Quinoxalin-2-yl o-tolyl ether

The dihedral angle between the two aromatic ring systems in the title compound, C15H12N2O, is 85.9 (1)°; The angle at the O atom is widened to 118.2 (2)°. The quinoxalin­yloxy part of the mol­ecule lies on a mirror plane and the tolyl group is disordered over two positions about the mirror plane

2-Naphthyl quinoxalin-2-yl ether

In the crystal structure of the title compound, C18H12N2O, the two fused rings are aligned at 64.2 (1)°; the C—O—C angle is 118.73 (12)°

1-Naphthyl quinoxalin-2-yl ether

In the crystal structure of the title compound, C18H12N2O, the dihedral angle between the two fused-ring systems is 84.3 (1) °; the C—O—C angle at the ether O atom is 117.31 (18)°

Impact of TiO2 nanotubes’ morphology on the photocatalytic degradation of simazine pollutant

There are various approaches to enhancing the catalytic properties of TiO2, including modifying its morphology by altering the surface reactivity and surface area of the catalyst. In this study, the primary aim is to enhance the photocatalytic activity by changing the TiO2 nanotubes’ architecture. The highly ordered infrastructure is favorable for a better charge carrier transfer. It is well known that anodization affects TiO2 nanotubes’ structure by increasing the anodization duration which in turn influence the photocatalytic activity. The characterizations were conducted by FE-SEM (fiend emission scanning electron microscopy), XRD (X-ray diffraction), RAMAN (Raman spectroscopy), EDX (Energy dispersive X-ray spectroscopy), UV-Vis (Ultraviolet visible spectroscopy) and LCMS/MS/MS (liquid chromatography mass spectroscopy). We found that the morphological structure is affected by the anodization duration according to FE-SEM. The photocatalytic degradation shows a photodegradation rate of k = 0.0104 mi

2-(3-Nitro­phen­oxy)quinoxaline

In the title mol­ecule, C14H9N3O3, the dihedral angle between the quinoxaline and benzene rings is 77.13 (9)°. The mol­ecule is twisted about the ether–benzene O—C bond, with a C—O—C—C torsion angle of −102.8 (2)°. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds, forming layers in the ab plane, with one nitro O atom accepting two such inter­actions. The layers stack along the c-axis direction via weak C—H⋯π inter­actions

1H-Benzimidazol-2-ylmethyl phenyl ether

There are two mol­ecules in the asymmetric unit of the title compound, C14H10N2O: the dihedral angles between their aromatic ring planes are 47.4 (4) and 46.8 (3)°. In the crystal structure, mol­ecules are linked by N—H⋯N hydrogen bonds from the secondary nitro­gen N—H donor to the tertiary N-atom acceptor of a symmetry-related neighbour, resulting in hydrogen-bonded chains. The two independent chains both propagate in [100]

N-(4-Chloro­phen­yl)quinolin-2-amine

There is a twist in the title mol­ecule, C15H11ClN2, as seen in the dihedral angle of 18.85 (9)° between the quinoline and benzene rings. A short C—H⋯N contact arises from this conformation and the amine H and quinoline N atoms are directed towards opposite sides of the mol­ecule. In the crystal, supra­molecular layers in the ab plane are mediated by C—H⋯π inter­actions

2,2′-[Nonane-1,9-diylbis(nitrilo­methyl­idyne)]diphenol

In the title Schiff base compound, C23H30N2O2, the complete mol­ecule is generated by crystallographic twofold symmetry, with one C atom lying on the rotation axis. The nonane chain adopts a linear conformation and the hydr­oxy group forms an intra­molecular O—H⋯N hydrogen bond to the imine group

Isolation and photophysical properties of Di- and Tri-substituted natural anthraquinones from Malaysian Morinda citrifolia

Five di- and tri-substituted natural anthraquinones, i.e. nordamnacanthal (1), damnacanthal (2), rubiadin (3), 1-methoxy-2-methyl-3-hydroxyanthraquinone (4) and 1-hydroxy-3-methoxyanthraquinone (5) were subjected to photophysical studies. The results indicated that steric hindrance and intramolecular hydrogen bonding are important factors that affect absorption and emission spectral of these natural anthraquinones. Besides that, emission properties were significantly enhanced with formation of intramolecular hydrogen bonding in 1,3-dihydroxy-2-aldehyde tri-substituted anthraquinone 1. This gave rise to formation of two additional quasi aromatic rings extending the π-conjugation system in the anthraquinone structure

4-(4-Hy­droxy­methyl-1H-1,2,3-triazol-1-yl)benzoic acid

In the title compound, C10H9N3O3, there is a small twist between the benzene and triazole rings [dihedral angle = 6.32 (7)°]; the carb­oxy­lic acid residue is almost coplanar with the benzene ring to which it is attached [O—C—C—C torsion angle = 1.49 (19)°]. The main deviation from coplanarity of the non-H atoms is found for the hy­droxy group which is almost perpendicular to the remaining atoms [N—C—C—O torsion angle = −75.46 (16)°]. In the crystal, the presence of O—H⋯O (between carboxyl groups) and O—H⋯N (between the hy­droxy group and the triazole ring) hydrogen bonds leads to supra­molecular chains along [03]. The chains are connected into sheets via C—H⋯O(hy­droxy) inter­actions