The current manuscript summarizes the insect toxicology and entomological efficacy of some newly synthesized mixed ligand complexes of Zinc against Spodoptera litura and Tetranychus sp. The results clearly indicate them as potential insecticidal agents

The present manuscript deals with the insecticidal and toxicological activities of some mixed ligand complexes of Zinc which are recently been reported. The newly synthesized complexes were also tested for their contact, stomach, antifeedant, and acaricidal activities against insects, pests, and mites. The outcome of screening clearly indicates them as potent insecticidal agents.

Mixed ligand nickel (II), complexes of 2, 2 bipridyle and thioamides of 2-aminopyridine, 2-aminoadinine, 2-aminoguanine and 2-aminocytocine were prepared. The success of synthesis was confirmed through physical and spectral characterization on the basis of IR and NMR spectroscopy, antimicrobial and antitumour studies. The synthesized compounds were found to be active against the tested three bacterial strains (Pseudomanas auruginosa, Klebseila pneumonia and Staphylococcus aureus), two fungal strains (Aspergillus flavus and Aspergillus nigar) and antitumour activity against MCF-7 (Human breast adenocarcinoma) cell line.

Six heterobimetallic alkali metal dioxidovanadium(V) coordination polymer complexes {[M-6{VO(mu-O)}(2)(mu-OH)(4)(mu(4)-slox/nph)].n DMF}(infinity) where M = Na, K, and Cs; n = 1 for (1), 0 for (2)-(6) of two dihydrazone ligands, disalicylaldehydeoxaloyldihydrazone (H4slox) and bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone (H4nph) are reported. All the complexes have been characterized by various physicochemical techniques such as elemental analyses, molar conductance, IR, NMR, UV-vis, and cyclic voltammetry. The IR, (HNMR)-H-1, and (CNMR)-C-13 spectral data suggest that the dihydrazones are coordinated through phenolate/naphtholate oxygen, enolate oxygen, and azine nitrogen atoms to the metal centres. The structure of complex {[Na-6{VO(mu-O)}(2)(mu-OH)(4)(mu(4)-slox)].DMF}(infinity) (1) is also determined by single crystal X-ray data, which revealed that the H(4)slox coordinated via all possible dative sites to metal centres as tetrabasic octadentate ligand. The vanadium metal centres adopted distorted square-pyramidal coordination geometries, and the sodium atoms are also in five coordination atmospheres. The electronic spectra of the complexes showed LMCT bands in addition to intra-ligand pi -> pi* and n -> pi* transitions. As evident from the cyclic voltammetry, the complexes showed two metal centred electron transfer reactions {[((VVV)-V-V(slox)(2-)/(VVIV)-V-V(slox)(3-)] and [((VVIV)-V-V(slox)(3-)/(VVIV)-V-V(slox)(4-)]}, in addition to the ligand centred electron transfer reactions. Further, bovine serum albumin (BSA interaction studies of the complexes {[Na (6){VO(mu-O)} (2)(mu-OH) (4)(mu(4)-slox)].DMF} (infinity) (1) and [Na-6{VO(mu-O)}(2)(mu-OH)(4)(mu(4)nph)](infinity) (4) revealed strong binding affinity. Moreover, the catalytic studies of the complexes (1) and (4) were found to be effective for the oxidation of alcohols into their corresponding aldehydes and ketones and bromination of some organic substrates in the presence of H2O2 as an oxidizing agent.

We report herein a ligand and additive- free [CuNi(bz)3(bpy)2]ClO4 catalyst system that efficiently and selectively catalyses the oxidation of a range of primary and secondary benzylic alcohols, 1 – heteroaryl alcohols, cinnamyl alcohol, and aliphatic alcohols mediated by hydrogen peroxide to the corresponding aldehydes and ketones, respectively.

Manganese(II) complex [Mn(phen)(H2O)(4)]center dot SO4 center dot 2H(2)O has been synthesized in aqueous methanol medium. The complex crystal was directly obtained from reaction of MnSO4 center dot H2O in water with a mixture of methanol solution of disalicyaldehyde oxaloyldihydrazone and 1,10-phenanthroline. Its structure has been established by X-ray crystallography. It has also been characterized by thermogravimetry, TEM, magnetic moment, UV-visible, EPR and IR spectra. The complex is normal paramagnetic and shows a weak d-d band at 420 nm due to (6)A(1g) (F) -> T-4(2g )(G) transition and strong charge transfer bands. The EPR spectrum of the complex is indicative of decrease of metal-metal interaction with decrease in temperature. IR spectra of the complex is consistent with the coordination of 1,10-phenanthroline to the manganese(II) centre. (C) 2018 Elsevier B.V. All rights reserved.

