Cui-Wu Lin

Synthesis, crystal structures, and properties of three helical coordination polymers with quinolinecarboxylate ligand

Three mixed-ligand complexes [M(L)(Phen)(H2O)] n  · nH2O [M =  Ni (1), Co (2), Zn (3)], (L = 2-methylquinoline-3,4-dicarboxylate dianion; phen = 1,10-phenanthroline) have been synthesized by the reaction of MCl2 with 2-methylquinoline-3,4-dicarboxylate acid, sodium hydroxide, and 1,10-phenanthroline under hydrothermal conditions and were characterized by single-crystal X-ray diffraction. Complexes 1–3 crystallize isomorphously in the orthorhombic space group Pbca and feature 1-D helical chains. These helical chains are linked to form a 2-D layer through π–π stacking interactions, which are further linked by hydrogen bonds to form a 3-D network. Solid-state properties such as thermal stability and fluorescence emission of the polymeric Zn complex 3 have also been investigated.

(E)-Methyl 3-(3,4-dihy-droxy-phen-yl)acrylate.

The benzene ring in the title compound, C10H10O4, makes an angle of 4.4 (1)° with the C—C—C—O linker. The hydroxy groups are involved in both intra- and intermolecular O—H⋯O hydrogen bonds. The crystal packing is stabilized by O—H⋯O hydrogen-bonding interactions. The molecules of the caffeic acid ester form a dimeric structure in a head-to-head manner along the a axis through O—H⋯O hydrogen bonds. The dimers interact with one another through O—H⋯O hydrogen bonds, forming supermolecular chains. These chains are further extended through C—H⋯O hydrogen bonds as well as van der Waals interactions into the final three-dimensional architecture.

Diaqua-bis(1H-1,2,4-triazole-3-carboxyl-ato)cadmium(II).

In the title complex, [Cd(C3H2N3O2)2(H2O)2], the CdII atom is coordinated by two N and two O atoms from two deprotonated 1H-1,2,4-triazole-3-carboxylic acid ligands (TRIA) and two water molecules. The Cd atom is located on an inversion centre. In the crystal structure, molecules are linked together via O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional network.

3β-Hydroxy­friedelan-17β-carboxylic acid

The title compound, C30H50O3, which was isolated from a marine endophytic fungus, is a new friedelan derivative. The molecule contains five six-membered rings, which exhibit boat (ring A), distorted boat (ring B) and chair (rings C–E) conformations. The crystal structure is stabilized by intermolecular O—H⋯O hydrogen bonds, which link neighbouring molecules into 12-membered rings.

Bis[3-chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinato]nickel(II) tetra-hydrate.

In the title complex, [Ni(C11H9ClN3O2)2]·4H2O, the Ni atom is coordinated by four N atoms and two O atoms derived from two tridentate 3-chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinate ligands. The cis-N4O2 donor set defines a distorted octahedral geometry. In the crystal structure, the complex and water molecules are linked by O—H⋯O hydrogen bonds.

Nitrato(1,10-phenanthroline)(1H-1,2,4-triazole-3-carboxyl­ato)copper(II)

In the title complex, [Cu(C3H2N3O2)(NO3)(C12H8N2)], the CuII ion is coordinated by an N and an O atom from a bidentate 1H-1,2,4-triazole-3-carboxylate (TRIA) ligand, two N atoms from a 1,10-phenanthroline (phen) ligand, and an O atom from a nitrate ligand in a slightly distorted square-pyramidal environment. In the crystal structure, intermolecular N—H⋯O hydrogen bonds link molecules into one-dimensional chains propagating along the b axis direction.

[3-Chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinato](pyridine-2,6-dicarboxyl­ato)nickel(II) dihydrate

In the title compound, [Ni(C11H9ClN3O2)(C7H3NO4)]·2H2O, the NiII atom is coordinated by two N atoms and one O atom of 3-chloro-6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinate and by one N atom and two O atoms of pyridine-2,6-dicarboxylate in a distorted octahedral coordination. In the crystal structure, molecules are linked together by intermolecular O—H⋯O hydrogen bonds. One water molecule is disordered over two positions; the site occupancies are ca 0.53 and 0.47.

Bis[6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinato]manganese(II) trihydrate.

In the title complex, [Mn(C11H10N3O2)2]·3H2O, the MnII atom is coordinated by four N atoms and two O atoms in a distorted octahedral geometry. The molecules are linked together via hydrogen bonds involving the water molecules. One of these is disordered equally over two positions.

4-Hy-droxy-3,5-dimeth-oxy-N-{4-[(5-methyl-1,2-oxazol-3-yl)sulfamo-yl]phen-yl}benzamide methanol monosolvate.

The title compound, C19H19N3O7S·CH3OH, was synthesized from syringic acid and sulfamethoxazole. The benzene rings make a dihedral angle of 41.8 (1)° and the isoxazole ring is twisted by 74.3 (1)° from the central benzene ring. The crystal packing features O—H⋯O and O—H⋯N hydrogen bonds in which the hydroxy groups from the main molecule and methanol solvent molecules serve as donor groups.

catena-Poly[[[diaqua­sodium]-di-μ-aqua] 2-(2-pyrid­yl)quinoline-4-carboxyl­ate]

In the title compound, [Na(H2O)4](C15H9N2O2), the Na+ ion is coordinated by six water molecules in an octahedral geometry. The NaO6 octahedra are connected by sharing edges, forming a cationic chain along the b-axis direction. O—H⋯O and O—H⋯N hydrogen bonds link the chains and the 2-(2-pyridyl)quinoline-4-carboxylate anions into a two-dimensional network parallel to (100).