Phenyl 2-pyridyl Ketone Oxime Research Articles

Strong antiferromagnetic coupling in doubly N, O oximato-bridged dinuclear copper(II) complexes

The use of di-2-pyridyl ketone oxime, (py)pkoH, and phenyl 2-pyridyl ketone oxime, ppkoH, in copper(II) hexafluoroacetylacetonate chemistry is reported. The reaction of CuCl 2·2H 2O with one and two equivalents of ppkoH and Na(hfac), respectively, in CH 2Cl 2 affords the dinuclear complex [Cu 2(hfac) 2(ppko) 2] ( 1) in excellent yield. The replacement of ppkoH by (py)pkoH gives the isostructural compound [Cu 2(hfac) 2{(py)pko} 2] ( 2) in good yield. The Cu II atoms in both 1 and 2 are doubly bridged by the oximate groups of two η 1:η 1:η 1:μ 2 ppko − and (py)pko − ligands, respectively. The bridging Cu–(R–NO)–Cu′ units are not planar, with the torsion angles being 23.2° ( 1) and 20.3° ( 2). A bidentate chelating hfac − ligand completes five-coordination at each square pyramidal metal ion. The hfac −-free reaction system CuCl 2·2H 2O/(py)pkoH/NEt 3 (1:2:1) gives instead the mononuclear complex [CuCl{(py)pko}{(py)pkoH}] ( 3) in very good yield. The Cu II atom is coordinated by two N, N′-bidentate (py)pko −/(py)pkoH chelates and a monodentate chloride anion resulting in a distorted square pyramidal geometry around the metal center. Variable-temperature, solid-state dc magnetic studies were carried out on the representative dinuclear complex 1 in the 2.0–300 K range. The data indicate a very strong antiferromagnetic exchange interaction and a resulting S = 0 ground state, which is well isolated from the S = 1 excited state. The J value of −720 cm −1 was derived from the fitting of the experimental data using the Hamiltonian H = − J( S 1 · S 2).

Dichloridobis(phenyl 2-pyridyl ketone oxime)nickel(II) acetone solvate

The Ni atom in the title compound, [NiCl2(C12H10N2O)2]·C3H6O, adopts a distorted octa­hedral geometry, being ligated by four N atoms from two different phenyl 2-pyridyl ketone oxime ligands and two Cl atoms. In the crystal structure, inter­molecular O—H⋯Cl hydrogen bonds link the mol­ecules into a chain structure along [010]. There is a π–π contact between the pyridine rings [centroid–centroid distance = 3.824 (5) Å].

A family of mononuclear Co III/2-pyridyloximate complexes and their conversion to trinuclear, mixed-valence linear [formula omitted] clusters

The use of the 2-pyridyl oxime ligands (LH) 2-pyridinealdoxime, methyl 2-pyridyl ketone oxime and phenyl 2-pyridyl ketone oxime in Co chemistry has been investigated and led to two families of compounds. The first family includes the mononuclear octahedral, low-spin complexes [Co III(L) 3], while the second family consists of the trinuclear, mixed-valent linear clusters [ Co III 2 Co II(L) 6]X 2 (X = ClO 4 - , PF 6 - ). The latter are prepared by the reactions of the former with an appropriate Co II source. The structural, physical and spectroscopic properties of the complexes are described.

Potentiometric study of binary complexes of methyl 2-pyridyl ketone oxime, phenyl 2-pyridyl ketone oxime and diacetyl monooxime with some transition and heavy metal ions in aqueous solution

The complexation reaction between some oximes including methyl-2-pyridylketone oxime (MPKO), phenyl-2-pyridylketone oxime (PPKO) and diacetyl monooxime (DMO) with some transition and heavy metal ions Co 2+, Ni 2+, Zn 2+, Pb 2+, Fe 2+, Fe 3+, Cr 3+ and La 3+ has been studied potentiometrically in aqueous solution at 25 ± 0.1 °C and ionic strength ( μ) of 0.1 M supported by KCl. The overall stability constants log β's of respective species were obtained by computer refinement of pH–volume data using BEST program. The best model among the several proposed models was selected according to the lowest σ fit value. The main species in binary systems are ML, ML 2, MLH, MLH 2, ML 2H, ML 2H 2, MOHL, M(OH) 2L, M(OH)L 2 and M(OH) 2L 2 (L = MPKO or PPKO or DMO).

