scholarly journals Synthesis, Characterization, and Structural Assessment of Ni(II) Complexes Derived from Bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Mithun Chakrabarty ◽  
Aziz Ahmed ◽  
R. A. Lal
Keyword(s):  
Coordination Sphere ◽  
Magnetic Moment ◽  
Spectroscopic Studies ◽  
Molar Conductance ◽  
Structural Assessment ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Oxygen Atoms

The monometallic nickel(II) complexes [Ni(H2nsh)(A)2]·nH2O (where A = water (H2O), n=0 (1); pyridine (py), n=2 (2); 2-picoline(2-pic), n=0 (3); 3-picoline(3-pic), n=2 (4); and 4-picoline(4-pic), n=0 (5)) and homobimetallic nickel(II) complexes [Ni2(nsh)(A)4]·nH2O (where A = water (H2O), n=1 (6); pyridine (py), n=4 (7); 2-picoline(2-pic), n=4 (8); 3-picoline(3-pic), n=4 (9); and 4-picoline(4-pic), n=4 (10), resp.) have been synthesized in methanol from bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone (H4nsh). The complexes have been characterized by elemental analyses, molar conductance, magnetic moment, and electronic and IR and TGA/DTA spectroscopic studies. The monometallic complexes (1) to (5) are found to have octahedral stereochemistry while complexes (6) to (10) are found to have distorted octahedral stereochemistry in which one of the Ni(II) centres is present in N2O2 coordination sphere and another Ni(II) centre is bonded to it through phenolate oxygen atoms via oxo-bridging.

Structural and spectroscopic studies of transition metal nitrite complexes. X. Crystal structures of cis-Bis(2,2'-bipyridine)(nitrito-O,O')nickel(II) nitrate and hydrated Tris(2,2'-bipyridine)nickel(II) nitrite/nitrate and sulfate. Stereochemistry of the [M(bidentate ligand)2(bidentate ligand')1] system

1981 ◽  
Vol 34 (10) ◽  
pp. 2177 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
DL Kepert ◽  
CL Raston ◽  
GL Rowbottom ◽  
...  
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Coordination Sphere ◽  
Nickel Atom ◽  
Spectroscopic Studies ◽  
Bidentate Ligand ◽  
The Other ◽  
Bidentate Ligands ◽  
Nitrite Nitrate ◽  
Oxygen Atoms

The crystal structures of the title compounds are reported. In all cases, the coordination sphere of the nickel atom comprises three bidentate ligands. In (1), [Ni(bpy)2(O2N)] NO3, (Ni-N) is 2.M2 � although there are small differences between those nitrogen atoms trans to the nitrite oxygen atoms and the other two. (Ni-O) is 2.12 �. In (2), [Ni(bpy)3] NO2/NO3,xH2O, and (3), [Ni(bpy)3]- SO4,7.5H2O, a redetermination, Ni-N is shown to be c. 2.09 �; serious disorder is present among the non-cationic components of (2), precluding a definite assignment of stoichiometry.

A Rare Example of a Dinuclear Cobalt(II) Complex with Dipicolinate and Bridging 2-Aminopyrazine Ligands. Preparation, Structural, Spectroscopic and Thermal Characterization

2011 ◽  
Vol 66 (8) ◽  
pp. 813-818 ◽  
Author(s):  
Masoumeh Tabatabaee ◽  
Boris-Marko Kukovec ◽  
Vajieh Razavimahmoudabadi
Keyword(s):  
Dipicolinic Acid ◽  
3D Structure ◽  
Thermal Characterization ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Coordination Environment ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Coordinated Water ◽  
Oxygen Atoms

A dinuclear cobalt(II) complex, [Co2(H2O)4(dipic)2(μ-apyz)] (dipicH2 = pyridine-2,6-dicarboxylic (dipicolinic) acid, apyz = 2-aminopyrazine) (1), has been hydrothermally synthesized and characterized by elemental analyses, spectroscopic methods (IR, UV/Vis), thermal analysis as well as by X-ray diffraction studies. The dinuclear complex is composed of two cobalt(II) ions bridged by a 2-aminopyrazine molecule. Each cobalt(II) ion is coordinated by one nitrogen and two oxygen atoms of the tridentate dipicolinate anion, one heterocyclic nitrogen atom of the 2-aminopyrazine and two oxygen atoms of coordinated water molecules. The resulting geometry for the CoN2O4 coordination environment can be described as distorted octahedral. Various hydrogen bonds of the type O-H···O and N-H···O are also present in the crystal structure. This arrangement leads to the formation of a 3D structure.

