A series of novel lanthanide metal-organic frameworks, namely, {[Ln2(L)2]·(H2O)3·(Me2NH2)2}n (Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Eu (6), Gd (7), Tb (8), Ho (9), Er (10)), have been synthesized with hydro(solvo)thermal conditions based on a flexible multicarboxylic acid (H4L = 5-(3,5-dicarboxybenzyloxy)isophthalic acid). Single crystal X-ray diffraction reveals that all of them are isomorphous and possess a (6,6) topological net with a Schläfli symbol of {4(8)·6(7)}. Considering the blue-emission of compound 1 and the intense emission of the Eu and Tb compounds, we successfully construct isostructural Eu(3+) doped Tb compounds whose color can be tuned easily by adjusting the different concentration of the doped ions, and we also obtained white light emitting materials through the doping of Eu and Tb ions in the La compounds.

The ordered dimethylammonium cations [H2N(CH3)2](+) and helical water spirals as guest species make a super water stable europium-organic framework possess a proton conductivity of over 10(-3) S cm(-1) at 68% relative humidity. A fluorescent probe for Fe(3+) and Cu(2+) ions via a different mechanism has also been realized.

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A series of five coordination polymers, namely, [ 4), [Cd(L)(NDC) 0.5 ] (5) (HL = 3,5-bis(imidazol-1-ylmethyl)benzoic acid hydrochloride, H 2 NDC = naphthalene-1,4-dicarboxylic acid), have been hydrothermally synthesized through the reaction of HL with divalent zinc and cadmium salts, and their structures have been characterized. Due to various coordination modes and conformations of the versatile 3,5bis(imidazol-1-ylmethyl)benzoic acid ligand, these complexes exhibit structural and dimensional diversity. Complexes 1 and 2 are isostructural and exhibit a meso-helical chain structure, and the chains are further connected through the hydrogen bonds to generate a 3D supramolecular network. Complex 3 features a 2D network structure with (6,3) topology. Complex 4 displays a 2-fold interpenetrating ant topological net with the point (Schla ¨fli) symbol of {4 2 .6} 2 {4 4 .6 2 .8 8 .10}. Complex 5 shows a (3,8)-connected tfz-d framework (4 3 ) 2 (4 6 ?6 18 ?8 4 ) topology. The thermal stability, luminescent properties and powder X-ray diffraction (PXRD) were investigated.

A flexible aromatic multicarboxylate ligand and Cd(II) ions assemble into a chiral multihelical porous metal-organic framework with second-order nonlinear optical and ferroelectric properties. The obtained guest-free form highly selectively senses small organic molecules and adsorbs large dye molecules.