Polyoxometalate-Based Metal-Organic Frameworks with Unique High-Nuclearity Water Clusters.

The maximum exposure of polyoxometalates (POMs) is of great significance to enhance the catalytic performance of HKUST-1 with incorporated Keggin-type POMs. Herein, two phosphovanadomolybdates were encapsulated into the HKUST-1 via a hydrothermal method to obtain two polyoxometalate-based metal-organic frameworks, formulated as [Cu(BTC)(HO)][HPMoVO]@(HO) () and [Cu(BTC)(HO)][HPMoVO]@(HO) (). Single-crystal X-ray diffraction analysis indicates that two compounds contain unique high-nuclearity water clusters without organic counter cations.

Synthesis, crystal structures and magnetic properties of two heterometallic {LnCr} (Ln = Gd and Tb) complexes with one-dimensional wave chain structure.

Two isomorphic heterometallic 3d-4f cluster-based materials, formulated [GdCr(IN)(μ-O)(μ-OH)(μ-O)(HO)]·13HO (1) and [TbCr(IN)(μ-O)(μ-OH)(μ-O)(HO)]·13HO (2) (abbreviation: {LnCr}: Ln = Gd (1); Tb (2); HIN = isonicotinic acid), were achieved by hydro-/solvothermal method through using the ligand HIN. X-ray diffraction analysis illustrates eight lanthanide ions (Ln = Gd, Tb) and four transition-metal ions (Cr) of {LnCr} were constructed from two classical "drum-like" {LnCr} structures associated by organic ligands HIN, displaying a one-dimensional wave chain structure, which is rare. The magnetic properties of {GdCr} were inspected and showed the existence of antiferromagnetic coupling interactions between contiguous metal ions.