| Abstract |
The self-assembly reaction of arylhydrazones of beta-diketones (AHBD), namely 2-[2-(2,4-dioxopentan-3-ylidene)hydrazinyl]-benzenesulfonic acid (H2L1) and 2-[2-(4,4-dimethyl-2,6-dioxocyclohexylidene)hydrazinyl]benzenesulfonic acid (H2L2), with sodium or potassium hydroxides in MeOH/H2O (1/1, v/v) produces a series of coordination compounds, [Na-3(mu(3)-HL1)(2)(mu(4)-HL1)(mu-H2O)(H2O)(2)](n) (1), [Na-2(HL1)(2)(mu-H2O)(2)(H2O)(4)]center dot 4H(2)O (2), [Na(HL2)(mu-H2O)(H2O)(2)](n). nH(2)O (3), [K(mu(4)-HL1)(mu(3)-H2O)] (4), and [K(mu(4)-HL2)(H2O)](n) (5), which include the one-dimensional (3), two-dimensional (2D) (1, 4), and three-dimensional (3D) (5) coordination polymers, as well as the zero-dimensional dimer (2). Compounds 1-5 were isolated as air stable crystalline solids and characterized by IR, H-1, and C-13\H-1\ NMR spectroscopy, elemental, differential thermal, and single-crystal X-ray diffraction analysis. The latter shows that the monodeprotonated HL1- (L = L-1, L-2) anions act as multiple O-donors through the sulfonate and carbonyl groups and are also capable of simultaneously bridging three and/or four metal cations (in 1, 4, and 5), thus giving rise to the intricate 2D and 3D coordination networks. Their topological analysis reveals the trinodal 3,4,7-connected (in 4) and pentanodal 3,4-connected (in 1) underlying 2D nets with novel types of topologies, as well as the uninodal 4-connected 3D framework with the sra (SrAl2) topology (in 5). |
