Can Ji

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.

Anionic porous metal–organic framework with novel 5-connected vbk topology for rapid adsorption of dyes and tunable white light emission

A novel porous metal–organic framework, {[Zn2(L)·H2O]·3H2O·3DMAc·NH2(CH3)2}n (Zn(II)–MOF), was synthesized under solvothermal conditions using a flexible multicarboxylic acid (H5L = 3,5-bis(1-methoxy-3,5-benzene dicarboxylic acid)benzoic acid). Zn(II)–MOF contains 1D nanotubular channels of 13.8 A × 16.4 A and exhibits a rare 5-connected vbk net with a Schlafli symbol of {45.65} topology. Notably, Zn(II)–MOF can adsorb toluidine blue fast and effectively, and trap lanthanide ions such as Eu3+ and Tb3+ to sensitize their emissions in the solid state through a Ln3+-exchanged approach. Furthermore, we successfully obtained white light emitting materials.

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.

Benzenepolycarboxylate-templated assembly of silver coordination polymers exhibiting argentophilic honeycomb layer and tubular motifs

Organic anion template-controlled reactions of benzenepolycarboxylic acids with silver(I) salts resulted in two coordination polymers with distinct structural features based on the argentophilic interaction, one exhibiting a honeycomb layer formed by the fusion of macrocyclic Ag(16) rings and the other furnishing the first example of a Ag(∞) tubular motif.

A series of five divalent zinc and cadmium coordination polymers based on a new bifunctional ligand: syntheses, crystal structures, and properties

A series of five coordination polymers, namely, [Zn(L)2(H2O)2]·3H2O (1), [Cd(L)2(H2O)2]·3H2O (2), [Zn(L)Cl]·2H2O (3), [Cd(L)Cl] (4), [Cd(L)(NDC)0.5] (5) (HL = 3,5-bis(imidazol-1-ylmethyl)benzoic acid hydrochloride, H2NDC = 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 3,5-bis(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 (Schlafli) symbol of {42.6}2{44.62.88.10}. Complex 5 shows a (3,8)-connected tfz-d framework (43)2(46·618·84) topology. The thermal stability, luminescent properties and powder X-ray diffraction (PXRD) were investigated.

Assembly of 1,2,3,4-Benzenetetracarboxylic Acid and Zinc(II) Metal Centers to a Chiral 3D Metal-organic Framework: Syntheses, Structure and Properties

A new three-dimensional metal-organic framework {[Zn(mpda)0.5(bix)]·(H2O)1.5}n (1) (H4mpda = 1,2,3,4-benzenetetracarboxylic acid, m-bix = 1,3-bis(imidazol-1-ylmethyl)-benzene) has been synthesized and characterized by single-crystal X-ray diffraction and IR spectra. In 1, homochiral helical chains are formed in the Zn-mpda layer through spontaneous resolution by mpda4−. Such layers are further connected through the second m-bix ligand to form a 3D chiral metal-organic framework. The individual (4,4)-connected net in 1 can be specified by the Schläfli symbol (66)2(64.82). Bulk material of 1 has good second-harmonic generation (SHG) activity, approximately 0.4 times that of urea. In addition, a thermogravimetric analysis was carried out, and the photoluminescent behavior of the complex was also investigated Graphical Abstract Assembly of 1,2,3,4-Benzenetetracarboxylic Acid and Zinc(II) Metal Centers to a Chiral 3D Metal-organic Framework: Syntheses, Structure and Properties