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

One chiral heterotrimetallic compound, [Cu(H2O){(R,R)-valcy}Tb(CH3OH)(2)(H2O)(mu-CN)Fe(CN)(5)]center dot[Cu(H2O){(R,R)-valcy}Tb(CH3OH)(1.5)(H2O)(1.5)(mu-CN)Fe(CN)(5)]center dot 7.85H(2)O center dot 2CH(3)OH (1) (H-2(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 {(CuTbFeIII)-Tb-II-Fe-III} 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.