Bis{2-[(2,4-dimethyl­phen­yl)imino­meth­yl]pyridine-κ2 N,N′}bis­(thio­cyanato-κN)cadmium

The title compound, [Cd(NCS)2(C14H14N2)2], features crystallographic inversion symmetry with the CdII ion located on a centre of inversion. The CdII ion is six-coordinated in a slightly distorted octa­hedral geometry with the thiocyanate anions in axial positions. The angle between the benzene and pyridine rings is 69.64 (9)°. An inter­molecular C—H⋯S hydrogen bond stabilizes the crystal structure

Dichlorido[2,4-dimethyl-N-(pyridin-2-yl­methyl­idene)aniline-κ2 N,N′]dimethyl­tin(IV)

The asymmetric unit of the title compound, [Sn(CH3)2Cl2(C14H14N2)], contains two crystallographically independent mol­ecules. In each mol­ecule, the SnIV atom is six-coordinated in a distorted octa­hedral geometry by one bidentate 2,4-di­methyl-N-(pyridin-2-yl­methyl­idene)aniline ligand, two methyl groups and two Cl atoms. In the crystal, inter­molecular C—H⋯Cl hydrogen bonds link the mol­ecules. There are π–π contacts between the pyridine rings of the ligands [centroid–centroid distance = 3.761 (4) Å]

A second monoclinic polymorph of 2,4-dimethyl­anilinium chloride

A second monoclinic polymorph of 2,4-dimethyl­anilinium chloride, C8H12N+·Cl−, (I), is reported. The unit-cell dimensions differ from those of the first reported monoclinic form, (II) [Yao (2010 ▶). Acta Cryst. E66, o1563]. Nevertheless, both compounds crystallize in the monoclinic space group P21/n. As in (II), the protonated amine group in (I) acts as a hydrogen-bond donor to the chloride ion, forming three N—H⋯Cl hydrogen bonds. The result is a two-dimensional network in the ac plane. The difference in the hydrogen-bond pattern is that in (I) only 12-membered rings are formed whereas in (II), eight-membered and 16-membered rings are formed

2,3-Dimethyl­anilinium chloride monohydrate

The crystal structure of the title salt, C8H12N+·Cl−·H2O, consists of discrete organic cations, chloride anions and water mol­ecules which are connected by N—H⋯Cl, N—H⋯O and O—H⋯Cl hydrogen bonds. These inter­actions lead to the formation of layers lying parallel to the ab plane

Di-μ-chlorido-bis{chlorido[2,3-dimethyl-N-(pyridin-2-ylmethylidene)aniline-κ2N,N′]mercury(II)}

In the centrosymmetric binuclear molecule of the title complex, [Hg2Cl4(C14H14N2)2], the five-coordinated HgII ions have a distorted square-pyramidal geometry defined by two N atoms belonging to the chelating iminopyridine ligand and three Cl atoms. The benzene and pyridine rings are oriented at a dihedral angle of 56.7 (6)°. The crystal packing is stabilized by C—H...Cl hydrogen bonds and π–π interactions between the pyridine rings [centroid–centroid distance = 3.796 (6) Å]

{2-[(2,5-Dimethylphenyl)iminomethyl]pyridine-κ2N,N′}diiodidozinc(II)

In the molecule of the title compound, [ZnI2(C14H14N2)], the Zn atom is four-coordinated in a distorted tetrahedral geometry by two N atoms of the Schiff base ligand and by two I atoms. The benzene and pyridine rings are oriented at a dihedral angle of 70.75 (3)°. The five-membered ring has an envelope conformation. There is a weak π–π interaction between benzene rings, with a centroid-to-centroid distance of 3.975 (4) Å

Removal of congo red azo dye from aqueous solution by ZnO nanoparticles loaded on multiwall carbon nanotubes

The present work investigates the performance of ZnO nanoparticles loaded on multiwall carbon nanotubes for removing of congo red dye from aqueous solutions. The prepared nanocomposites are characterized by XRD, TEM, FTIR, FESEM and EDX. The effect of various parameters such as contact time, temperature and adsorbent dosage are investigated and discussed. The obtained results show that the optimum adsorption conditions are contact time of 50 min., 55 °C and dosage of 9 mg. These optimum parameters give a high removal ratio of 99.8%.The adsorption data were well fitted by pseudo-second-order model. The obtained results reveal that ZnO/MWCNTs is a promising, environmentally friendly and efficient adsorbent for some wastewater treatment

Gas-Screen Slotted Quartz Tube Atomic Absorption Spectrometry: A Remedy for Reducing Interference Effects of Calcium and Chromium

A simple device for the reduction of nonspectral interferences in flame atomic absorption spectrometry is proposed. It has been reported that the use of a gas screen (GS) system together with a slotted quartz tube (SQT) enhances the residence time of analyte atoms in measurement zone even more than the SQT alone. This combination causes enhancement of sensitivity and improves the reproducibility of absorbance measurements. In addition, it protects the optical windows of the atomic absorption spectrometer. The operational mechanism of gas screen is simply applying two argon gas walls at both ends of SQT to provide an environment that is partly protected from air. This action enhances the sensitivity of measurement. In this study, interference effects of excess amounts of calcium and chromium on the measurements of Cd, Co, Cu, Pb, Mn, Ni, Se, and Zn were studied using flame AAS. The presence of both Ca and Cr cause higher absorbance values; it is suggested that this is due to formation of oxide species of Ca and Cr and as a result analyte oxide production is suppressed. Therefore, analyte free atom population and sensitivity are enhanced. This enhancement results in a positive error in measurements. For instance, presence of solely 8.0mgL1 of Cr or Ca for Pb as the analyte enhances the signals by 75% and 56%, respectively. When SQT or GS-SQT is used, this effect is significantly reduced