scholarly journals Synthesis, Molecular Modeling, and Biological Activity of Zinc(II) Salts with 1,4-Bis(benzimidazol-2-yl)benzene

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
G. Krishnamurthy
Keyword(s):  
Thermal Analysis ◽  
Molecular Modeling ◽  
Minimum Energy ◽  
Anthelmintic Activity ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Spectral Studies ◽  
Colored Complex ◽  
Colored Complexes ◽  
C Nmr

Zinc(II) halides and perchlorate react with 1,4-bis(benzimidazol-2-yl)benzene (L) in 1 : 2 molar ratio in n-butanol/2-methoxy ethanol (10 mL) at refluxing temperature to produce white/pale yellow-colored complexes of the formulae [ZnCl2L]H2O, [ZnBr2L]3H2O, and [Zn(OClO3)2L]HOCH2CH2CH2CH3. Zinc(II) iodide also reacts with L in 1 : 2 molar ratio in n-butanol (HOCH2CH2CH2CH3) to yield white-colored complex of the formula [ZnL2(OCH2CH2CH2CH3)2]. The complexes were characterized by elemental analysis, molar conductance measurements, thermal analysis, and IR,1H-,13C-NMR spectral studies. The complexes showed significant anthelmintic activity. The minimum energy configuration has been obtained for the zinc complexes using molecular modeling Pro Plus; a tool developed by ChemSW, inc, USA.

scholarly journals Synthesis, Characterization and Antifungal Studies of Adducts of p- Ethylphenyldithiocarbonates of Copper(II)

2019 ◽  
Vol 31 (8) ◽  
pp. 1819-1824
Author(s):  
Shivangi Sharma ◽  
Renu Sachar ◽  
G.D. Bajju ◽  
Vikas Sharma
Keyword(s):  
Magnetic Susceptibility ◽  
Electron Spin Resonance ◽  
Room Temperature ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Molar Ratio ◽  
Spectral Studies ◽  
Distorted Octahedral Geometry ◽  
Distorted Octahedral ◽  
Spin Resonance

A series of adducts of p-ethylphenyldithiocarbonates of copper(II) [(p-C2H5C6H4OCS2)2Cu] with ethyl pyridines and chloro pyridines have been synthesized in 1:2 molar ratio. They were characterized by elemental analysis, magnetic susceptibility and molar conductance measurements, infrared, electronic, electron spin resonance and mass spectroscopy, NMR and thermogravimetric analysis. In addition, antifungal studies of these adducts were also performed. The results revealed that the adducts have 1:2 stoichiometry, non-electrolytic and paramagnetic at room temperature. On the basis of spectral studies, a distorted octahedral geometry is proposed around copper(II) ion. ESR studies depicted elongated axial symmetry of Cu(II)adducts with nitrogen donors. Moreover, the adducts also showed potential antifungal activity against Fusarium oxysporium.

scholarly journals Synthesis, Structural, and Antimicrobial Studies of Some New Coordination Compounds of Palladium(II) with Azomethines Derived from Amino Acids

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Monika Gupta ◽  
Sangeeta Sihag ◽  
A. K. Varshney ◽  
S. Varshney
Keyword(s):  
Amino Acids ◽  
Coordination Compounds ◽  
Reaction Medium ◽  
Molar Ratio ◽  
Spectral Studies ◽  
Antimicrobial Studies ◽  
Elemental Analyses ◽  
C Nmr ◽  
Insecticidal Activities

Some new coordination compounds of palladium(II) have been synthesized by the reaction of palladium(II) acetate with azomethines in a 1 : 2 molar ratio using acetonitrile as a reaction medium. Azomethines used in these studies have been prepared by the condensation of 2-acetyl fluorene and 4-acetyl biphenyl with glycine, alanine, valine, and leucine in methanol. An attempt has been made to probe their bonding and structures on the basis of elemental analyses and IR,1H, and13C NMR spectral studies. Pd(II) compounds have been found to be more active than their uncomplexed ligands as both of them were screened for antibacterial, antifungal, and insecticidal activities.

scholarly journals Synthesis and Characterization of New Lead(II) and Organotin(IV) Complexes of Schiff Bases Derived from Histidine and Methionine

