A nitrate bridged one-dimensional copper(II) coordination polymer with a tridentate (NNO) Schiff base: synthesis, X-ray structure and catalytic efficacy

• Published in: Transition metal chemistry (Weinheim) 2020-11, Vol.45 (8), p.605-612
• Main Authors: Chowdhury, Habibar, Bera, Rajesh, Rizzoli, Corrado, Adhikary, Chandan
• Format: Article
• Language: English
• Subjects: Acetonitrile; Catalysis; Chemical synthesis; Chemistry; Chemistry and Materials Science; Chromophores; Coordination polymers; Copper; Copper compounds; Crystallography; Epoxidation; Gas chromatography; Imines; Inorganic Chemistry; Nitrates; Organometallic Chemistry; Oxidizing agents; Physical Chemistry; Selectivity; Single crystals; X ray analysis
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-020-00415-7

A one-dimensional Cu(II) coordination polymer of [Cu(L)(μ-ONO 2 )] 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 CuN 2 O 3 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-ONO 2 ) 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.