Low-spin manganese (II) complexes [MnII(H2slox) (bipy)] (1), [MnII(H2slox) (phen)] (2), [MnII(H2slox) (phen)].1.5.H2O (2a), [MnII(H2nph) (bipy)].H2O (3) and [MnII(H2nph) (phen)].H2O (4) were synthesized from oxaloyldihydrazones in methanolic-water medium. The stoichiometry of the complexes was established by analytical, molecular weight and thermoanalytical data. Based on the data obtained from molar conductance, UV–visible, Infrared spectral, magnetic moment and electron paramagnetic resonance spectroscopic studies, the structures of the complexes have been established. From molar conductance it is suggested that all the complexes are non-electrolyte in DMF medium. The complex (2a) is monomeric in nature whereas the complexes (1) to (4) are dimeric based on the molecular weight data. The effective magnetic moment of complexes (1) to (4) show metal-metal interaction while complex (2a) has no metal-metal interaction. The complexes (1)–(4) show two quasi-reversible metal centred electron transfer reaction involving MnII/MnI/Mn0 redox reactions in DMF medium.

Three new homobimetallic vanadium(V) complexes were synthesized and structurally characterized. The structures of the complexes were established using single X-ray crystallography and DFT method. All the complexes were successfully employed as a functional catechol-oxidase mimic for oxidation of 3,5-di-tert-butylcatechol to 3,5-di-tert-butyl-o-benzoquinone under atmospheric oxygen. The system followed Michaelis–Menten type kinetics with respect to the substrate. The Vmax and KM values obtained being 5.03×10−4Ms−1 and 1.60×10−3M for complex 1, 3.57×10−4Ms−1 and 1.42×10−3M for complex 2 and 1.47×10−5Ms−1 and 2.94×10−4M for complex 3, respectively. The binding efficacy of the synthesized complexes with BSA were studied using fluorescence spectroscopy and found that the binding affinity values are 2.25×108M−1 for 1, 2.13×108M−1 for 2 and 2.41×108M−1 for complex 3.

The comparative catalytic activities of iron phosphides, FexP (x = 1–3), have been established with phase-pure material grown by chemical vapor deposition (CVD) from single-source organometallic precursors. This is the first report of the preparation of phase-pure thin films of FeP and Fe2P, and their identity was established with scanning-electron microscopy, X-ray photoelectron spectroscopy, and powder X-ray diffraction. All materials were deposited on fluorine-doped tin oxide (FTO) for evaluation of their activities toward the hydrogen evolution reaction (HER) of water splitting in 0.5 M H2SO4. HER activity follows the trend Fe3P > Fe2P > FeP, with Fe3P having the lowest overpotential of 49 mV at a current density of 10 mA cm–2. Density functional theory (DFT) calculations are congruent with the observed activity trend with hydrogen binding favoring the iron-rich terminating surfaces of Fe3P and Fe2P over the iron-poor terminating surfaces of FeP. The results present a clear trend of activity with iron...

Low-spin manganese(II) complexes [Mn-II(H(2)slox)]center dot(HO)-O-2 (1), [Mn-II(H(2)slox)(SL)] (where SL (secondary ligand) = pyridine (py, 2), 2-picoline (2-pic, 3), 3-picoline (3-pic, 4), and 4-picoline (4-pic, 5) and high-spin manganese(III) complex Na(H2O)(4)[Mn-III(slox)(H2O)(2)].2.5H(2)O have been synthesized from dis-alicyaldehyde oxaloyldihydrazone in methanolic - water medium. The composition of complexes has been established by elemental analyses and thermoanalytical data. The structures of the complexes have been discussed on the basis of data obtained from molar conductance, UV visible, H-1 NMR, infrared spectra, magnetic moment and electron paramagnetic resonance spectroscopic studies. Conductivity measurements in DMF suggest that the complexes (1-5) are non-electrolyte while the complex (6) is 1:1 electrolyte. The electronic spectral studies and magnetic moment data suggest five coordinate square pyramidal structure for the complexes (2-5) and square planar geometry for manganese(II) in complex (1). In complex (6), both sodium and manganese(III) have six coordinate octahedral geometry. IR spectral studies reveal that the dihydrazone coordinates to the manganese centre in keto form in complexes (1-5) and in enol form in complex (6). In all complexes, the ligand is present in anti-cis configuration. Magnetic moment and EPR studies indicate manganese in +2 oxidation state in complexes (1-5), with low-spin square planar complex (1) and square pyramidal stereochemistries complexes (2-5) while in +3 oxidation state in high-spin distorted octahedral stereochemistry in complex (6). The complex (1) involves significant metal - metal interaction in the solid state. All of the complexes show only one metal centred electron transfer reaction in DMF solution in cyclic voltammetric studies. The complexes (1-5) involve Mn-II -> Mn-I redox reaction while the complex (6) involves Mn-III -> Mn-II redox reaction, respectively. (C) 2017 Elsevier B.V. All rights reserved.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The cover picture shows the fluorescence studies of the complex and the H…O interaction in the solid state of the crystal structure. The spectra were recorded on successive addition of Al(III) ions (0-4) equivalents. The structure of the complex was elucidated with the help of Single X-ray Crystallography. On the bottom of the cover picture, we have represented the ball and stick model of the structure for complex, each arrow pointing towards the results obtained from the sensing experimental (right) and on the left H…O interaction present in the structural unit of complex. Details are discussed in the article by Kurbah et al. on page 794 ff.

