Enhanced catalytic activity and magnetization of encapsulated nickel Schiff-base complexes in zeolite-Y: a correlation with the adopted non-planar geometry

2016 ◽  
Vol 45 (47) ◽  
pp. 18967-18976 ◽  
Author(s):  
Archana Choudhary ◽  
Bidisa Das ◽  
Saumi Ray
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Catalytic Activity ◽  
Zeolite Y ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Catalytic Activities ◽  
Square Planar ◽  
Optical And Magnetic Properties

Square planar Ni(ii)-Schiff base complexes when encapsulated in a supercage of zeolite Y have shown altered optical and magnetic properties and catalytic activities in comparison to their corresponding free states.

scholarly journals Synthesis, Characterization, and Magnetic and Thermal Studies on Some Metal(II) Thiophenyl Schiff Base Complexes

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Aderoju Amoke Osowole
Keyword(s):  
Schiff Base ◽  
Elemental Analysis ◽  
Thermal Studies ◽  
Schiff Base Complexes ◽  
Magnetic Data ◽  
Planar Geometry ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Square Planar

4-(Thiophen-3-yl)-aniline undergoes condensation with o-vanillin to form an ONS donor Schiff base, 2-methoxy-6-[(4-thiophene-3-yl-phenylimino)-methyl]-phenol, which forms complexes of the type [ML2]xH2O (where M = Mn, Co, Ni, Cu, Zn, Pd). These complexes are characterized by elemental analysis, 1H nmr, electronic, mass, and IR spectroscopies and conductance measurements. The electronic, IR and CHN data are supportive of a 4-coordinate tetrahedral geometry for Mn(II), Co(II), Ni(II), and Zn(II) complexes and square-planar geometry for Cu(II) and Pd(II) complexes, with the chromophores N2O2. The magnetic data reveals that the complexes are magnetically dilute and mononuclear with exception of the Cu(II) complex, which exhibits some anti-ferromagnetisms. The complexes are air-stable solids, and none is an electrolyte in nitro methane.

scholarly journals Studies on Some Hetero Binuclear Copper(II) Schiff base Complexes

2020 ◽  
Vol 36 (05) ◽  
pp. 954-957
Author(s):  
Shivani Prakash ◽  
Anju Kumari Gupta ◽  
Sachin Prakash ◽  
D. Prakash
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Condensation Reaction ◽  
Molar Conductance ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Binuclear Complexes ◽  
Binuclear Copper ◽  
Conductance Measurement ◽  
Square Planar

A series of new hetero binuclear complexes of copper(II) and lead(II) using Schiff base have been synthesized. The Schiff base has been derived from the condensation reaction between Salicylaldehyde and 1,2-Ethylenediamine. The hetero binuclear complexes have been characterized by using elemental analysis, molar conductance measurement, magnetic susceptibility studies, UV-Vis and IR spectra. The studies revealed square planar geometry for the complexes with coordination number four.

An insight into the catalytic activity of palladium Schiff-base complexes towards the Heck coupling reaction: routes via encapsulation in zeolite-Y

2019 ◽  
Vol 48 (42) ◽  
pp. 15942-15954
Author(s):  
Susheela Kumari ◽  
Bidisa Das ◽  
Saumi Ray
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Palladium Complex ◽  
Zeolite Y ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Heck Coupling ◽  
Guest Complex ◽  
Insight Into ◽  
Reaction Routes

Encapsulation of palladium complex within the supercage of zeolite-Y moulds the guest complex such a way that it exhibits an exciting reactivity towards the Heck coupling by eliminating aggregation and tuning electron density of the metal.

scholarly journals Crystal structure, Hirshfeld surface analysis and computational study of bis(2-{[(2,6-dichlorobenzylidene)hydrazinylidene]methyl}phenolato)cobalt(II) and of the copper(II) analogue

2020 ◽  
Vol 76 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Rohit B. Manawar ◽  
Mayank J. Mamtora ◽  
Manish K. Shah ◽  
Mukesh M. Jotani ◽  
Edward R. T. Tiekink
Keyword(s):  
Schiff Base ◽  
Benzene Ring ◽  
Computational Study ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Site Symmetry ◽  
Π Interactions ◽  
Square Planar ◽  
Benzene Rings ◽  
Dispersion Terms

