title: Synthesis, characterization and antitumor activity of platinum(II) complexes with diethyl and monoethyl 2-quinolylmethylphosphonates.
abstract: A series of new platinum(II) complexes with diethyl (2-dqmp) and monoethyl (2-Hmqmp) 2-quinolylmethylphosphonates have been prepared and studied. Both organophosphorus ligands by reaction with [PtX(4)](2-) (X=Cl, Br) form either the molecular or ionic complexes depending on the acidity of the reaction solution. Dihalide adducts, trans-[PtL(2)X(2)] (L=2-dqmp, 2-Hmqmp), with N-bonded ligand through the quinoline nitrogen were obtained in the neutral medium, while under acidic conditions at pH<3 were isolated the ion-pair salt complexes, [LH](2)[PtX(4)], containing the protonated quinoline ligand as cation and tetrahaloplatinate complex as anion. In addition, 2-Hmqmp at pH approximately 3.5 forms quinolinium hexahalodiplatinum salt complexes, [2-H(2)mqmp](2)[Pt(2)X(6)], while the chelate complex, [Pt(2-mqmp)(2)].2H(2)O, with N,O-bonded ligand through the quinoline nitrogen and the deprotonated phosphonic acid oxygen was obtained at pH>6. The new complexes were characterized on the basis of elemental and thermogravimetric analyses, conductometric measurements, and by infrared and (1)H NMR spectral studies. As a preliminary assessment of their biological activity, complexes were evaluated for their in vitro cytostatic activity in an epidermoid human carcinoma (KB) and murine leukemia (L1210) cell lines. The results obtained were compared with those obtained for the corresponding Pd(II) complexes.
authors.affiliation: Division of Physical Chemistry, Ruder Bosković Institute, Bijenicka 54, HR-10002 Zagreb, Croatia. tusek@rudjer.irb.hr
authors.forename: Ljerka
authors.initials: L
authors.lastname: Tusek-Bozić
authors.forename: Fabiana
authors.initials: F
authors.lastname: Frausin
authors.forename: Vito
authors.initials: V
authors.lastname: Scarcia
authors.forename: Ariella
authors.initials: A
authors.lastname: Furlani
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009943:Organophosphorus Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D010984:Platinum / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D000970:Antineoplastic Agents; D009943:Organophosphorus Compounds; C032627:methylphosphonic acid; D010984:Platinum