A sensitive and simple method for voltammetric analysis of Sudan I as an azo dye in food samples using a Fe3O4-ZIF-67/ionic liquid modified carbon paste electrode

The present studydeveloped a facile and fast electrochemicalapproach to sensitively analyze Sudan I using Fe3O4-ZIF-67 nanocomposite plus ionic liquid (IL). The carbon paste electrode (CPE) modified with Fe3O4-ZIF-67/IL exhibited an excellent electrochemical sensing performance to SudanI. Compared with the unmodified CPE, Fe3O4-ZIF-67/ILCPE could significantly increase the peak current of Sudan I oxidation and decrease the oxidation overpotentials. Under the best experimental conditions, the sensor using differential pulse voltammetry (DPV) technique responded to SudanI linearly (0.5 -560 μM) with a low limit of detection (LOD) of 0.1 μM. Additionally, the applicability and effectiveness of our proposed method in sensing Sudan I present in food samples was confirmed by acceptable recovery rate (96.0-103.6%)

Synthesis, characterization and X-ray structure of an oxazine derivative

The 5,6-dihydro-6-methyl-2,3-diphenyl-2H-1,4-oxazine-2-ol compound (2) was prepared unambiguously by condensation of 1,2-diphenylethanone with 1-amino-2-propanol in the presence of glacial acetic acid. The product was characterized by FT-IR, 1HNMR, UV-Vis spectroscopy and X-ray crystallography. Quantum chemical calculations are used to the proposed mechanism.  KEY WORDS: 1,2-Diphenylethanone, 1-Amino-2-propanol, Oxazine  Bull. Chem. Soc. Ethiop. 2010, 24(2), 283-287

(E)-2-(5,5-Dimethyl­hexa­hydro­pyrimidin-2-yl)-4-(phenyl­diazen­yl)phenol

In the title Schiff base, C18H22N4O, the hexa­hydro­pyrimidinyl ring adopts a chair conformation. The dihedral angle between the aromatic rings of the 4-(2-phenyl­diazen­yl)phenol unit is 15.7 (1)°. There is an intra­molecular O—H⋯N hydrogen bond between the hydroxyl group and an N atom of the hexa­hydro­pyimidinyl unit. Inter­molecular N—H⋯O and N—H⋯N hydrogen bonds give rise to a layer structure

Methanol{2-meth­oxy-6-[(2-oxidoprop­yl)imino­meth­yl]phenolato}dioxidomolyb­denum(VI)

In the structure of the title compound, [Mo(C11H13NO3)O2(CH3OH)], the MoVI ion is octahedrally coordinated by two oxide O atoms, the N atom and two deprotonated OH groups of the tridentate Schiff base ligand 2-meth­oxy-6-[(2-oxidoprop­yl)imino­meth­yl]phenolate and by a methanol O atom. In the crystal structure, two complexes are linked via O—H⋯O hydrogen bonds, yielding a centrosymmetric arrangement involving the methanol hydr­oxy group and one of the ligand O atoms coordinated to the MoVI ion

A new MoVI Schiff base complex: methanol[N′-(3-meth­oxy-2-oxidobenzyl­idene)benzohydrazidato]dioxido­molybdenum(VI)

In the title benzil­idene Schiff base molybdenum(VI) complex, [Mo(C15H12N2O3)O2(CH3OH)], the MoVI ion is coordinated by two oxide O atoms and by two O atoms and one N atom of the tridentate N′-(3-meth­oxy-2-oxidobenzyl­idene)benzo­hydrazidate (L) Schiff base ligand. The methanol O atom completes the distorted octa­hedral configuration of the MoVI atom. Strong O—H⋯N hydrogen bonds form a C(5) chain around a 21 screw axis. Weak C—H—O hydrogen bonds are also present

Methano­ldioxido{1-[(2RS)-(2-oxidoprop­yl)iminometh­yl]-2-naphtholato}molybdenium(VI)

Crystals of the title compound, [Mo(C14H13NO2)O2(CH4O)], were obtained by recrystallization from methanol. The MoVI atom is coordinated by two oxide O atoms and by two O atoms and one N atom of the tridentate 1-[(2-oxidoprop­yl)iminometh­yl]-2-naphtholate Schiff base ligand. The coordination sphere is completed by the O atom of a methanol mol­ecule, yielding a distorted octa­hedron. O—H⋯O hydrogen bonding yields centrosymmetric dimers