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Har Lal Singh ◽  
J. B. Singh
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Analytical Data ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Azomethine Nitrogen ◽  
Spectral Studies ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Carboxylate Oxygen

New Schiff base (HL) ligand is prepared via condensation of isatins and amino acids in 1:1 molar ratio. Metal complexes are prepared and characterized by elemental analysis, molar conductance, electronic, infrared, and multinuclear magnetic resonance (1H NMR, 13C NMR, and 119Sn NMR). The analytical data showed that the ligand acts as bidentate toward metal ions via azomethine nitrogen and carboxylate oxygen by a stoichiometric reaction of metal : ligand (1 : 2) to from metal complexes (Pb(II)(L)2 and Bu2Sn(L)2, where L is the Schiff base ligands of histidine and methionine). The conductivity values between 15 and 25 Ω−1cm2 mol−1 in DMF imply the presence of nonelectrolyte species. On the basis of the above spectral studies, distorted octahedral and tetrahedral geometry have been proposed for the resulting organotin(IV) and lead(II) complexes.

scholarly journals Biological and Spectral Studies of Newly Synthesized Triazole Schiff Bases and Their Si(IV), Sn(IV) Complexes

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Kiran Singh ◽  
Parvesh Puri ◽  
Yogender Kumar ◽  
Chetan Sharma ◽  
Kamal Rai Aneja
Keyword(s):  
Nmr Spectroscopy ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Spectral Studies ◽  
Trigonal Bipyramidal ◽  
Elemental Analyses ◽  
Bacteria And Fungi

The Schiff bases HL1-3have been prepared by the reaction of 5-bromothiophene-2-carboxaldehyde with 4-amino-5-mercapto-3-methyl/propyl/isopropyl-s-triazole, respectively. Organosilicon(IV) and organotin(IV) complexes of formulae (CH3)2MCl(L1-3), (CH3)2M(L1-3)2were synthesized from the reaction of (CH3)2MCl2and the Schiff bases in 1 : 1 and 1 : 2 molar ratio, where and Sn. The synthesized Schiff bases and their metal complexes have been characterized with the aid of various physicochemical techniques like elemental analyses, molar conductance, UV, IR,1H,13C,29Si, and119Sn NMR spectroscopy. Based on these studies, the trigonal bipyramidal and octahedral geometries have been proposed for these complexes. The ligands and their metal complexes have been screenedin vitroagainst some bacteria and fungi.

scholarly journals Synthesis, Spectral Characterization, Molecular Modeling, and Antimicrobial Studies of Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) Complexes of ONO Schiff Base

2012 ◽  
Vol 9 (4) ◽  
pp. 2145-2154 ◽  
Author(s):  
Padmaja Mendu ◽  
J. Pragathi ◽  
B. Anupama ◽  
C. Gyana Kumari
Keyword(s):  
Schiff Base ◽  
Molecular Modeling ◽  
Oxygen Atom ◽  
Schiff Base Ligand ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Azomethine Group ◽  
Pyrone Ring ◽  
Antimicrobial Studies ◽  
Benzoyl Hydrazine

A series of Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) complexes have been synthesized from the schiff base ligand L. The schiff base ligand [(4-oxo-4H-chromen-3-yl) methylene] benzohydrazide (L) has been synthesized by the reaction between chromone-3-carbaldehyde and benzoyl hydrazine. The nature of bonding and geometry of the transition metal complexes as well as schiff base ligand L have been deduced from elemental analysis, FT-IR, UV-Vis,1HNMR, ESR spectral studies, mass, thermal (TGA and DTA) analysis, magnetic susceptibility, and molar conductance measurements. Cu(II), Ni(II), Co(II), and Mn(II) metal ions are forming 1:2 (M:L) complexes, Zn(II) is forming 1:1 (M:L) complex. Based on elemental, conductance and spectral studies, six-coordinated geometry was assigned for Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) complexes. The complexes are 1:2 electrolytes in DMSO except zinc complex, which is neutral in DMSO. The ligand L acts as tridentate and coordinates through nitrogen atom of azomethine group, oxygen atom of keto group ofγ-pyrone ring and oxygen atom of hydrazoic group of benzoyl hydrazine. The 3D molecular modeling and energies of all the compounds are furnished. The biological activity of the ligand and its complexes have been studied on the four bacteriaE. coli, Edwardella, Pseudomonas, andB. subtilisand two fungipencilliumandtricodermaby well disc and fusion method and found that the metal chelates are more active than the free schiff base ligand.

