actions involving the chlorido ligands, the packing of the title compound does not present these features. Instead, the hexa-fluorido-phosphate counter-ion gives rise to anion⋯π inter-actions that are a crucial factor for the crystal packing.

Keywords: 1,10-phenanthroline ligand; anion-π interactions; crystal structure; gold(III); square-planar coordination.

Grants and funding

This work was funded by Fundação de Amparo à Pesquisa do Estado de São Paulo grants 2015/25114-4 and 2015/20882-3. Conselho Nacional de Desenvolvimento Científico e Tecnológico grant 140466/2014-2 to Raphael Enoque Ferraz de Paiva.