Development of a selective and sensitive flotation method for determination of trace amounts of cobalt, nickel, copper and iron in environmental samples

A simple, selective and rapid flotation method for the separation–preconcentration of trace amounts of cobalt, nickel, iron and copper ions using phenyl 2-pyridyl ketone oxime (PPKO) has been developed prior to their flame atomic absorption spectrometric determinations. The influence of pH, amount of PPKO as collector, type and amount of eluting agent, type and amount of surfactant as floating agent and ionic strength was evaluated on the recoveries of analytes. The influences of the concomitant ions on the recoveries of the analyte ions were also examined. The enrichment factor was 93. The detection limits based on 3 sigma for Cu, Ni, Co and Fe were 0.7, 0.7, 0.8, and 0.7 ng mL −1, respectively. The method has been successfully applied for determination of trace amounts of ions in various real samples.

Di-μ-chloro-bis[chloro(phenyl 2-pyridyl ketone oxime-κ2N,N′)copper(II)

The title complex, [Cu2Cl4(C12H10N2O)2], was synthesized by reacting phenyl 2-pyridyl ketone oxime with CuCl2·2H2O in a basic medium. The organic ligand coordinates to the CuII ions through its N atoms, while the oxime O atom remains uncoordinated. The Cl− ions play two roles: one is a terminal ligand and the other is a bridging ligand, the bridge being formed through a crystallographic inversion centre.

A rare mixed-valence state manganese(II/IV) tetranuclear cage formed using phenyl 2-pyridyl ketone oxime and azide as ligands

The reaction of Mn(O 2CPh) 2 · 2H 2O with the sodium salt of phenyl 2-pyridyl ketone oxime and sodium azide in MeOH gives a tetranuclear cage with a [ Mn 3 II Mn IV ( μ 4 - O ) ( η 1 , μ 2 - N 3 ) ] 7 + core. Magnetic and EPR studies show the cage has an S = 6 ground state.

Silver selective electrodes based on methyl-2-pyridyl ketone oxime, phenyl-2-pyridyl ketone oxime and bis[2-(o-carboxythiophenoxy)methyl]-4-bromo-1-methoxybenzene carriers

Silver ion-selective electrodes based on methyl-2-pyridyl ketone oxime (MPKO), phenyl-2-pyridyl ketone oxime (PPKO) and bis[2-(o-carboxythiophenoxy)methyl]-4-bromo-1-methoxybenzene (CMBMB) carriers have been developed. The membrane solutions containing PVC, plasticizer, lipophilic ionic additive, and MPKO, PPKO or CMBMB were directly coated on the surface of graphite electrodes. The electrodes exhibited linear responses with Nernstian slopes of 59.8–60.5mV per decade within the range of 1×10−6M to 1×10−1M silver ion. The response times of the electrodes were <10s over the concentration range of 1×10−2M to 1×10−4M and they did not show a considerable divergence in their potential response over a period of 3 months. The electrodes exhibited good selectivities toward silver ion with respect to alkali, alkaline earth and several transition and heavy metal ions. The electrodes based on MPKO generally showed better selectivity for silver ion compared to the other two carriers. The electrodes based on MPKO and PPKO carriers can be used in a wide pH range of 2.5–8.5 and the one based on CMBMB is suitable in the pH range of 3.0–6.5. Application of the electrodes for potentiometric titrations and determination of Ag+ concentration in waste photographic solutions are reported.

Structure of (E)-phenyl 2-pyridyl ketone oxime

C 12 H 10 N 2 O cristallise dans C2/c dans a=16,246, b=8,423, c=17,383 A, β=122,34 o , Z=8; affinement jusqu'a R=0,045. Les molecules forment un dimere centrosymetrique unique, dans lequel le groupement OH forme une liaison hydrogene qui se dedouble vers l'atome N de la pyridine et l'atome N de l'oxime. Les 2 atomes N de l'oxime ont un contact non liant court de 2,837 A

Crystal and molecular structures of three ketoximes: (E)-O-hexanoyl phenyl 2-pyridyl ketone oxime (C18H20N2O2), (E)-O-octanoyl phenyl 2-pyridyl ketone oxime (C20H24N2O2), (E)-O-myristoyl phenyl 2-pyridyl ketone oxime (C26H38N2O2)

The crystal structures of the three title compounds have been determined by the X-ray structure analysis. The molecule of (E)-O-hexanoyl phenyl 2-pyridyl ketone oxime1 has an anti form at the N-O-C-C ester linkage, while the molecules of (E)-O-octanoyl phenyl 2-pyridyl ketone oxime2 and (E)-O-myristoyl phenyl 2-pyridyl ketone oxime 3 each have a syn form. Compounds2 and3 are crystallized in isomorphic bilayer structures, in which alkyl chains are packed in an antiparallel arrangement.

Structures of O-palmitoyl benzophenone oxime (I) and (E)-O-palmitoyl phenyl 2-pyridyl ketone oxime (II)

Structures of O-palmitoyl benzophenone oxime (I) and (E)-O-palmitoyl phenyl 2-pyridyl ketone oxime (II)