Studies on Divalent Zinc and Cadmium Complexes Containing 1, 2-bis (n-methylbenzimidazolyl)benzene

2012 ◽  
Vol 11 (1) ◽  
pp. 1-14
Author(s):  
Bheemanna HG ◽  
Virupaiah Gayathri ◽  
Nadur Muddanna Nanje Gowda
Keyword(s):  
Thermal Analysis ◽  
13C Nmr ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Cadmium Complexes ◽  
1H And 13C Nmr ◽  
Mass Spectral ◽  
Pale Pink ◽  
Elemental Analyses

The reaction of 1,2-bis(N-methylbenzimidazolyl)benzene (N-N) with zinc and cadmium halides and perchlorates in teof–ethanol/acetone/thf yielded white/cream/pale pink complexes of the formulae MX2(N-N) [M = Zn, X = Cl, Br or I; M = Cd, X = Br or I), [(CdCl2)1.5(μ-N-N)]2, [Zn(OClO3)(μ-N-N)1.5]2(ClO4)2 and [Cd(OClO3)(μ-N-N)2]ClO4.H2O. The complexes have been characterized based on elemental analyses, molar conductance measurements, IR, 1H and 13C NMR, FAB–mass spectral studies and thermal analysis. Probable structures have been proposed.

scholarly journals Preparation and Spectroscopic Studies of Some Metal Ion Complexes of 2-((4-Formyl-3-Hydroxynaphthalen-2-yl) Diazenyl) Benzoic Acid

2016 ◽  
Vol 13 (2) ◽  
pp. 95-104
Author(s):  
Baghdad Science Journal
Keyword(s):  
Benzoic Acid ◽  
Gas Phase ◽  
Metal Ion ◽  
Spectroscopic Studies ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Square Planar ◽  
Ft Ir

New azo ligand 2-((4-formyl-3-hydroxynaphthalen-2-yl) diazenyl) benzoic acid (H2L) was synthesized from the reaction of 2-aminobenzoic acid and2-hydroxy-1-naphthaldehyde. Monomeric complexes of this ligand, of general formulae [MII(L)(H2O)] with (MII = Mn, Co, Ni, Cu, Zn, Pd, Cd and Hg ) were reported. The compounds were isolated and characterized in solid state by using 1H-NMR, FT-IR, UV–Vis and mass spectral studies, elemental microanalysis, metal content, magnetic moment measurements, molar conductance and chloride containing. These studies revealed tetrahedral geometries for all complexes except PdII complex is Square planar. The study of complexes formation via molar ratio of (M:L) as (1:1). Theoretical treatments of compounds in gas phase were studied using Hyper Chem-8 program has.

scholarly journals Synthesis, Characterization and Comparative Thermal degradation study of Co(II), Ni(ΙΙ) and Cu(II) complexes with Asparagine and Urea as mixed ligands

2018 ◽  
Vol 43 (4) ◽  
pp. 11
Author(s):  
Yasmin Mosa'd Jamil ◽  
Maher Ali Al-Maqtari ◽  
Fathi Mohammed Al-Azab ◽  
Mohammed Kassem Al-Qadasy ◽  
Amani A. Al-Gaadbi
Keyword(s):  
Thermal Analysis ◽  
Thermal Degradation ◽  
Analytical Data ◽  
Outer Sphere ◽  
Decomposition Reaction ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Degradation Study ◽  
Rapid Decomposition ◽  
Mixed Ligands

New Co(II), Ni(II) and Cu(II) complexes with urea and asparagine as ligands have been synthesized in (M:L1:L2) molar ratio (where M= Co(II), Ni(II) and Cu(II), L1 =urea, and  L2 =asparagine) then identified by micro analytical data, molar conductance measurements,  IR, 1HNMR, Mass, UV-VIS spectroscopies and magnetic susceptibility measurements. Thermal degradation studies were carried out by thermal analysis. These complexes have the general formula [M(L1)(L2)(H2O)n]Cl. The molar conductance values in DMSO solvent show the electrolytic nature of these complexes, indicating the outer-sphere coordination of the chloride anions with metal ions. The three complexes have an octahedral structure although urea has shown two modes of coordination. Thermal analysis study shows rapid decomposition reaction for Ni complex and the highest thermal stability for Cu complex. The kinetic parameters were determined from the thermal decomposition data using the Coats-Redfern method. Thermodynamic parameters were calculated using standard relations.

