1 : 2 Adducts of copper(I) halides with 1,2-bis(di-2-pyridylphosphino)ethane: solid state and solution structural studies and antitumour activity.
The 1 : 2 adducts of copper(I) halides with 1,2-bis(2-pyridylphosphino)ethane (d2pype) have been synthesized and solution properties characterized by variable temperature (1)H, (31)P and (65)Cu NMR spectroscopy. Single-crystal structure determinations for the chloride, bromide and iodide complexes show these to crystallize from acetonitrile in the triclinic space group P1 as isostructural centrosymmetric dimers [(d2pype)Cu(mu-d2pype)(2)Cu(d2pype)]X(2).(solvent) with a approximately 12.6, b approximately 12.7, c approximately 15.3 A, alpha approximately 84, beta approximately 67, gamma approximately 84 degrees. In contrast to the analogous AuCl:2(d2pype) and AgNO(3):2(d2pype) adducts, in solution these CuX:2(d2pype) adducts (where X = Cl, Br and I) exist almost exclusively as bis-chelated monomeric [Cu(d2pype)(2)]X; evidence for an equilibrium between monomeric and dimeric forms is detected only for the CuCl adduct in methanol. Cytotoxicity studies in two human breast cancer lines and two matched liver progenitor cell lines indicate that [Cu(d2pype)(2)]Cl is non selectively toxic to both non-tumourigenic and tumourigenic cells. However, the analogous Au(I) compound [Au(d2pype)(2)]Cl, is toxic to highly tumourigenic cells and more selective in its toxicity to tumourigenic cells compared to non-tumourigenic cells. The significance of these results to the further development of selective, mitochondria-targeted, Au(I) antitumour complexes is discussed.
Bowen
Richard J
RJ
School of Biomolecular and Physical Sciences, Griffith University, Brisbane, 4111, Queensland, Australia.
Navarro
Maribel
M
Shearwood
Anne-Marie J
AM
Healy
Peter C
PC
Skelton
Brian W
BW
Filipovska
Aleksandra
A
Berners-Price
Susan J
SJ
D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D045744:Cell Line, Tumor; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004980:Ethane / Q000737:chemistry*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation
D000970:Antineoplastic Agents; D056831:Coordination Complexes; D003300:Copper; D004980:Ethane