Topological diversity in copper aromatic meta-dicarboxylate coordination polymers with bis(pyridylformyl)piperazine coligands |
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| Authors: | Zachary M Wilseck |
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| Institution: | Lyman Briggs College, Department of Chemistry, Michigan State University, East Lansing, MI 48825, USA |
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| Abstract: | Hydrothermal synthesis has afforded divalent copper coordination polymers containing bis(4-pyridylformyl)piperazine (4-bpfp) tethers and aromatic meta-dicarboxylate ligands. {Cu(ip)(4-bpfp)]·2H2O}n (1, ip = isophthalate) possesses a (4, 4) rectangular grid structure with an unusual ABCD stacking pattern along a 41 screw axis. Sterically bulky substituents in the 5-position of the isophthalate ligands reduced the coordination polymer dimensionality, with Cu2(tBuip)2(4-bpfp)(H2O)2]n (2, tBuip = 5-tert-butylisophthalate) and {Cu(MeOip)(HMeOip)2(4-bpfp)]·3H2O}n (3, MeOip = 5-methoxyisophthalate) displaying 1D polymeric ladder and chain motifs, respectively. Compound 3 possesses a rare twofold interpenetrated binodal supramolecular hms net with (63)(698) topology. Longer meta-disposed acetate pendant arms induced a doubly interpenetrated 3D primitive cubic topology in {Cu2(1,3-phda)2(H2O)2(4-bpfp)]}n (4, 1,3-phda = 1,3-phenylenediacetate), which possesses antiferromagnetically coupled {Cu2O2} kernels (J = −6.14(8) cm−1). |
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| Keywords: | Copper Coordination polymer Antiferromagnetism Hydrogen bonding |
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