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Inorganic Chemistry, Vol.41, No.19, 4967-4974, 2002
Variation in the coordination mode of arenedisulfonates: Syntheses and structural characterization of mononuclear and dinuclear cadmium(II) arenedisulfonate complexes with two- to zero-dimensional architectures
Seven cadmium(II) arenedisulfonate compounds, namely [Cd(2,2'-bpy)(2)(H2O)(peds)].4H(2)O (1), [Cd-2(2,2'-bpy)(4)(H2O)(2)-(1,5nds)](1,5nds).4H(2)O (2), [Cd(cyclam)(1,5nds)](2) (3), {[Cd(inia)(2)(H2O)(2)(2,6nds)].4H(2)O}(n) (4), {[Cd(inia)(2)(H2O)(2)(bpds)].4H(2)O}(n) (5), {[Cd-2(inia)(4)(H2O)(3)(peds)(2)].2H(2)O}(n) (6), and [Cd(1,5nds)(H2O)(2)](n) (7), where 2,2'-bpy = 2,2'-bipyridyl, cyclam = 1,4,8,11-tetraazacyclotetradecane, inia = isonicotinamide, nds = naphthalenedisulfonate, bpds = 4,4'biphenyldisulfonate, and peds = 4,4'-phenyletherdisulfonate, have been obtained from aqueous solution by using similar procedures and structurally characterized by X-ray single-crystal diffraction, IR spectroscopy, and thermal gravimetric analysis. In 1, the peds anion coordinates as a monodentate ligand, leading to a mononuclear unit. In 2 and 3, the 1,5nds anions coordinate as mu(2)-bridging ligands in different modes, producing charged or neutral dinuclear clusters. In 4 and 5, 2,6nds and bpds behave as mu(2)-spacers, resulting in 1-dimensional polymers. While in 6, the peds acts both as terminal and bridging ligands with the SO3- groups being either monodentate or, mu(2)-bridging, creating a knotted 1-dimensional polymer with dinuclear clusters as the repeating units. In 7, 1,5nds acts as a bridging ligand with each SO3- coordinated as a mu(2)-bridging group to adjacent Cd(II) centers, leading to a 2-dimensional polymer. Together with the reported [Cu(en)(2)(1,5nds)].2H(2)O}(n) (8), all of the six possible coordination modes adopted by organodisulfonate anions, on the assumption that each SO3- group could be monodentate or,mu(2)-bridging, are realized by introducing nitrogen-containing organic ligands as auxiliaries.