title: Synthesis, structure, spectroscopic properties and biological activity of mixed diorganotin(IV) complexes containing pyridine-2-carbaldehyde thiosemicarbazonato and diphenyldithiophosphinato ligands.
abstract: Reaction of the title ligands (HPyTSC and HS(S)PPh2, respectively) with R2SnO (R = Me, Et, Bu) in ethanol (EtOH) afforded the complexes [SnMe2(PyTSC) (S2PPh2)].EtOH (1) and [SnR2(PyTSC) (S2PPh2)] (R = Et (2), Bu (3)). The structures of 1 and 2 were determined by single-crystal X-ray diffractometry. In both these complexes the tin atom is coordinated to an N,N,S-dentate thiosemicarbazonate ligand, an anisobidentate dithiophosphinato ligand and the two R groups. The coordination polyhedrons can be described as distorted pentagonal bipyramids. A comparative study of the IR spectra of 1, 2 and 3 indicates that the butyl complex has a similar structure. Multinuclear (1H, 13C, 31P and 119Sn) NMR data suggest that the structures of 1 and 2 probably remain in CDCl3 (or DMSO-d6) solution but compound 3 partially decomposes in these media. Preliminary results on the effects of the complexes on the proliferation and differentiation of FLC, CEM, U937, K562 and TOM-1 leukaemia cells, and on the clonogenic activity of K562 cells are also described.
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Spain. qiscasas@uscmail.usc.es
authors.forename: J S
authors.initials: JS
authors.lastname: Casas
authors.forename: A
authors.initials: A
authors.lastname: Castiñeiras
authors.forename: M C
authors.initials: MC
authors.lastname: Rodríguez-Argüelles
authors.forename: A
authors.initials: A
authors.lastname: Sánchez
authors.forename: J
authors.initials: J
authors.lastname: Sordo
authors.forename: A
authors.initials: A
authors.lastname: Vázquez López
authors.forename: S
authors.initials: S
authors.lastname: Pinelli
authors.forename: P
authors.initials: P
authors.lastname: Lunghi
authors.forename: P
authors.initials: P
authors.lastname: Ciancianaini
authors.forename: A
authors.initials: A
authors.lastname: Bonati
authors.forename: P
authors.initials: P
authors.lastname: Dall'Aglio
authors.forename: R
authors.initials: R
authors.lastname: Albertini
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D018360:Crystallography, X-Ray; D006801:Humans; D020014:K562 Cells; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009947:Organotin Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D013055:Spectrophotometry, Infrared
chemical_list: D008024:Ligands; D009947:Organotin Compounds