Two new heterobimetallic complexes of the composition [(VO2)(2)((3)-slsch){Na-2(-H2O)(2)(H2O)(2)}](n) (1) and [(VO2)(2)((3)-npsch){Na-2(-H2O)(2)(H2O)(2)}(DMF)](n) (2) were obtained by reaction of the ligand and vanadium pentoxide in a 1:1 molar ratio in methanol in the presence of Na2CO3 (2 equivalents). The complexes obtained were characterized using various spectroscopic studies. The structures of both the complexes were established by single crystal X-ray crystallographic study. We have also explored the catalytic behavior of the complexes in oxidative bromination of phenol red, which is the bio-inspired reaction catalyzed by an enzyme haloperoxidase. [GRAPHICS] .

A copper(II)-nickel(II)-based catalyst system has been synthesized and characterized by elemental analysis, molar conductance, mass spectra, magnetic moment, EPR, UV-Vis, IR spectroscopy, and cyclic voltammetry. The structure of the complex was established by X-ray crystallography. The complex is an efficient catalyst, which oxidizes primary and secondary alcohols to the corresponding aldehydes and ketones at 70 degrees C employing 15% H2O2 as the oxidant in the absence of a base and co-catalyst.[GRAPHICS].

Dioxidovanadium(V) complex containing hydrazone ligand has been synthesized in good yield, the complexes was characterized by elemental analysis, IR, UV–Visible and 1H NMR spectroscopy. The structure of the complex has been established by Single Crystal X-ray diffraction technique. Complex crystallized with monoclinic P21/n space group with cell parameters a/Å=11.9791(7), b/Å=19.7898(10), c/Å=16.4661(9), α/°=90, β/°=106.059(6), and γ/°=90, respectively. The ligand bonded to metal ion in tridentate fashion through ONO donor atoms forming a distorted square pyramidal geometry around vanadium and sodium ion with their geometrical index τ=0.33 and τ=0.12. The binding interaction of the synthesized complex with protein (BSA) was also studied and KBSA was found to be 2.712×107M−1.

Bimetallic molybdenum(VI) complex [(MoO2)2(slsch)(H2O)2] containing dihydrazone ligand was synthesized by reaction of ligand with MoO2(acac)2 in 1:2M ratio in methanol. The bimetallic complex obtained was characterized by various spectroscopic studies. The structure of complex was assigned using Single Crystal X-ray Crystallography and DFT method. We have also explored the catalytic behavior of complex for oxidation of primary benzylic, aliphatic, allylic, and propargylic alcohols.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Background: The oxidation of alcohols to afford carbonyl compounds is a key transformation in organic chemistry. Significant development has occurred in the recent years, in catalytic oxidation of alcohols by aerial oxygen. However, the alcohol oxidation mediated by H2O2 is quite meagre. From economic and environmental point of views, the oxidation of alcohols mediated by H2O2 is quite attractive in particular.Methods: Various alcohols Cu-3(slmh)(mu-Cl)(2)(CH3OH)(3)].0.5CH(3)OH, ligand, H2O2, CDCl3, Tetramethylsilane were used for oxidation of alcohols to carbonyl compounds. For analysis, IR, H-1 NMR, and C-13 NMR were utilized.Results: Taking benzyl alcohol as a model compound, first reaction conditions were optimized. The combination of catalyst (0.04 mmol, 0.032 mg), 15% H2O2 (8.83 mmol, 2 mL) at 70 degrees C under solvent free condition was found to be the most appropriate condition for the oxidation of alcohols. The efficiency of the catalyst was tested by oxidizing several aromatic ring substituted benzyllic, aliphatic and allylic alcohols by H2O2. We efficiently carried out oxidation of nineteen alcohols. The benzyl alcohols bearing electron withdrawing groups gave excellent yield of the corresponding carbonyl compounds whereas those bearing electron donating substituent gave slightly lower conversions. The heteroaroyl alcohols also gave excellent yield. The hydroxy group was oxidized selectively to aldehyde in cinnamyl alcohol keeping double bond intact. Secondary alcohols such as cyclohexane and 1-phenylethanol were negligibly oxidized. The aliphatic alcohols gave much lower yield as compared to benzyllic and allylic alcohols.Conclusion: The benzyllic, aliphatic and allylic alcohols were effectively oxidized to aldehydes by hydrogen peroxide using catalytic amount of Cu-3(slmh)(mu-Cl)(2)(CH3OH)(3)].0.5CH(3)OH. The process is simple and mild, the catalyst can be recycled to get improved catalytic activity.