Synthesis of N-(4-Salicylideneiminoaryl)monoaza Crown Ethers and Dioxygen Affinities of Their Cobalt(II) Complexes

【Abstract】 The Schiff base containing pendant monoaza crown ether HL 1, HL 2, HL 3 and HL 4 have been synthesized by condensation of salicylaldehyde with N (4 aminoaryl)monoaza crown ethers, which were prepared conveniently from 4 nitro N,N di(hydroxyethyl)aniline or 4 nitrobenzyl chloride via cyclization or condensation and reduction. The structures of HL 1—HL 4 were verified by 1H NMR, IR spectra, MS and elemental analysis. Moreover, the oxygenation constants ( K O 2 ) and thermodynamic parameters (Δ H 0 and Δ S 0) of their cobalt(II) complexes were determined in the range of -5 ℃ to 25 ℃, and the effect of crown ring bonded to a Schiff base on the dioxygen affinities of cobalt(II) complexes was also observed as compared to the uncrowned analogue (CoL 5 2).更多还原