Studies on Palladium(II) Complexes Containing Multidentate N-heterocycles

2005 ◽  
Vol 2005 (8) ◽  
pp. 505-507 ◽  
Author(s):  
Shivakumaraiah ◽  
Nadur M. Nanje Gowda
Keyword(s):  
Elemental Analysis ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Mass Spectral ◽  
C Nmr ◽  
Hydrohalic Acid

Palladium dihalides/perchlorate react with the multidentate N-heterocycles (I), 1,3-bis(benzimidazol-2-yl)benzene (L1) 1,3-bis(1-methylbenzimidazol-2-yl)benzene (L2), 2,6-bis(benzimidazol-2-yl)pyridine (L3) and 2,6-bis(1-methylbenzimidazol-2-yl) pyridine (L4) in ethanol/tetrahydrofuran in presence of hydrohalic acid to yield complexes of the compositions, [PdX2L·nH2O] (X = Cl, L = L1 or L2, n = 1; X = Cl, L = L3 or L4, n = 0; X = Br, L = L1 or L3 n = 0; X = Br, L = L2, n = 3; X = Br, L = L4, n = 2), PdL2(ClO4)2·nH2O (L = L1, n = 2; L = L2, n = 1) and [Pd2L3(ClO4)4·nH2O] (L = L3, n = 2; L = L4, n = 0). The complexes were characterised by elemental analysis, molar conductance measurements, IR, electronic, 1H, 13C NMR and FAB-mass spectral studies.

scholarly journals Reaktive E=C(p–p)π Systeme, XXXIV Addition von Alkoholen oder primären Aminen an Phosphaalkene F3CP=C(F)OR. Neue Trifluormethylphosphane und -phosphaalkene/Reactive E = C( p – p ) π-Systems, XXXIV Addition of Alcohols or Primary Amines to Phosphaalkenes F3CP= C(F)OR . Novel Trifluoromethylphosphanes and Phosphaalkenes

1993 ◽  
Vol 48 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Joseph Grobe ◽  
Duc Le Van ◽  
Gudrun Lange
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Molar Ratio ◽  
Primary Amines ◽  
The Novel ◽  
Experimental Conditions ◽  
Pull System ◽  
Fragment Ions ◽  
New Compounds ◽  
C Nmr

The course of the reactions o f fluorophosphaalkenes F3CP = C (F)OR [R = Me (1), Et (2)] with methanol or ethanol strongly depends on the experimental conditions. Thus at 70 °C a mixture of the 2-phosphapropionic acid ester F3CP (H )CO2R [R = Me (3), Et (4)] and trifluoromethylphosphane H2PCF3 is formed [molar ratio: 3 or 4 /H2 CF3 ≈1/1]. If the precursors F3CP (H )CO2R [R = Me (3), Et) are used as starting materials, the reaction with ROH under the same conditions affords 3 and 4, respectively, (90 to 95% yield) with only traces of H2PCF 3. In the presence o f iPr2NH these precursors react with R′OH to give the novel trifluoromethylphosphaalkenes F3CP = C (OR )OR [R /R′: Me/Me (6); E t/E t (7); Me/Et (8)]. With Et2NH , 3 undergoes an addition/elimination process yielding the interesting push/pull system Et2N(F)C = P-CO2Me (5). 1 and 2 react with primary amines R′NH2 (R′= tBu, Me) with stereoselective formation of the fairly labile phosphaalkenes F3CP = C(OR)NHR′ [R /R′: Me/tBu (9), Et/tBu(10), Me/Me (11)] with trans-positions for CF3 and NHR′.The new compounds 3 -11 were characterized by spectroscopic investigations (1H , 19F, 31P, 13C NMR ; IR, MS) and determination of M+ or typical fragment ions [M+ -OR ] by high resolution mass spectrometry.

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