A dinuclear nickel(II) complex derived from an asymmetric Salamo-type N2O2 chelate ligand: synthesis, structure and optical properties

2017 ◽  
Vol 72 (6) ◽  
pp. 415-420 ◽  
Author(s):  
Xiu-Yan Dong ◽  
Quan-Peng Kang ◽  
Bo-Xian Jin ◽  
Wen-Kui Dong
Keyword(s):  
Optical Properties ◽  
Molar Conductance ◽  
Crystallographic Analysis ◽  
Chelate Ligand ◽  
X Ray ◽  
Coordination Site ◽  
Pyridine Nitrogen ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Ft Ir

AbstractA new dinuclear Ni(II) complex, [{Ni(L)(C5H5N)}2], has been synthesized with 4-chloro-4′,6′-dibromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]diphenol (H2L), and characterized by elemental analyses, FT-IR, UV/Vis, molar conductance and X-ray crystallographic analysis. Each Ni(II) atom is located at a N2O2 coordination site of a completely deprotonated (L)2− unit. Two μ-phenoxo oxygen atoms from two [Ni(L)] units and two pyridine nitrogen atoms coordinate with two Ni(II) atoms. The two hexa-coordinated Ni(II) atoms have slightly distorted octahedral geometries. The μ-phenoxo bridges play important roles in assembling Ni2+ and (L)2− units. This 2:2 (Ni2+:(L)2−) structure is different from that of other Salamo-type Ni(II) complexes reported earlier.

scholarly journals Cis-Dioxomolybdenum (VI) Complexes with N-donor Macrocyclic Ligands

2021 ◽  
Vol 12 (1) ◽  
pp. 1352-1364
Keyword(s):  
Schiff Base ◽  
Coordination Number ◽  
Thermal Studies ◽  
Molar Conductance ◽  
Macrocyclic Ligands ◽  
Molybdenum Metal ◽  
Distorted Octahedral ◽  
Elemental Analyses

The preparation of one monomeric [MoO2(L)](acac)2 having a Schiff base came by condensation of di-2-furanylethanedione with 2,3-diaminotoluene and 4 different complexes having formulation [MoO2(ML)](acac)2, from the result of [MoO2(L)](acac)2 with 1,3-diketones will be described with this paper. The preparation of each of these five MoO2 (VI) complexes was symbolized by thermal studies, UV-Vis, IR, elemental analyses, NMR, and molar conductance. The coordination number of molybdenum metal will be six. All 5 complexes of MoO2(VI) have a geometry of distorted octahedral arrangement. The octahedral arrangement of Mo-metal in prepared complexes is finished by 2 oxo O-atoms and 4 N-atoms from the synthesized ligand. All of the synthesized complexes demonstrated moderate action against S. aureus and S. typhi. The progression inside the antibacterial task being defined on the thought of chelation speculation.

scholarly journals Synthesis and Antibacterial Activity of Novel Molybdenum Complexes with Macrocyclic Schiff Base Derived from Furanylethanedione

2019 ◽  
Vol 31 (11) ◽  
pp. 2607-2612
Author(s):  
Ramesh Kumar Gautam ◽  
Chandra Prakash Singh ◽  
Shiv Govind Prasad ◽  
Rajul Saxena ◽  
Devendra Pratap Rao
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Thermal Studies ◽  
Molar Conductance ◽  
Moderate Activity ◽  
Octahedral Structure ◽  
Molybdenum Metal ◽  
Distorted Octahedral ◽  
Elemental Analyses ◽  
Macrocyclic Schiff Base

