A novel proton transfer compound (a new molybdate salt) and its X-ray structure

A novel proton transfer compound (OHRNH3)22+(MoO4)2- (R = 2-methyl-1-propyl), derived from 2-amino-2-methyl-1-propanol and MoO2(acac)2, synthesized and characterized by 1H NMR, X-ray diffraction analysis, UV-Vis and FT-IR spectroscopy. The single crystal X-ray diffraction analysis revealed that intra- and intermolecular proton transfer from (MoO4H2) to (OHRNH2) results in the formation of a new molybdate salt that its fragments are connected through H-bonding and ion-pairing as shown in the X-ray crystal structure. This salt crystallizes in the space group P21/n P_1 of the monoclinic system, with four molecules per unit cell. The unit cell parameters are a = 13.6091(11) Å, b = 6.1049(5) Å, c = 17.0840(13) Å and β = 97.745(4)°. KEY WORDS: Proton transfer, Molybdate salt, X-ray structure, MoO2(acac)2, 2-Amino-2-methyl-1-propanol Bull. Chem. Soc. Ethiop. 2013, 27(1), 69-76.DOI: http://dx.doi.org/10.4314/bcse.v27i1.

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%)

Theoretical study on the structural effect of some organic compounds as corrosion Inhibitors on mild steel in acid media

A quantitative structure property relationship (QSPR) analysis of some organic compounds (imines or Schiff bases) is studied. The corrosion inhibition efficiencies of these imines have been studied by using AM1 (Austin model 1) Hamiltonian SCF-MO method and QSPR analysis. One of the most promising semiempirical methods for predicating geometries and electronic properties is AM1. The geometry of all compounds 1-11 was optimized and all data obtained for building the multiple regression model. The proposed equationswere applied to predict the corrosion inhibition efficiency of some related structures to select molecules of possible activity from a presumable library of compounds was obtained from the regression coefficients for themode

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

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

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

(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

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

{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)

[N′-(3-Eth­oxy-2-oxidobenzyl­idene)-4-hy­droxy-3-meth­oxy­benzohydrazidato](methanol)dioxidomolybdenum(VI)

In the title dioxidomolybdenum(VI) complex, [Mo(C17H16N2O5)O2(CH3OH)], the MoVI atom is coordinated by the phenolate O, imine N and enolic O atoms of the tridentate hydrazone ligand, one methanol O atom, and two oxide O atoms, forming a distorted octa­hedral coordination geometry. The oxide O atoms adopt a cis conformation: one is trans to the methanol O atom and the other is trans to the ligand N atom. The dihedral angle between the two benzene rings in the hydrazone ligand is 4.0 (3)°. In the crystal, mol­ecules are linked by O—H⋯N and O—H⋯O hydrogen bonds