Structural versatility of seven copper(II) coordination polymers constructed with the long flexible ligand 1,4-bis(1,2,4-triazol-1-yl)butane

The assembly reaction of 1,4-bis(1,2,4-triazol-1-yl)butane (btb) with different Cu(II) salts yields five coordination polymers: a 1D linear chain [Cu(btb)(HCOO)(2)(H2O)(2)](n) (1), a 2D (4, 4) network [Cu(btb)(2)Cl-2](n) (2), a 3D cubic network [Cu(btb)(NCS)(2)](n) (3), a threefold interpenetrating 3D diamondoid network {[Cu(btb)(2)(H2O)(2)](ClO4)(2)}(n) (4) and {[Cu(btb)(2)(H2O)(2)](NO3)(2)}(n) (5). 1 further constructs a 3D hydrogen bonding network. Two coordination polymers [Cu(btb)(1,2-bdc)](n) (6) and {[Cu-2(btb)(btec)(H2O)(3)]0.5H(2)O center dot CH3OH](n) (7) were obtained with btb, 1,2-benzenedicarboxylate (1,2-bdc) and 1,2,4,5-benzenetetracarboxylate (btec). 6 is a 4-connected 6(5).8-CdS 3D coordination network. 7 is a (3,4,5)-connected pillared-layer 3D porous network where [Cu-2(btb)(btec)(H2O)(3)] 2D layers are interlinked by btb pillars. The thermal stability of 1-7 was investigated. 3 and 6 are paramagnets with a negligible magnetic interaction while antiferromagnetic coupling between Cu(II) ions is observed in 7.