A new MoO2(VI) complex of formulation [MoO2(L)](acac)2 prepared by a Schiff base, synthesized via reaction of di-2-furanylethanedione with 5-chloropyridine-2,3-diamine and four new MoO2(VI) complexes having formule [MoO2(ML)](acac)2, derived from cyclization of [MoO2(L)](acac)2 with β-diketones are reported in this work. The synthesized MoO2(VI) complexes were characterized on the basis of various analyses like thermal studies, UV-Vis, elemental analyses, NMR, IR and molar conductance. The coordination number of molybdenum metal is six. All the MoO2(VI) complexes have distorted octahedral structure in which Mo atom is coordinated with two O-atoms and four N-atoms. All the complexes show moderate activity against S. typhi and S. aureus. Advancement in the antibacterial task is thought to be of chelation speculation.

scholarly journals Synthesis of Oxovanadium(IV) Complexes with Tetraaza Coordinating Ligands

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Sanjay Singh ◽  
Hardeo S. Yadav ◽  
Ashok Kumar Yadava ◽  
Devendra Pratap Rao
Keyword(s):  
Magnetic Moments ◽  
Spectroscopic Studies ◽  
Molar Conductance ◽  
Pyramidal Geometry ◽  
Vanadyl Ion ◽  
Spin Resonance ◽  
Elemental Analyses ◽  
Resonance Data ◽  
Electron Spin Resonance Data ◽  
Square Pyramidal Geometry

Oxovanadium(IV) complexes of the type [VO(mac)]SO4(where mac = tetraaza macrocyclic ligands derived by condensation of thenil with 1,4-diaminobenzene or 3,4-diaminopyridine and their reaction withβ-diketones) have been prepared using vanadyl ion as kinetic template. The prepared macrocyclic complexes were characterized by elemental analyses, molar conductance, magnetic moments, and infrared, electronic, and electron spin resonance data. From the spectroscopic studies, five-coordinate square-pyramidal geometry for the VO2+complexes have been proposed wherein derived ligands act as tetradentate chelating agents.

Basic Chromium(III) Carboxylates: Reactions of Chromium(III) Chloride with Some Carboxylic Acids

1979 ◽  
Vol 34 (10) ◽  
pp. 1369-1372 ◽  
Author(s):  
Ramesh Kapoor
Keyword(s):  
Acetic Anhydride ◽  
General Formula ◽  
Carboxylic Acids ◽  
Magnetic Measurements ◽  
Molar Conductance ◽  
Strong Affinity ◽  
Elemental Analyses

Abstract Anhydrous chromium(III) chloride reacts with pure carboxylic acids (RCOOH where R = CH3, C2H5, n-C3H7, CH2Cl, CHCl2 and CCl3) to give basic trinuclear chromium(III) carboxylates of the general formula [Cr3O(OOCR)6]+Cl-. The reaction of CrCl3 with acetic anhydride, however, gives a partially substituted product, CrCl(OOCCH3)2.The formation of basic carboxylates has been attributed to the strong affinity of Cr3+ ions for water that they can abstract it even from pure carboxylic acids. Their addition compounds with ammonia have also been prepared. The compounds have been characterized by their elemental analyses, IR, molar conductance and magnetic measurements.

Studies of Distorted Octahedral Complexes of Cobalt, Nickel and Copper and Their Antibacterial Properties

2018 ◽  
Vol 34 (4) ◽  
pp. 1937-1944 ◽  
Author(s):  
Vijay Kumar ◽  
Rajiv Kumar Singh ◽  
Veena Kumari ◽  
Birendra Kumar ◽  
Shivadhar Sharma
Keyword(s):  
Magnetic Moment ◽  
Electronic Spectra ◽  
Antibacterial Properties ◽  
Octahedral Geometry ◽  
Azomethine Nitrogen ◽  
Distorted Octahedral Geometry ◽  
Octahedral Symmetry ◽  
Orbital Contribution ◽  
Distorted Octahedral ◽  
Crystal Field Parameters

