We prepared a new rare-earth compound, Eu9MgS2B20O41 (EMSBO), and characterized its structural and physical properties. EMSBO consists of triple-Kagomé-layer slabs separated by nonmagnetic ions and groups. Within each slab, intervalence charge transfer has been found to occur between the Eu2+ and Eu3+ Kagomé layers, a new channel for quantum fluctuation of magnetic moments. The measured magnetic susceptibilities and the specific heat capacity exhibit very similar features characteristic of quantum spin liquid behaviors observed in other materials.

Six three-dimensional (3D) lanthanide coordination polymers with formula [Ln(TDC)(ox)0.5(H2O)2]·(H2O) (1Ln) (Ln = Pr 1, Nd 2, Sm 3, Gd 4) and [Ln(TDC)(ox)0.5(H2O)2]·(H2O) (2Ln) (Ln = Dy 5, Er 6) have been synthesized by hydrothermal reactions of thiophene-2,5-dicarboxylate (TDC) and oxalate (ox) with corresponding lanthanide nitrate. X-ray crystal structure analyses reveal that 1Ln and 2Ln are isomers that may be produced by lanthanide contraction. Compounds 1–4 are isostructural and possess binodal (4,5)-connected 3D framework of tcj/hc topology with triangular channels along the [101] direction. Isostructural compounds 5 and 6 present trinodal (4,4,6)-connected 3D framework of sqc254 topology with rectangular channels along the b axis. The magnetic properties reveal that compound 2 has antiferromagnetic behavior, while compound 4 has ferromagnetic behavior. The luminescent property shows that compound 5 displays intense yellow luminescence and exhibits the typical Dy3+ ion emission. Furthermore, infrared (IR), thermogravimetric analyses (TGA), elemental analyses (EA), powder X-ray diffraction (PXRD), magnetic and luminescent properties of these compounds are also investigated.

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