Synthesis and Spectroscopic Characterisation of Some Neutral Tetracoordinated Germanium (IV) Alkoxyalkanolates

2003 ◽  
Vol 2003 (9) ◽  
pp. 567-569 ◽  
Author(s):  
Madhvesh Pathak ◽  
Rakesh Bohra ◽  
Ram C. Mehrotra
Keyword(s):  
Anhydrous Benzene ◽  
Germanium Atom ◽  
Spectral Studies ◽  
Tetrahedral Geometry ◽  
Reduced Pressure ◽  
High Yields ◽  
Spectroscopic Characterisation

Compounds of the type, [Ge(OPri)4-n(OCH2CH2OR)n], (where R = Me, Et, n-Bu and n = 1-4) have been synthesised in high yields by the interactions of germanium tetraisopropoxide with alkoxyalkanols (HOCH2CH2OR) in different stoichiometries in refluxing anhydrous benzene, and are monomeric in refluxing benzene. All these compounds can be purified by distillation under reduced pressure. IR and NMR (1H and 13C) spectral studies indicate a tetrahedral geometry around the germanium atom.

Alkoxyalkanol Modified Ti(OCHMe2)4: Synthesis and Characterization of Novel [(OPri)4-nTi (OC2H4OR)n]

2012 ◽  
Vol 584 ◽  
pp. 415-419 ◽  
Author(s):  
Madhvesh Pathak ◽  
Blassan Samuel ◽  
Kiran Tummalapalli ◽  
Prasanth Vuppalapati Giri ◽  
Sivasankar Koppala ◽  
...  
Keyword(s):  
Titanium Atom ◽  
Spectral Studies ◽  
Synthesis And Characterization ◽  
Titanium Tetraisopropoxide ◽  
Tetrahedral Geometry ◽  
Reduced Pressure ◽  
Structural Arrangements

Novel structural arrangements for alkoxyalkanol modified titanium tetraisopropoxide [(Ti(OPri)4, TPT] were obtained from stoichiometric reactions between TPT and alkoxyalkanols {HOCH2CH2OR,where R= Me, Et}. All the 1:1, 1:2, 1:3 and 1:4 reactions in refluxing benzene form mononuclear species [(OPri)4-nTi(OC2H4OR)n]. All these compounds can be purified by distillation under reduced pressure. On the basis of IR and NMR (1H &13C) spectral studies all the mononuclear derivatives have been obtained in tetrahedral geometry around titanium atom.

PRODUCTION AND PROPERTIES OF 2,3-BUTANEDIOL: XXXI. PILOT PLANT STUDIES ON THE FERMENTATION OF WHEAT BY AEROBACILLUS POLYMYXA

1949 ◽  
Vol 27f (4) ◽  
pp. 199-210 ◽  
Author(s):  
A. C. Blackwood ◽  
F. J. Simpson ◽  
J. A. Wheat ◽  
J. D. Leslie ◽  
G. A. Ledingham
Keyword(s):  
Calcium Carbonate ◽  
Pilot Plant ◽  
Reduced Pressure ◽  
Fermentation Efficiency ◽  
Whole Wheat ◽  
High Yields

In this paper are described the construction and operation of a pilot plant in which whole wheat mashes were successfully fermented by Aerobacillus polymyxa. A yield of 8.9 lb. of levo-2,3-butanedio1 and 5.9 lb. of ethanol per bushel of wheat was obtained, which is a fermentation efficiency of 90%. The best fermentations were obtained at 32 °C. using a 15% mash buffered with calcium carbonate. Agitation increased the fermentation efficiency at 96 hr. but decreased the diol-to-ethanol ratio. Reduced pressure did not change the efficiency but markedly reduced the ratio of diol to ethanol. Aeration had little effect. The presence of contamination organisms was highly detrimental and it was necessary to sterilize the mash, vessels, and piping. Although a backstocking technique could be practised in the preparation of inoculum, frequent recourse to stock cultures or improved strains was found advisable for maintenance of high yields.

Preparation and Spectroscopic Characterisation of a Series of Heterobimetallic N-phenyldiethanolaminate-alkoxide Derivatives of Oxovanadium(V)

2005 ◽  
Vol 2005 (6) ◽  
pp. 352-355 ◽  
Author(s):  
Rajendra Singh Ghadwal ◽  
Ram C. Mehrotra ◽  
Anirudh Singh
Keyword(s):  
Molecular Weight ◽  
Spectral Studies ◽  
Metal Alkoxides ◽  
Nmr Studies ◽  
Mass Spectral ◽  
Elemental Analyses ◽  
Derivatives Of ◽  
Spectroscopic Characterisation

Reaction of VO(OPri)3 with two equivalents of N-phenyldiethanolamine (PhDEAH2) yields a homometallic complex [VO(PhDEA)(PhDEAH)] 1, which reacts with a number of metal alkoxides to afford heterobimetallic oxovanadium(V) complexes of the types [VO(PhDEA)2{M(OR)n-1}] [where PhDEA = C6H5N(CH2CH2O–)2], [M =: Al (n = 3, R = Pri) 2; Al (n = 3, R = But) 3; Ti (n = 4, R = Pri) 4; Zr (n = 4, R = Pri) 5; Nb (n = 5, R = Pri) 6; Ta (n = 5, R = Pri) 7. The derivative [VO(PhDEA)(OSiPh3)] 8 has been prepared by the equimolar interaction of [VO(PhDEA)(OPri)] with Ph3SiOH. All of these complexes have been characterised by spectroscopic (IR; 1H, 13C, 27Al and 51V NMR) studies, elemental analyses, and molecular weight measurements. The derivative 2 has also been characterised by FAB mass spectral studies, which supports for its monomeric nature.