The title homoleptic Schiff base complexes, [M(C14H9Cl2N2O)2], for M = CoII, (I), and CuII, (II), present distinct coordination geometries despite the Schiff base dianion coordinating via the phenolato-O and imine-N atoms in each case. For (I), the coordination geometry is based on a trigonal bipyramid whereas for (II), a square-planar geometry is found (Cu site symmetry \overline{1}). In the crystal of (I), discernible supramolecular layers in the ac plane are sustained by chlorobenzene-C—H...O(coordinated), chlorobenzene-C—H...π(fused-benzene ring) as well as π(fused-benzene, chlorobenzene)–π(chlorobenzene) interactions [inter-centroid separations = 3.6460 (17) and 3.6580 (16) Å, respectively]. The layers inter-digitate along the b-axis direction and are linked by dichlorobenzene-C—H...π(fused-benzene ring) and π–π interactions between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.6916 (16) and 3.7968 (19) Å, respectively] . Flat, supramolecular layers are also found in the crystal of (II), being stabilized by π–π interactions formed between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.8889 (15) and 3.8889 (15) Å, respectively]; these stack parallel to [10\overline{1}] without directional interactions between them. The analysis of the respective calculated Hirshfeld surfaces indicate diminished roles for H...H contacts [26.2% (I) and 30.5% (II)] owing to significant contributions by Cl...H/H...Cl contacts [25.8% (I) and 24.9% (II)]. Minor contributions by Cl...Cl [2.2%] and Cu...Cl [1.9%] contacts are indicated in the crystals of (I) and (II), respectively. The interaction energies largely arise from dispersion terms; the aforementioned Cu...Cl contact in (II) gives rise to the most stabilizing interaction in the crystal of (II).

Two New Quadridentate Schiff Base Complexes of Nickel(II) and Cobalt(III): Synthesis, Structure and Spectral Characterisation

2006 ◽  
Vol 61 (10) ◽  
pp. 1209-1216 ◽  
Author(s):  
Joy Chakraborty ◽  
Raj K. Bhubon Singh ◽  
Brajagopal Samanta ◽  
Chirantan Roy Choudhury ◽  
Subrata K. Dey ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Metal Centers ◽  
Cell Parameters ◽  
Square Planar ◽  
Elemental Analyses ◽  
Spectral Characterisation

Two novel quadridentate Schiff base complexes, [NiIILH](ClO4)2・H2O (1) and [CoIIIL]- (ClO4)2・H2O (2) [LH, a Schiff base ligand: Ph(OH)C(Me)=NCH2CH2N(CH2CH2NH2)2] have been synthesised and characterised by elemental analyses, spectroscopic and electrochemical studies. The structures of both have been unequivocally established from single crystal X-ray diffraction studies. 1 and 2 crystallise in the monoclinic space group P21/n having cell parameters a = 8.536(1), b = 13.832(4), c = 18.194(2) Å , β = 100.00(10)°, Z = 4 for 1, and a = 10.819(5), b = 14.301(2), c=14.224(1) Å , β =97.04(2)°, Z =4 for 2. The complexes expose a square planar geometry around the metal centers chelated with three different types of nitrogen donor centers of the ligand.

scholarly journals Syntheses and Characterization of Some Tetradentate Schiff-Base Complexes and Their Heteroleptic Analogues

2008 ◽  
Vol 5 (1) ◽  
pp. 130-135 ◽  
Author(s):  
A. A. Osowole
Keyword(s):  
Schiff Base ◽  
Magnetic Moments ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Spectral Measurements ◽  
Tetradentate Schiff Base ◽  
Heteroleptic Complexes ◽  
Square Planar ◽  
Elemental Analyses

VO(IV), Ni(II) and Cu(II) complexes of the asymmetric Schiff base [(HOC6H3(OCH3)C(C6H5):N(CH2CH2)N:C(CH3)CH:C(C6H5)OH)], and their heteroleptic analogues with triphenyl phosphine and 2,2’-bipyridine have been synthesized and characterized by elemental analyses, conductance, magnetic, infrared and electronic spectral measurements. The ligand is tetradentate coordinatingviathe imine N and enolic O atoms. The Ni(II) and Cu(II) complexes adopt a four coordinate square planar geometry, the VO(IV) complex is five coordinate square-pyramidal and the heteroleptic complexes are 6-coordinate, octahedral. The assignment of geometry is collaborated by magnetic moments and electronic spectra measurements. The compounds are non-electrolyte in nitromethane and are magnetically dilute.

{1-[2-(Methylamino)ethyliminomethyl]naphthalen-2-olato}thiocyanatocopper(II)

2006 ◽  
Vol 62 (7) ◽  
pp. m1533-m1534 ◽  
Author(s):  
Han-Na Hou
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Title Compound ◽  
Planar Geometry ◽  
Asymmetric Unit ◽  
Thiocyanate Anion ◽  
Square Planar

The title compound, [Cu(C14H15N2O)(NCS)], is a mononuclear copper(II) complex, with two molecules in the asymmetric unit. The CuII ion is coordinated by one O and two N atoms of a Schiff base ligand, and by one N atom of a thiocyanate anion, forming a square-planar geometry.

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