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A family of heteronuclear metal organic frameworks (MOFs) using lanthanide and transition metal ion based on a rigid ligand of substituted imidazoledicarboxylic acid, namely, Ln2Zn2 (μ3-Hmimda) 2 (μ3-mimda) 2·4H2On·mn H2O, Ln = Nd, m = 2 (1), Ln = Ho, m = 3 (2), Ln = Er, m = 2 (3), Ln = Yb, m = 3 (4), Tb2Co2 (μ3-Hmimda) 2 (μ3-mimda) 2·4H2On·2nH2O} (5) and Dy2Co2 (μ3-Hmimda) 2 (μ3-mimda) 2·4H2On·nH2O} (6), (H3mimda = 1H-2-methyl-4, 5-imidazole-dicarboxylic acid), have been developed and characterized. All the complexes (except for a little disparity for 1) are isostructural, and all crystallize in the monoclinic system. They possess an extended reticular-like porous structure constructed from corrugated 2D layers. Direct current (dc) magnetic susceptibility measurements for 1-5 indicated depopulation of the Stark components at low temperature and/or possible weak anti-ferromagnetic interactions within hetero-nuclear MOFs. Alternating current (ac) susceptibility studies reveal that the Dy (III) -Co (II) complex exhibits both possible ferromagnetic couplings and frequency-dependent out-of-phase signals, behaviour of single-ion magnet nature. Fluorescence properties of series complexes both in near-infrared (NIR) and visible regions have been comparatively studied.
Feng et al. (Mon,) studied this question.