A nitrate bridged one-dimensional copper(II) coordination polymer with a tridentate (NNO) Schiff base: synthesis, X-ray
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A nitrate bridged one‑dimensional copper(II) coordination polymer with a tridentate (NNO) Schiff base: synthesis, X‑ray structure and catalytic efficacy Habibar Chowdhury1 · Rajesh Bera2 · Corrado Rizzoli3 · Chandan Adhikary4 Received: 25 May 2020 / Accepted: 18 July 2020 © Springer Nature Switzerland AG 2020
Abstract A one-dimensional Cu(II) coordination polymer of [Cu(L)(μ-ONO2)]n (1) (HL = 4-methoxy-2-[1-(methylaminoethylimino) methyl]-phenol) with bidentate bridging nitrate has been isolated and characterized by X-ray diffraction analysis and spectroscopic studies. Single crystal X-ray analysis revealed that each copper(II) center in the asymmetric unit of complex 1 adopts a distorted square pyramidal geometry with a CuN2O3 chromophore ligated through a tridentate Schiff base (L) with (NNO) donor sets and two O atoms of bridging nitrate ion. The adjacent copper atoms are connected by bridging nitrate (μ-ONO2) in bidentate fashion affording a 1D coordination polymeric chain structure along the crystallographic b-axis. In the polymeric framework, the Cu…Cu separation is 4.3749(4) Å. The catalytic efficacy of complex 1 was studied in a series of solvents for the epoxidation of cyclooctene using tert-butyl-hydroperoxide (TBHP) as an efficient oxidant under mild conditions. The catalytic reaction mixture was analyzed by gas chromatography and the data indicated that the yield of the epoxidation reaction and its selectivity is maximum in acetonitrile medium.
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11243-020-00415-7) contains supplementary material, which is available to authorized users. * Chandan Adhikary [email protected] Habibar Chowdhury [email protected] Rajesh Bera [email protected] Corrado Rizzoli [email protected] 1
Department of Chemistry, Kabi Nazrul College, Murarai, Birbhum, West Bengal 731 219, India
2
Department of Chemistry, Dinabandhu Andrews College, Kolkata, West Bengal 700084, India
3
Departimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Parco Area delle Scienze 17/A, 43124 Parma, Italy
4
Department of Chemistry, Institute of Education (P.G.) for Women, Chandernagore, Hooghly, West Bengal 712138, India
Coordination polymers (CPs) [1] and metal–organic frameworks (MOFs) [2] through strong metal–ligand covalent bonds [3] and multiple weak non-covalent forces [4] have attracted great attention of many research groups in the isolation of different advanced functional materials [5–9]. Single-pot synthesis [10] is an efficient synthetic approach using judiciously chosen metal ions, organic ligands and bridging units in pre-assigned molar ratios to isolate such target materials. Cu(II), a 3d9 ion, affords [11] a variety of geometries that may lead to significant differences in overall molecular and crystalline architectures and thereby produce different biological and catalytic activities [12]. The copper ion also finds significant use in bioinorganic chemistry [
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