title: Coordination chemistry of 6-thioguanine derivatives with cobalt: toward formation of electrical conductive one-dimensional coordination polymers.
abstract: In this work we have synthetized and characterized by X-ray diffraction five cobalt complexes with 6-thioguanine (6-ThioGH), 6-thioguanosine (6-ThioGuoH), or 2'-deoxy-6-thioguanosine (2'-d-6-ThioGuoH) ligands. In all cases, these ligands coordinate to cobalt via N7 and S6 forming a chelate ring. However, independently of reagents ratio, 6-ThioGH provided monodimensional cobalt(II) coordination polymers, in which the 6-ThioG(-) acts as bridging ligand. However, for 2'-d-6-ThioGuoH and 6-ThioGuoH, the structure directing effect of the sugar residue gives rise to mononuclear cobalt complexes which form extensive H-bond interactions to generate 3D supramolecular networks. Furthermore, with 2'-d-6-ThioGuoH the cobalt ion remains in the divalent state, whereas with 6-ThioGuoH oxidation occurs and Co(III) is found. The electrical and magnetic properties of the coordination polymers isolated have been studied and the results discussed with the aid of DFT calculations, in the context of molecular wires.
authors.affiliation: Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Amo-Ochoa
authors.forename: Simone S
authors.initials: SS
authors.lastname: Alexandre
authors.forename: Samira
authors.initials: S
authors.lastname: Hribesh
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Galindo
authors.forename: Oscar
authors.initials: O
authors.lastname: Castillo
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Gómez-García
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Pike
authors.forename: José M
authors.initials: JM
authors.lastname: Soler
authors.forename: Andrew
authors.initials: A
authors.lastname: Houlton
authors.forename: Félix
authors.initials: F
authors.lastname: Zamora
authors.forename: Ross W
authors.initials: RW
authors.lastname: Harrington
authors.forename: William
authors.initials: W
authors.lastname: Clegg
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D004553:Electric Conductivity; D008958:Models, Molecular; D011108:Polymers / Q000737:chemistry; D013866:Thioguanine / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D011108:Polymers; D003035:Cobalt; D013866:Thioguanine