catena-Poly[[nickel(II)-μ₂-[1,3-bis(imidazol-1-ylmethyl)benzene-κ²N³:N^3′]-μ₂-(5-carboxybenzene-1,3-dicarboxylato-κ⁴O¹,O^1′:O³,O^3′)] 0.41-hydrate]

Abstract

The title compound, {[Ni(C(9)H(4)O(6))(C(14)H(14)N(4))]·0.41H(2)O}(n), exhibits a three-dimensional hydrogen-bonded supramolecular framework. The Ni(II) cation is six-coordinated in a distorted triangular prism defined by two N atoms from two 1,3-bis(imidazol-l-ylmethyl)benzene (bix) ligands and four O atoms from two 5-carboxybenzene-1,3-dicarboxylate (HBTC) dianions. The bix molecules and HBTC dianions both act as bidentate ligands, linking the Ni(II) cations to form a one-dimensional coordination polymer. A two-dimensional wave-like net is constructed by O-H...O hydrogen bonds linking adjacent chains. Partially occupied solvent water molecules fill the cavities and link these layers to form a three-dimensional supramolecular structure via O-H...O hydrogen bonds. The title compound was also characterized by powder X-ray diffraction and thermogravimetric analysis.

Series of Cd(II) and Pb(II) Coordination Polymers Based on a Multilinker (R,S-)2,2′-Bipyridine-3,3′-dicarboxylate-1,1′-dioxide

“…Interestingly, the coordination geometry of Cd(II) corresponds to a slightly distorted triangular prism (Figure b), with four oxygen atoms (O1, O1A, O2, O2A; A = 1 – x , y , 1/2 – z ) comprising the equatorial plane, while the other two oxygen atoms (O6, O6A) from two coordinated water molecules locate at the same side of the plane instead of the usual axial positions. Although recently Alvarez reported that the number of trigonal prisms throughout the six-coordinated transition-metal centers is barely 1.0% in the Cambridge Structural Database (CSD), this geometry is significant for it is observed in the active sites of molybdenum- and tungsten-containing enzymes and may appear as an intermediate or a transition state in the intramolecular racemization reactions. , For coordination polymers, as far as we known, the frequency of Mn(II) trigonal-prismatic structures is slightly high, but such coordination geometry has not been in Cd(II) polymers to date. , This example may make the coordination chemistry of Cd(II) complexes more substantial.…”

“…19,20 For coordination polymers, as far as we known, the frequency of Mn(II) trigonalprismatic structures is slightly high, but such coordination geometry has not been in Cd(II) polymers to date. 21,22 This example may make the coordination chemistry of Cd(II) complexes more substantial. The Cd−O bonds distances vary from 2.262(3) to 2.368(3) Å, and the O−Cd−O angles are in the range from 55.63°to 141.33°, which are similar to previously reported works.…”