Ling-Yu Zhang

Synthesis, Structures, and Properties of Two Zinc(II) and Cadmium(II) Supramolecular Complexes Based on Diphenic Acid

Two novel binuclear metal-organic coordination complexes [Zn2(dpa)2(phen)2(H2O)2] (1), [Cd2(dpa)2(btz)2(H2O)2] (2) (where H2dpa = diphenic acid, phen = 1,10-phenanthroline, btz = thiabendazole) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, spectral method (IR), elemental analysis, and fluorescent properties. Compound 1 crystallizes in the triclinic P-1 space group while compound 2 in the monoclinic system with space group P2(1)/n. The binuclear cluster are stabilized by O‒HO hydrogen bond and further fitted together into 3-D supramolecular network by π–π stacking interactions and hydrogen bonds. The luminescence measurements reveal that two complexes exhibit strong fluorescent emissions in the solid state at room temperature.

Two Novel Benzenedicarboxylate-Metal Complexes: Synthesis, Crystal Structures, and Properties

Two new metal-organic frameworks, namely [Cd(3-NO2-bdc)(2,2′-bpy)(H2O)•H2O]2 (1) and[Ni(3-NO2-bdc)(4,4′-bpy)H2O]n (2) (where 3-NO2-bdcH2 = 3-nitro-1,2-benzenedicarboxylic acid, 2,2′-bpy = 2,2′-bipyridine, 4,4′-bpy = 4,4′-bipyridine), have been synthesized and structurally characterized. Complex 1 is a 0-dimensional (0D) framework, but face-to-face π-π stacking interactions and O–H···O hydrogen bonds extend these molecules into a 3D supramolecular framework. X-ray structure analysis reveals that complexes 2 exhibit a 2-dimensional (2D) network structure. Also, IR spectra, fluorescence properties, thermal decomposition process, and powder X-ray diffraction of the complexes were investigated.

Self-Assembly of 2D Lanthanide-Metal Coordination Polymers Based on 5-Nitroisophthalic Acid Linker: Synthesis, Structures, and Luminescence

Three 2D novel lanthanide-based metallic coordination frameworks involving the 5-nitroisophthalic acid ligand were characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction, namely, [Er(NIPH)2(H2O)2](H2O)2 (1), [Eu4(NIPH)6(H2O)8](H2O)5 (2), and [Eu4(NIPH)6(H2O)6](H2O)4 (3), synthesized under hydrothermal conditions, self-assemble through Ln2[NIPH]2 building blocks to give a 2D coordination layer structure. The adjacent layers stack to form a 3D supramolecular framework through weak interactions, such as hydrogen bonding, π–π interactions, and lone pair-π interactions. However, in 1 and 2 formed 2D 4-connected (4,4) topological network. In addition, in this work the photoluminescent property of the compound 3 has been studied.

Synthesis, Structures, and Properties of 3D Lanthanide (III) Coordination Polymers Based on 5-Nitroisophthalic Acid

A three lanthanide-based coordination compounds of [Sm4(NIPH)5(ox)(H2O)5](H2O)4 (1), [Eu4(NIPH)5(oba)(H2O)5](H2O) (2) and [Eu2(NIPH)3(H2O)14](H2NIPH)(H2O)6 (3) (H2NIPH = 5-nitroisophthalic acid, ox = oxalic acid, H2oba = 4,4′-oxydibenzoic acid) were synthesized by hydrothermal reaction and characterized by single-crystal X-ray diffraction. These compounds contain an -Ln-O-C-O-Ln- zigzag chain, which connect to each other through the oxygen atoms of the H2NIPH ligands to form a wave-like layer. These layers are bridged by oxalate or H2NIPH ligands to generate three-dimensional coordination framework. Within these compounds, porous structure with one-dimensional channels which were filled with isolated organic ligands or lattice water molecules are also observed. Fascinatingly, these lattice water molecules display unprecedented water morphology and play important roles in the stabilizing the whole network. In addition, these compounds show strong photoluminescence at room temperature, respectively, and may be good candidates for potential luminescence materials.

Two d10 Coordination Complexes Based on the Substitutional Aromatic Multicarboxylate and N-Donor Co-Ligands: Syntheses, Structures, and Properties

Two new coordination complexes, formulated as [Cd2(3-NPA)(phen)4(H2O)2]2 (1) and [Zn(3-NPA)(phen)(H2O)]n (2) (3-NPAH2 = 3-nitrophthalic acid, phen = 1,10-phenanthroline) have been synthesized by hydrothermal reactions of the rigid neutral ligand phen with metal ions in the presence of 3-NPAH. X-ray analysis shows that complex 1 is a 0D dinuclear structure that is arranged to form a 3D supramolecular framework through hydrogen bonds and π–π stacking interactions. In polymer 2, the 3-NPA2− anions coordinate the Cd(II) ions in a tridentate mode to form a 1D infinite chain structure, which is connected by the hydrogen bonds and π–π stacking interactions resulting in a 3D supramolecular architecture. In addition, the two complexes were characterized by infrared spectroscopy, elemental analysis, luminescent properties, thermo gravimetric analysis, and powder X-ray diffraction (PXRD).

Construction of Three Novel Coordination Complexes by 3-Nitrophthalic Acid Plus N-Donor Ligands: Synthesis, Structure, and Properties

In order to explore new coordination frameworks with novel designed 3-nitrophthalic acid and N–donor ancillary ligands, three novel coordination complexes, namely, [Co2(3-NPA)2(2,2′-bipy)2(H2O)2]•2H2O (1), [Mn2(3-NPA)2(4,4′-bipy)3(H2O)6]•(4,4′-bipy) (2), and [Pb2O(3-NPA)]n (3) (where 3-NPAH2 = 3-nitrophthalic acid, 2,2′-bipy = 2,2′-bipyridine, 4,4′-bipy = 4,4′-bipyridine), have been hydrothermally synthesized. X-ray structure analysis reveals that 1 and 2 are dinuclear structures, while 3 is a two-dimensional (2D) network polymer. And the hydrogen bonds and π–π stacking also play important roles in affecting the final structure where complexes 1-2 have 3D and 2D supramolecular architectures, respectively. These complexes have been characterized by powder X-ray diffractions (PXRD) and thermal gravimetric analyses (TGA). In addition, their photochemical properties have also been investigated.