Two two‐dimensional supramolecular copper(II) and cobalt(III) complexes derived from a new quinazoline‐type ligand: Syntheses, structures, and spectral, thermal, electrochemical and antimicrobial activity studies

Two two‐dimensional supramolecular copper(II) and cobalt(III) complexes, Cu(L 1 ) 2 ( 1 ; HL 1 = 2‐hydroxy‐3‐methoxybenzaldehyde oxime) and [Co(L 2 ) 2 ] 2 ⋅2CH 3 COOCH 2 CH 3 ( 2 ; HL 2 = 1‐(2‐{[( E )‐3‐methoxy‐2‐hydroxybenzylidene]amino}phenyl)ethanone oxime), have been synthesized via complexation of Cu(II) nitrate trihydrate and Co(II) acetate tetrahydrate with HL. A plausible reaction mechanism for the formation of HL 1 is proposed. HL was synthesized and characterized using infrared, 1 H NMR and 13 C NMR spectra, as well as elemental analysis. Complexes 1 and 2 were investigated using single‐crystal X‐ray diffraction and have a 2:1 ligand‐to‐metal ratio. Different geometric features of both complexes are observed. In their crystal structures, 1 and 2 form infinite two‐dimensional structures and 2 forms a three‐dimensional supramolecular framework. Electron paramagnetic resonance spectra of 1 and 2 were also investigated. Moreover, thermal and electrochemical properties and antimicrobial activity of 2 were also studied. In addition, the calculated HOMO and LUMO energies show the character of complex 1 .