title: Synthesis, characterisation and biological properties of gold(III) compounds with modified bipyridine and bipyridylamine ligands.
abstract: Square planar gold(III) complexes that contain functionalised bipyridine ligands of general formula [Au(N--N)Cl(2)][PF(6)] [where N--N = 2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine, 4,4'-dimethoxy-2,2'-bipyridine and 4,4'-diamino-2,2'-bipyridine] have been prepared and characterised by NMR spectroscopy and mass spectrometry. Two of the complexes have also been characterised in the solid state by X-ray crystallography. In addition, a gold(iii) compound bearing a dipyridin-2-ylamine ligand was also prepared and characterised. The complexes were found to undergo hydrolysis under pseudo-physiological conditions. Moreover, the complexes showed moderate to good cytotoxicity in vitro towards the A2780 human ovarian carcinoma cell line and the cisplatin resistant variant A2780cisR. Reactivity studies with biomolecules, such as reducing agents, plasmid DNA and a model protein (ubiquitin) were also performed to provide tentative insights into the mode of action of the complexes.
authors.affiliation: Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. angela.casini@epfl.ch
authors.forename: Angela
authors.initials: A
authors.lastname: Casini
authors.forename: Mariam Celine
authors.initials: MC
authors.lastname: Diawara
authors.forename: Rosario
authors.initials: R
authors.lastname: Scopelliti
authors.forename: Shaik Mohammed
authors.initials: SM
authors.lastname: Zakeeruddin
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Dyson
mesh_terms: D000588:Amines / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D006046:Gold / Q000737:chemistry*; D006801:Humans; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D015394:Molecular Structure; D050607:Organogold Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D011725:Pyridines / Q000737:chemistry*; D013329:Structure-Activity Relationship
chemical_list: D000588:Amines; D000970:Antineoplastic Agents; D008024:Ligands; D050607:Organogold Compounds; D011725:Pyridines; D006046:Gold