Copper(II)-salicylaldehydate/-methoxy(pyridine-2-yl)methanolate complexes via in-situ hydrolysis of Schiff bases

Add time:07/11/2019    Source:sciencedirect.com

Reaction of copper(II) nitrate with N-2-(R-pyridyl)salicylaldimine affords the mononuclear bis[salicylaldehydato-κO,O′]copper(II) (1) via acidic hydrolysis of the aldimine ligand back to the salicylaldehyde. Similarly, reaction with (R)-N-1-(p-BrC6H4)ethyl-salicylaldimine or (R)-1-(p-BrC6H4)-N-((pyridin-2-yl)methylene)ethanamine in presence of 2,2′-bipyridine (bipy) provides the mixed-ligated dinuclear bis[(µ-salicylaldehydato-κO,O′:O′)(2,2′-bipyridine)nitrato-copper(II)] (2) or bis[{µ-methoxy(pyridine-2-yl)methanolato-κN,O:O}(methanol)nitrato-copper(II)] (3). The structures of 2 and 3 consist of a dinuclear unit involving two (bipy)(salicylaldehydate)- or {methoxy(pyridine-2-yl)methanolate}(methanol)-coordinated copper(II) cations and two nitrate anions. The coordination sphere of copper is of N2O4-type with an elongated octahedron due to the Jahn-Teller effect in 2. The axial positions of the square bipyramid are occupied by the oxygen atoms from NO3− and the phenoxo group of the nearest salicylaldehydate molecule. The coordination sphere of copper is of NO4-type in 3, with the alkoxido group of methoxy(pyridine-2-yl)methanolate bridging between the Cu atoms. Cyclic voltammograms for 1 demonstrate two quasi-reversible one electron charge transfer processes for [Cu(L)2]2−/[Cu(L)2]− and [Cu(L)2]−/[Cu(L)2] (L = salicylaldehydato), respectively in acetonitrile. DSC analyses reveal an irreversible phase transformation from solid to solid-liquid mixture phase, and then to an isotropic liquid phase for 1. The excited state properties of 1 studied by DFT/TDDFT are comparable to the experimental electronic spectrum.

We also recommend Trading Suppliers and Manufacturers of Ethyl 2-(6-Methoxy-3-pyridyl)-2-oxoacetate (cas 1280197-11-6). Pls Click Website Link as below: cas 1280197-11-6 suppliers

Prev:New ionic liquids with the bis[bis(pentafluoroethyl)phosphinyl]imide anion, [(C2F5)2P(O)]2N−—Synthesis and characterization
Next:Spectroscopic investigations (FT-IR, UV, 1H and 13C NMR) and DFT/TD-DFT calculations of potential analgesic drug 2-[2-(dimethylamino)ethyl]-6-methoxy-4-(pyridin-2-yl)-1(2H)-phthalazinone)