Two cobalt(II) coordination polymers, namely {[Co(HO-BDC)(bbe)]·(H 2 O)} n (1), and {[Co(O-BDC)(bbp)]·(H 2 O)} n(2) (HO-H 2 BDC = 5-hydroxyisophthalic acid, bbe = 1,2-bis(benzoimidazol-2-yl)ethane, and bbp = 1,3-bis(benzoimidazol-2-yl)propane) were synthesized under hydrothermal conditions, and characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, 2091 and thermogravimetric analyses. Compound 1 is a 1D chain, whereas 2 is a (3,3)-connected 2D network with (6 3 ) topology. These two 1D and 2D complexes are further connected by hydrogen bonds to form the 3D supramolecular architectures. The electrochemical lithium-ion storage properties of the as-made Co 3 O 4 by calcination of 1 are investigated in detail.
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Results and Discussion
{[Co(HO-BDC)(bbe)]·(H 2 O)} n (1)Single-crystal X-ray diffraction analysis reveals that complex 1 crystallizes in the monoclinic crystal system of P2 1 /n space group. The asymmetric unit of 1 contains an independent Co II cation, one HO-BDC 2anion, one bbe ligand, and one water molecule. As shown in Figure 1, the central ion Co II is tetracoordinated by two nitrogen atoms from one bbe, and two oxygen atoms from two HO-BDC 2ligands. The presence of seven-membered ring and short Co1···O2 [2.572(2) Å] contact let the cobalt atom form a distorted tetrahedral arrangement. All coordinated bond lengths (Co-O 1.948(2) and 1.959(2) Å, Co-N 2.013(3) and 2.053(3) Å) show normal values and are comparable to those in the Co II -polycarboxylate N-donor ligand complexes.
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