Two Coordination Polymers Involving Triangular and Linear Trinuclear Co(II) Clusters Created Via In situ Ligand Synthesis

Two novel 3D metal-organic frameworks with cobalt(II) clusters as nodes and mixed bridging ligands as links, {[Co-3(OH)(tbiP)(2)(Htbip)(dps)(dpds)(0.5)]}(n) (1) and {[Co-2 (H2O)(tbip)(2)(dps)]center dot CH3OH center dot 2 H2O}(2n) (2) (dps = 4,4'-dipyridylsulfide, dpds = 4,4'-dipyridyldisulfide, H(2)tbip = 5-tert-butyl isophthalic acid), were obtained from the same reaction mixture but tuned by different hydrothermal temperatures: at 120 degrees C, product 1 is a 3D MOF based on the novel triangular trinuclear cluster node, whereas at 160 degrees C, product 2 is a 3D MOF constructed from both a linear trinuclear cluster node and a mononuclear Co-II node. The starting dpds reagent was partly converted into dps ligand in 1 and wholly transferred into dps in 2 via new in situ cleavage of both S-S and S-C bonds and temperature-dependent in situ ligand rearrangement of dpds.