Abstract
A novel one-dimensional zigzag chain-like CoII coordination polymer constructed from 4,4'-bi-pyridine (4,4'-bpy) and 2-hy-droxy-benzoate (2-OHbenz) ligands, namely, catena-poly[[(4,4'-bi-pyridine-κN)-(μ-2-hy-droxy-benzoato-κ2 O:O')(2-hy-droxy-benzoato-κ2 O,O')cobalt(II)]-μ-4,4'-bi-pyridine-κ2 N:N'-[aquahemi(μ-4,4'-bi-pyridine-κ2 N:N')(2-hy-droxy-benzoato-κO(2-hy-droxy-benzoato-κ2 O:O')cobalt(II)], [Co2(C7H5O3)4(C10H8N2)2.5(H2O)] n , has been synthesized by reacting cobalt(II) nitrate trihydrate, 4,4'-bpy and 2-hy-droxy-benzoic acid in a mixture of water and methanol at room temperature. There are two independent CoII centers, Co1 and Co2, in the asymmetric unit, revealing a distorted octa-hedral geometry with chromophore types of [CoN2O4] and [CoN2O3O'], respectively. The Co1 ions are doubly bridged by 2-OHbenz ligands with syn-anti coordination mode, generating a dinuclear unit. The bridging 4,4'-bpy ligands connect these dinuclear units and the mononuclear Co2 chromophores, providing a one-dimensional alternating zigzag chain-like structure. In the crystal, inter-molecular hydrogen bonds, C-H⋯π and π-π stacking inter-actions are observed and these help to consolidate the packing. In addition, the physical properties of the title compound are reported.
Highlights
A novel one-dimensional zigzag chain-like CoII coordination polymer constructed from 4,40-bipyridine (4,40-bpy) and 2-hydroxybenzoate (2-OHbenz) ligands, namely, catena-poly[[(4,40-bipyridine-N)(-2-hydroxybenzoato2O:O0)(2-hydroxybenzoato-2O,O0)cobalt(II)]--4,40-bipyridine-2N:N0-[aquahemi(-4,40-bipyridine-2N:N0)(2-hydroxybenzoato-O(2-hydroxybenzoato2O:O0)cobalt(II)], [Co2(C7H5O3)4(C10H8N2)2.5(H2O)]n, has been synthesized by reacting cobalt(II) nitrate trihydrate, 4,40-bpy and 2-hydroxybenzoic acid in a mixture of water and methanol at room temperature
The Co1 ions are doubly bridged by 2-OHbenz ligands with syn–anti coordination mode, generating a dinuclear unit
The structure–property relationships of hybrid polymeric materials with 4,40-bipyridine (4,40-bipy) have been studied intensively (Biradha et al, 2006; Khrizanforova et al, 2020). This is because 4,40-bpy is a rigid molecule that can link the metal centers to form a network with well-defined structures and support the stability of the structures through
Summary
The design and construction of new coordination polymers (CPs) is of current interest and attracts researchers in the fields of modern structural chemistry and materials science because of their potential applications in areas such as ionexchange, catalysis, sensors, magnetism, and non-linear optics (Dzhardimalieva & Uflyand, 2017; Loukopoulos & Kostakis, 2018; Horike et al, 2020). The structure–property relationships of hybrid polymeric materials with 4,40-bipyridine (4,40-bipy) have been studied intensively (Biradha et al, 2006; Khrizanforova et al, 2020). This is because 4,40-bpy is a rigid molecule that can link the metal centers to form a network with well-defined structures and support the stability of the structures through. We report the synthesis and crystal structure and physical properties of this compound
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