A multifunctional 3D chiral porous ferroelectric metal-organic framework for sensing small organic molecules and dye uptake.

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.

A super water-stable europium-organic framework: guests inducing low-humidity proton conduction and sensing of metal ions.

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.

Syntheses, structures, tunable emission and white light emitting Eu3+ and Tb3+ doped lanthanide metal-organic framework materials.

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.

catena-Poly[[[aqua-(4,4'-dimethyl-2,2'-bipyridine-κ(2)N,N')zinc]-µ-3-chloro-benzene-1,2-dicaboxylato-κ(2)O(2):O(3)] [[(4,4'-dimethyl-2,2'-bipyridine-κ(2)N,N')zinc]-µ-3-chloro-benzene-1,2-dicaboxylato-κ(2)O(2):O(3)]].

In the title compound, {[Zn(C(8)H(3)ClO(4))(C(12)H(12)N(2))(H(2)O)]·[Zn(C(8)H(3)ClO(4))(C(12)H(12)N(2))]}(n), one Zn(2+) ion is five-coordin-ated by two O atoms from two different 3-chloro-benzene-1,2-dicarboxyl-ate ligands, one O atom from a water mol-ecule and two N atoms from a 4,4'-dimethyl-2,2'-bipyridine ligand, while the second Zn(2+) ion is four-coordinated by two O atoms from two different 3-chloro-benzene-1,2-dicarboxyl-ate ligands, and two N atoms from a 4,4'-bimethyl-2,2'-bipyridine ligand. The crystal structure exhibits a three-dimensional supra-molecular structure composed of alternate Zn(C(8)H(3)O(4)Cl)(C(12)H(12)N(2)) and Zn(C(8)H(3)O(4)Cl)(C(12)H(12)N(2))(H(2)O) chains, which are linked together by face-to-face π-π inter-actions [shortest centroid-centroid distances of 3.661 (4) and 3.6901 (3) Å], O-H⋯O and C-H⋯O hydrogen bonds.