Ya-Pan Wu

A novel 1D armed-polyrotaxane chain constructed from a V-shaped tetracarboxylate ligand

A novel armed-polyrotaxane, comprising two interpenetrating chains of rings with arms, is self-assembled from the flexible ligands 3,3′,4,4′-diphenylsulfonetetracarboxylic acid, as an annular linker motif, and 1,2-di(4-pyridyl)ethylene, as linking rods, which further assembles into a 2D ladder network through hydrogen bonding interactions.

Isomeric phenylenediacetates as modular tectons for a series of ZnII/CdII coordination polymers incorporating flexible bis(imidazole) co-ligands

This work presents a systematic investigation of the reactions of phenylenediacetate isomers with ZnII/CdII salts in the presence of different flexible bis(imidazole) co-ligands. Seven new coordination polymers, namely, {Zn(o-pda)(biim-3)}n (1), {[Cd(o-pda) (biim-5)]·H2O}n (2), {[Zn(m-pda) (biim-4)]·3H2O}n (3), {Cd(m-pda)(biim-6)0.5(H2O)}n (4), {[Cd(p-pda) (biim-3)]·H2O}n (5), {Zn(p-pda) (biim-4)}n (6), and {[Cd(p-pda)(biim-6)]·H2O}n (7) [o/m/p-pda = 1,2/1,3/1,4-phenylenediacetate acid, biim-3 = 1,1′-(1,3-propanedidyl)bis-(imidazole), biim-4 = 1,1′-(1,4- butanedidyl)bis-(imidazole), biim-5 = 1,1′-(1,5-pentanedidyl)bis-(imidazole), biim-6 = 1,1′-(1,6- hexanedidyl)bis-(imidazole)], have been synthesized and characterized by elemental analysis, IR, TG, single crystal X-ray structural determination and powder X-ray diffraction. Complex 1 shows an uncommon 1D achiral chain structure, which contains the right-handed and left-handed helical chains decorated with two zigzag arms. Complexes 2, 3, and 5 display the similar 2D undulating sql layer structures. Interestingly, in 3, the 1D water tape T4(2)6(2), which contains the hexameric water cluster (H2O)6 with a chair-like conformation, assembles these 2D layers to form a 3D framework. In 5, the 2D adjacent hetero-helical layers stack in an –ABĀ– pattern to generate a 3D mesomeric framework. Complex 4 manifests a 2D (3,4)-connected V2O5-type network. Differently from 1–5, complex 6 features a 3D 5-fold interpenetrated dia network, and complex 7 exhibits a 3D (3,5)-connected (42·6)(42·65·83)-fsc framework. A structural comparison of these polymers suggests that different dispositions of the carboxyl sites, diversiform configurations and binding fashions of phenylenediacetate isomers play important roles in the construction of resulting architectures for 1–7, which can also be well regulated by different flexible bis-(imidazole) co-ligands. Moreover, solid-state properties such as thermal stabilities and luminescent properties of 1–7 were also investigated.

Hydro(solvo)thermal synthesis, structures, luminescence of 2-D zinc(II) and 1-D copper(II) complexes constructed from pyridine-2,6-dicarboxylic acid N-oxide and decarboxylation of the ligand

Two new coordination polymers [Zn(pydco)(H2O)]n (1) and [Cu(pyco)2]n (2) (pydco = pyridine-2,6-dicarboxylic acid N-oxide, pyco = 2-pyridine carboxylic acid N-oxide) have been synthesized by hydro(solvo)thermal reaction of pydco and two transition metal ions in one pot. Complex 1 is a 2-D network structure containing double helical chains with a strong emission. Complex 2 displays a 1-D infinite ladder-like chain arrangement. Interestingly, pyco came from the in situ decarboxylation of pydco in the hydrothermal reactions. Through a comparison study in a series of hydro(solvo)thermal reaction of pyridine-2,6-dicarboxylic acid N-oxide and transition metal ions, we confirm that the decarboxylations was catalyzed by Mn(II) ions.

4,4′-(1,1,1,3,3,3-Hexafluoro­propane-2,2-diyl)dibenzoic acid

In the title compound, C17H10F6O4, the two benzene rings are twisted with respect to each other, making a dihedral angle of 67.43 (12)°. In the crystal, adjacent molecules are linked by O—H⋯O and C—H⋯F hydrogen bonding, forming a wave-like layered supramolecular structure.

4-(3-Carb­oxy­phen­yl)pyridinium nitrate

In the title salt, C12H10NO2 +·NO3 −, the dihedral angle between the pyridine ring and the benzene ring of the 4-(3-carboxyphenyl)pyridinium cation is 30.14 (2)°. Inversion-related pairs of cations are linked into dimers by pairs of O—H⋯O hydrogen bonds. Pairs of dimers are linked by N—H⋯O and C—H⋯O hydrogen bonds involving nitrate anions as acceptors, generating supramolecular chains along the diagonal of the bc plane.

catena-Poly[zinc(II)-bis-[μ(2)-3-(3-pyrid-yl)-benzoato]-κO:N;κN:O].

In the title compound, [Zn(C12H8NO2)2]n, the Zn2+ cation is coordinated by a pair of carboxylate O atoms as well as two pyridyl N atoms to afford a distorted tetrahedral environment. Adjacent Zn2+ cations, with a separation of 8.807 (2) Å, are linked by two 3-(3-pyridyl)benzoate ligand bridges, generating an infinite ribbon extending parallel to [001].

4-Methyl-sulfanyl-6-(4-pyrid-yl)-1,3,5-triazin-2-amine.

In the title compound, C9H9N5S, the pyridyl and triazine rings make a dihedral angle of 4.8 (2)°. In the crystal, adjacent molecules are bridged by an N—H⋯N hydrogen bond, forming a helical chain running along the b axis.

catena-Poly[[tetra­aqua­(μ-4,4′-bipyridine-κ2N:N′)zinc(II)] fumarate tetra­hydrate]

In the title compound, {[Zn(C10H8N2)(H2O)4](C4H2O4)·4H2O}n, the ZnII atom is coordinated by two N atoms from two μ-4,4′-bipyridine ligands and four water molecules in a distorted octahedral geometry. The coordination unit is extended through the Zn—N bond, leading to a one-dimensional cationic chain. A twofold rotation axis passes through the Zn atom and along the axis of the 4,4′-bipyridine ligand. Each uncoordinated water molecule acts as both hydrogen-bond donor and acceptor. A three-dimensional network is constructed through hydrogen bonds involving water molecules and fumarate dianions.