The ligand, 3-hydroxy-4-methoxybenzaldehydethiosemicarbazone has been prepared by the condensation of 3-hydroxy-4-methoxybenzaldehyde and thiosemicarbazide. With the help of this ligand the complexes of Co(II), Ni(II) and Cu(II) have been prepared with general formula [ML2X2] where X is secondary ligand, Cl–, NO3– and CH3COO–. The composition of complexes has been established by their microanalysis, while the metal contents have been determined gravimetrically and volumetrically. On the basis of IR spectra, the coordinating mode of ligand has been determined and has been found to have coordinated through azomethine nitrogen and thione sulphur. The magnetic moment of Co(II) complexes has been found between 4.96-4.72 B. M. The value is slightly higher than the μs value corresponding to three unpaired electrons (3.872 B.M). The increase in value may be attributed to orbital contribution from 4T1g ground state cubic term. The appearance of four bands in their electronic spectra is indicative of tetragonally distorted octahedral geometry of Co(II) complexes. The magnetic moment (3.20-3.30 B. M.) and appearance of 4 bands in the electronic spectra of Ni(II) complexes confirms the distorted octahedral geometry of the complexes. The magnetic moment of Cu(II) complexes has been determined to be (1.95-2.20 B. M.) which shows that Cu(II) complexes are magnetically dilute complexes. The appearance of three bands in their electronic spectra confirms John - Tellor distortion in octahedral symmetry of Cu(II) complexes. The various crystal field parameters exhibiting tetragonal distortion in the octahedral symmetry have also been derived. The positive value of Dt predicts tetragonal elongation in Oh symmetry.

scholarly journals Crystal structure of 2-methyl-1H-imidazol-3-ium aquatrichlorido(oxalato-κ2O,O′)stannate(IV)

2015 ◽  
Vol 71 (5) ◽  
pp. 520-522 ◽  
Author(s):  
Mouhamadou Birame Diop ◽  
Libasse Diop ◽  
Laurent Plasseraud ◽  
Thierry Maris
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Three Dimensional ◽  
Free Oxygen ◽  
Coordination Environment ◽  
Dimensional Network ◽  
Oxalate Ligand ◽  
Distorted Octahedral ◽  
Distorted Octahedral Coordination Environment ◽  
Oxygen Atoms

The tin(IV) atom in the complex anion of the title salt, (C4H7N2)[Sn(C2O4)Cl3(H2O)], is in a distorted octahedral coordination environment defined by three chlorido ligands, an oxygen atom from a water molecule and two oxygen atoms from a chelating oxalate anion. The organic cation is linked through a bifurcated N—H...O hydrogen bond to the free oxygen atoms of the oxalate ligand of the complex [Sn(H2O)Cl3(C2O4)]−anion. Neighbouring stannate(IV) anions are linked through O—H...O hydrogen bonds involving the water molecule and the two non-coordinating oxalate oxygen atoms. In combination with additional N—H...Cl hydrogen bonds between cations and anions, a three-dimensional network is spanned.

scholarly journals Synthesis, Characterization and Chelating Properties of Benzimidazole-Salicylic Acid Combined Molecule

2009 ◽  
Vol 6 (1) ◽  
pp. 281-288 ◽  
Author(s):  
Kamlesh V. Patel ◽  
Arun Singh
Keyword(s):  
Salicylic Acid ◽  
Transition Metal ◽  
Transition Metal Complexes ◽  
Magnetic Moment ◽  
Mannich Reaction ◽  
Conductivity Measurement ◽  
Molar Conductivity ◽  
Spectral Studies ◽  
Aminosalicylic Acid ◽  
Elemental Analyses

Aminomethylation (i.e.Mannich reaction) of benzimidazole was carried out by treating benzimidalzole with formaldehyde and 4-aminosalicylic acid. The resultant compound was designated as 1-(4-carboxy-3-hydroxyphenyl aminomethyl) benzimidazole (BI-SA). The transition metal complexes of Cu2+, Co2+, Ni2+, Mn2+, Zn2+and Fe3+of BI-SA have been prepared and characterized by elemental analyses, spectral studies, magnetic moment determination, molar conductivity measurement and microbicidal activity.

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