A novel Cu(II) dimer containing oxime-hydrazone Schiff base ligands with an unusual mode of coordination: Study of magnetic, autoreduction and solution properties

Sutradhar, Manas; Barman, Tannistha Roy; Klanke, Julia; Drew, Michael G. B.; Rentschler, Eva

doi:10.1016/j.poly.2012.12.039

Cited by 41 publications

(12 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[22][23][24] The cis-[Mo VI O 2 ] 2+ complexes of Schiff bases having ONO donor sites have drawn much attention due to their interesting catalytic properties. [22][23][24] The cis-[Mo VI O 2 ] 2+ complexes of Schiff bases having ONO donor sites have drawn much attention due to their interesting catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of secondary alcohols by conventional and microwave-assisted methods using molybdenum complexes of ONO donor ligands

2015

View full text Add to dashboard Cite

New dioxidomolybdenum(VI) complexes, [Mo VI O 2 {Hdfmp(bhz) 2 }(MeOH)] 1, [Mo VI O 2 {Hdfmp(inh) 2 }(MeOH)] 2 and [Mo VI O 2 {Hdfmp(nah) 2 }(MeOH)] 3 of ligand H 3 dfmp(L) 2 I, are obtained by the condensation of 2,6diformyl-4-methylphenol (dfmp) and hydrazides (L) [L = benzoylhydrazide (bhz), isonicotinoylhydrazide (inh), and nicotinoylhydrazide (nah)], respectively. All these complexes are characterized in the solid state and in solution namely by elemental analyses, spectroscopic techniques (IR, electronic, 1 H and 13 C NMR) and thermogravimetric analyses. Single crystal X-ray analysis of complexes 1 and 3 confirms the coordination of the ligand in the dianionic (ONO 2À ) enolate-tautomeric form and one of the hydrazido moieties remains non-coordinated. Oxidation of secondary alcohols: 1-phenyl ethanol, 2-propanol and 2-butanol, catalyzed by these molybdenum complexes, using conventional liquid phase and microwaveassisted methods in the presence of 30% H 2 O 2 as an oxidant has been tested. The effects of various factors, such as temperature and amounts of catalyst, H 2 O 2 and solvent have been investigated. These alcohols under the optimized reaction conditions gave high yields of the respective ketone. Addition of an N-based additive reduces the reaction time considerably. Amongst the two methods studied, the microwave technique proves to be a time efficient system.

show abstract

Section: Introductionmentioning

confidence: 99%

Oxidation of secondary alcohols by conventional and microwave-assisted methods using molybdenum complexes of ONO donor ligands

2015

View full text Add to dashboard Cite

show abstract

“…On the other hand, hydrazone Schiff bases are useful and versatile pro-ligands for the synthesis of a huge variety of coordination compounds [25][26][27][28][29][30]. Though there is a number of Ni(II) complexes with hydrazone Schiff bases, it appears that they have not yet been explored for the catalytic Henry reaction.…”

Section: Introductionmentioning

confidence: 99%

A new cyclic binuclear Ni(II) complex as a catalyst towards nitroaldol (Henry) reaction

Sutradhar

Silva

Pombeiro

2014

Catalysis Communications

Self Cite

View full text Add to dashboard Cite

“…The design and synthesis of suitable multidentate ligands provide a significant contribution for the development of coordination chemistry, where two class of ligands having the azine fragment (C=N—N=C) and oxime fragment (C=N—OH) appear to be of very important types. Recently, a large number of papers have appeared in the literature dealing with the synthesis, structure and magnetic properties of oxime‐containing complexes . The oximes are able to coordinate to different metal ions in different modalities and their properties can be tunable easily by the alteration of the substituents.…”

Section: Introductionmentioning

confidence: 99%

Oxime derivative unsymmetrical azine, its Ni(II), Cu(II) and Zn(II) complexes: Synthesis, spectroscopy and catecholase activity

Serbest

Göktekin

Karaoğlu

et al. 2018

Heteroatom Chemistry

View full text Add to dashboard Cite

1‐[(Z)‐{(2E)‐[(3E)‐3‐(hydroxyimino)butan‐lidene]hydrazinylidene}methyl]naphthalen ‐2‐ol, H2L (3) was synthesized by the agents of 2‐hydroxy‐1‐naphtaldehyde, 2,3‐butanedione monoxime and hydrazine in two steps. The structures of the compounds have been proposed by elemental analyses, spectroscopic data, that is, IR, 1H NMR, UV‐vis, X‐ray, mass spectra (ESI or TOF), molar conductivities and magnetic susceptibility measurements. The ligand has potentially three nitrogens and an oxygen donor to be able to bind a metal center. In the light of analytical and physical results, it was suggested that the ligand may coordinate to by N,O/N2/N2O donor set to form square planar, octahedral, distorted square planar and tetrahedral complexes. Proton NMR evidence indicating that the ligand coordinates the metal ion through the phenolic oxygen and nitrogen of imine in the nickel and zinc complexes. Molar conductivity measurements reveal that all the complexes are non‐electrolytes. In addition, catecholase activities of the complexes were studied. However, the only one of the complexes, 1b, behaves as an effective catalyst toward oxidation of 3,5‐di‐tert‐butylcatechol (3,5‐DTBC) to its corresponding quinone derivative in MeOH saturated with O2. The reaction follows Michaelis‐Menten enzymatic reaction kinetics with turnover numbers (kcat) 1.19 × 103/hour.

show abstract

A novel Cu(II) dimer containing oxime-hydrazone Schiff base ligands with an unusual mode of coordination: Study of magnetic, autoreduction and solution properties

Cited by 41 publications

References 58 publications

Oxidation of secondary alcohols by conventional and microwave-assisted methods using molybdenum complexes of ONO donor ligands

Oxidation of secondary alcohols by conventional and microwave-assisted methods using molybdenum complexes of ONO donor ligands

A new cyclic binuclear Ni(II) complex as a catalyst towards nitroaldol (Henry) reaction

Oxime derivative unsymmetrical azine, its Ni(II), Cu(II) and Zn(II) complexes: Synthesis, spectroscopy and catecholase activity

Contact Info

Product

Resources

About