Tanwawan Duangthongyou

catena-Poly[[diaqua­dipyridine­zinc(II)]-μ-succinato]

In the title compound, [Zn(C4H4O4)(C5H5N)2(H2O)2]n, the ZnII ion (site symmetry ) is coordinated in an octahedral geometry by two pyridine molecules, two water molecules and two bridging centrosymmetric O-monodentate succinate dianions to create one-dimensional polymeric chains. The chains are cross-linked by O—H⋯O hydrogen bonds, forming sheets.

2-Meth­oxy-1-(2-meth­oxy-4-nitro­naphthalen-1-yl)-6-nitro­naphthalene

In the title compound, C22H16N2O6, the naphthalene ring systems form a dihedral angle of 65.2 (1)°. Two O atoms of one of the nitro groups are disordered over two sets of sites with occupancy factors of 0.586 (15) and 0.414 (15). Weak C—H⋯O intermolecular interactions are present, forming a ladder like structure along the a axis.

2,2′-({4-[(4-Nitro­phen­yl)diazen­yl]phen­yl}imino)­diethanol

In the title compound, C16H18N4O4, the molecule assumes an E conformation with respect to the N=N double bond. The aromatic rings are not coplanar, with a dihedral angle of 7.51 (8)°. The nitro group is tilted by 4.71 (11)° relative to the attached benzene ring. In the crystal, molecules are connected through O—H⋯O hydrogen bonds forming a double-stranded chain parallel to the b axis.

4,4'-Dimeth-oxy-2,2'-[methyl-aza-ne-diyl-bis(methyl-ene)]diphenol.

The title compound, C17H21NO4, shows an intramolecular hydrogen bond between a phenol OH group and the N atom. In the crystal, molecules are connected by pairs of O—H⋯O hydrogen bonds into inversion dimers.

3-Amino-benzoic acid-4,4'-bipyridine (2/3).

The asymmetric unit of the title compound, 3C10H8N2·2C7H7NO2, consists of three molecules of 4,4′-bipyridine (bpy) and two molecules of 3-aminobenzoic acid (bza). Two molecules of bza and two molecules of bpy are connected via O—H⋯N, N—H⋯N and N—H⋯O hydrogen bonds, forming forming infinite double-stranded zigzag chains along the c axis. The third molecule of bpy is linked to the chain by weak C—H⋯O interactions. Adjacent chains are linked via π–π interactions [centroid–centroid distances = 3.759 (3)–3.928 (3) Å] involving the pyridine rings of bpy molecules, resulting in a sheet-like structure parallel to (100). These sheets are stacked via C—H⋯π interactions, resulting finally in the formation of a three-dimensional supramolecular structure.

2-{[(2-Hy­droxy-3,5-dimethyl­benz­yl)(meth­yl)amino]­meth­yl}-4,6-dimethyl­phenol

In the title compound, C19H25NO2, the dihedral angle between the benzene rings is 53.15 (8)°. One of the –OH groups forms an intramolecular O—H⋯N link, generating an S(6) ring. The other –OH group forms an intermolecular O—H⋯N hydrogen bond in the crystal, generating centrosymmetric R 2 2(20) loops.

Base-Mediated Cascade Cyclization: Stereoselective Synthesis of Benzooxazocinone

A new strategy for the synthesis of the oxa-azabicyclo[3.3.1]nonane subunit, a component of the naucleamide E core structure, has been developed. This annulation reaction between 1-substituted 3,4-dihydroisoquinolines and coumarin derivatives conveniently affords the oxa-azabicyclo[3.3.1]nonane framework via a base-mediated cascade cyclization under aqueous conditions. The value of this work lies in the efficient formation of the oxa-azabicyclo[3.3.1]nonane skeleton via a process whereby all the C-C, C-O, and C-N bond formations occur in a single chemical operation. In addition, the subsequent ring opening of these compounds furnished pyridoisoquinoline derivatives.

Synthesis of Encapsulated Zn(8-hydroxyquinoline)2(H2O)2 in the Pore of BioMOF1 for Sensing Dissolved Oxygen in Water

The Zn(8-hydroxyquinoline)2(H2O)2, ZnQ2·2H2O, encapsulated in the porous BioMOF1 (ZnQ2@BioMOF1) host was synthesized by solid-solid and solid-solution reaction between Zn2+@BioMOF1 and 8-hydroxyquinoline. To prepare Zn2+@BioMOF1, dimethylammonium (DMA+), guests in the pores of BioMOF1 were replaced by Zn2+ ions via ion exchange process. The synthesized compound was characterized by XRD and TGA to confirm stability of BioMOF1 host. The ZnQ2·2H2O forming by metal-cation-directed de novo coassembly approach was confirmed by UV, IR, Fluorescence, BET, and confocal microscopy. Scanning electron microscopy images show slight change in morphology of BioMOF1 after introducing ZnQ2·2H2O by solid-solution reaction into its pores. Thin films of the produced materials were used to sense dissolved oxygen in water by using fluorescence technique.

The crystal structure of 2-[5-(di­methyl­amino)­naphthalene-1-sulfonamido]­phenyl 5-(di­methyl­amino)­naphthalene-1-sulfonate

The complete molecule of the title compound, C30H29N3O5S2, is generated by a crystallographic twofold axis: the O atom and NH group attached to the central benzene ring are statistically disordered. The dihedral angle between the naphthalene ring system and the central benzene ring is 52.99 (6)°, while the pendant naphthalene ring systems subtend a dihedral angle of 68.17 (4)°. An intramolecular C—H⋯O hydrogen bond closes an S(6) ring. In the crystal, the molecules are linked by weak C—H⋯O hydrogen bonds.