{1,1′-[(2,2-Dimethyl­propane-1,3-di­yl)bis­(nitrilo­methyl­idyne)]di-2-naphthol­ato}dioxidomolybdenum(VI) dichloro­methane 1.75-solvate

In the crystal structure of the title compound, [Mo(C27H24N2O2)O2]·1.75CH2Cl2, the MoVI ion is coordinated by two oxide O atoms and by two O and two N atoms of the tetra­dentate 1,1′-[(2,2-dimethyl­propane-1,3-di­yl)bis­(nitrilo­methyl­idyne)]di-2-naphtholate Schiff base ligand in a distorted octa­hedral configuration. The compound crystallizes with 1.75 mol­ecules of dichloro­methane per complex mol­ecule. In the crystal, symmetry-related mol­ecules are linked by a number of C—H⋯O inter­actions involving both the Schiff base ligand and the partly disordered dichloro­methane solvent mol­ecules, leading to the formation of a two-dimensional network extending parallel to (101)

Synthesis of nanopyramidal SnO2 by hydrothermal method on nanostructured silicon substrate with some study

In this study, we grew nanopyramidal SnO2 hydrothermally at low temperature on both bare and nanotextured silicon substrates. Plasma etching of silicon is accomplished for the evolution of nanotextures on silicon substrate which are called silicon nanograsses. Comparing Scanning Electron Microscope (SEM) images of the synthesized SnO2 nanopyramids on two bare and nanotextured silicon substrates, reveals that there are considerable differences between growth on these substrates such as better uniformity. Therefore, application of silicon nanograss substrates in the synthesis of SnO2 nanostructures can improve growth process and this promotes various applications of this material in the different science fields. We also survey the effect of seed layer on growth of SnO2 nanopyramid

Preparation and characterization of U3O8 nanoparticles via solid âstate thermal decomposition of a new dioxidouranium (VI) complex [UO2(L)(DMF)]: L= 2, 2\'-((1E, 1E\')-(1, 2 phenylen bis (azanylylidene)) bis (methanylylidene)) bis (4-bromo phenol)

A new uranyl Schiff base complex, [UO2(L)(DMF)] where L= 2, 2'-((1E, 1E')-(1, 2 phenylen bis (azanylylidene)) bis (methanylylidene)) bis (4-bromo phenol) by reaction between of H2L and (CH3COO)2UO2·2H2O  was successfully synthesized. The complex characterized by FT-IR, 1H NMR as well as electronic and luminescence property measurements. This complex was used as a novel precursor for preparing U3O8 nanopowder at low temperature (400 ËC) by decomposition method. The average crystallite size of the U3O8 nanopowder that has been synthesized is about 22. nm as determined by the Scherrer equation.  According the results, we found that U3O8 could stop biofilm formation in S. aureus PTCC 1112 (0.632 mg/ml), M. luteus PTCC 1110 (0.633 mg/ml) and E. faecalis (0.633 mg/ml). Also, U3O8 repressed biofilm formation in M. luteus PTCC 1110 (0.625 mg/ml), E. faecalis (0.313 mg/ml) and C. albicans PTCC 5027 bacterias (1.27 mg/ml)

Cis-Dioxido-molybdenum(VI) complexes of tridentate ONO hydrazone Schiff base: Synthesis, characterization, X-ray crystal structure, DFT calculation and catalytic activity

Two new cis-MoO₂ [MoO₂(L)(EtOH)] (1), [MoO₂(L) (Py)] (2) [L: (3-methoxy-2oxidobenzylidene)benzohydrazidato], complexes have been synthesized and fully characterized on the basis of elemental analysis, FT-IR, molar conductivity, ¹H NMR, ¹³C NMR and electronic spectra. The structure of complexes has been accomplished by single crystal X-ray diffraction. All experimental results confirmed that both complexes have an octahedral geometry around the Mo(VI) central atom, which is coordinated by the donor atoms of the dianionic hydrazone ligand, two oxido groups and oxygen/nitrogen atoms of solvent molecules. Computational studies were also performed using DFT calculations at B3LYP/DGDZVP level of theory. Furthermore, their catalytic activities were investigated on the electrophilic reaction of indole with aldehydes in molten tetrabutyl ammonium bromide (TBAB) to obtain bis(indolyl)methane derivatives