A pair of chiral Cu(II)‐Tb(III)‐Fe(III) heterotrimetallic enantiomers: Structural, luminescent, and magnetic studies

Abstract

One chiral heterotrimetallic compound, [Cu(H2O){(R,R)‐valcy}Tb(CH3OH)2(H2O)(μ‐CN)Fe(CN)5]·[Cu(H2O){(R,R)‐valcy}Tb(CH3OH)1.5(H2O)1.5(μ‐CN)Fe(CN)5]·7.85H2O·2CH3OH (1) (H2(R,R)‐valcy = N,N′‐bis(3‐methoxysalicylidene)‐1R,2R‐1,2‐diaminocyclohexane), has been prepared and structurally characterized by X‐ray single‐crystal diffraction. In 1, the asymmetric trinuclear {CuIITbIIIFeIII} units are assembled into 1‐D supramolecular single chain by hydrogen‐bonds and the supramolecular chains are further connected into 2D sheets. Magnetic studies show overall weak ferromagnetic interaction and magnetic anisotropy. The enantiomer of 1, denoted as complex 2, derived from N,N′‐bis(3‐methoxysalicylidene)‐1S,2S‐1,2‐diaminocyclohexane was also synthesized and characterized by PXRD, Infrared spectra, CD spectra, and fluorescence spectra. The results indicated that complexes 1 and 2 are isomorphous exhibiting similar fluorescence properties.

Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

“…As the coating surface was eroded, the fluorescence on the coating surface gradually decreased. It proved that the quenching reaction caused by the H 2 O and Cl À ions reduced the of the characteristic fluorescence peaks significantly [43].…”