scholarly journals Studies on Inclusion Complexes of β-Cyclodextrin with Some Metal Complexes of Isatinylsemicarbazone and Isatinylthiosemicarbazone

2020 ◽  
Vol 32 (12) ◽  
pp. 3197-3202
Author(s):  
Rajeev Kumar ◽  
Sanjay Kumar ◽  
Madhu Bala
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Complexes ◽  
Inclusion Complexes ◽  
Analytical Data ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Tetrahedral Geometry ◽  
Solid States ◽  
Spectral Bands ◽  
Infrared Spectral

The complexes of Co(II), Ni(II), Zn(II) and Cd(II) with isatinylsemicarbazone (IstscabH) and isatinylthiosemicarbazone (IsttscabH) of composition ML2·2H2O [M = Co(II) or Ni(II) and LH = IstscabH or IsttscabH] and ML2 [M = Zn(II) or Cd(II) and LH = IstscabH or IsttscabH] have been synthesized and their antibacterial activity has been investigated. Their inclusion complexes with β-cyclodextrin (β-CD) having composition [ML2(β-CD)·2H2O] or M(C60H88N8O39S2)], [M = Co(II) or Ni(II) and LH = IstscabH or IsttscabH] and [ML2(β-CD) or M(C60H84N6O-37S2)], [M = Zn(II) or Cd(II) and LH = IstscabH or IsttscabH] have also been isolated in solid states. All the synthesized metal complexes have been characterized by analytical data, molar conductance, magnetic susceptibility, electronic and infrared spectral studies. The tetrahedral geometry for Zn(II) and Cd(II) and octahederal geometry for Co(II) and Ni(II) have been assigned on the basis of magnetic susceptibility, UV electronic transitions and IR spectral bands assignments. The structures are retained in inclusion products. A biological activity of Schiff bases, their metal complexes and inclusion products for bacteria Escherichia. coli, Bacillus subtilis and Staphylococcus aureus have been screened and activity explained.

Grinding Synthesis of Pyrazolyl-Bis Coumarinyl Methanes Using Potassium 2-Oxoimidazolidine-1,3-diide

2019 ◽  
Vol 16 (2) ◽  
pp. 303-308 ◽  
Author(s):  
Kazem Hematinezhad ◽  
Mohammad Nikpassand ◽  
Leila Zare Fekri
Keyword(s):  
Reaction Time ◽  
Room Temperature ◽  
Aqueous Media ◽  
13C Nmr Spectroscopy ◽  
Reusable Catalyst ◽  
Reduced Pressure ◽  
Elemental Analyses ◽  
Nucleophilic Addition Reaction ◽  
High Yields ◽  
Work Up

Aim and Objective: Potassium 2-oxoimidazolidine-1,3-diide (POImD) as a novel and reusable catalyst was used for the synthesis of pyrazolyl-bis coumarinyl methanes by a nucleophilic addition reaction of synthetized pyrazolecarbaldehyde and two equivalents of 4-hydroxycoumarin under grinding. The catalyst can be reused and recovered several times without loss of activity. This method provides several advantages such as eco-friendliness, simple work-up and shorter reaction time as well as excellent yields. All of the synthesized compounds were characterized by IR, 1H and 13C NMR spectroscopy and elemental analyses. Material and Method: Synthetized pyrazole carbaldehyde 1a (1 mmol), 4-hydroxycoumarin 2 (2 mmol), 1 mmol of POImD and 10mL of H2O were ground in a mortar by a pestle for 30-90 minutes. After the completion of the reaction, as monitored by TLC on silica gel using ethyl acetate/n-hexane (1:2), the mixture was allowed to cool to room temperature. After completion of the reaction, we extracted the product with CH2Cl2/H2O. This was followed by separation of phases, evaporation of the organic phase and recrystallization of the residue with 50 mL of ethanol/H2O (1:1). The pure product was then obtained in 87 to 96% yield. The aqueous phase was concentrated under reduced pressure to recover the catalyst for subsequent use. Results: To continue our ongoing studies to synthesize heterocyclic and pharmaceutical compounds by mild, facile and efficient protocols, herein we wish to report our experimental results on the synthesis of pyrazolylbis coumarinyl methanes, using various synthetized pyrazole carbaldehydes and 4-hydroxycoumarin in the presence of POImD in aqueous media at room temperature. Conclusion: Finally, we developed an efficient, fast and convenient procedure for the three-component synthesis of pyrazolyl-bis coumarinyl methanes through the reaction of pyrazole carbaldehydes and 4- hydroxycoumarin, using POImD as a novel and reusable catalyst. The remarkable advantage offered by this method is that the catalyst is non-toxic, inexpensive, easy to handle and reusable. A short reaction time, simple work-up procedure, high yields of product with better purity and the green aspect by avoiding a hazardous solvent and a toxic catalyst are the other advantages. To the best of our knowledge, this is the first report on the synthesis of pyrazolyl-bis coumarinylmethane derivatives using potassium 2-oxoimidazolidine-1,3-diide (POImD).

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 Cu(II), Ni(II), and Zn(II) Complexes of Salan-Type Ligand Containing Ester Groups: Synthesis, Characterization, Electrochemical Properties, andIn VitroBiological Activities

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
P. Jeslin Kanaga Inba ◽  
B. Annaraj ◽  
S. Thalamuthu ◽  
M. A. Neelakantan
Keyword(s):  
Cyclic Voltammetry ◽  
Magnetic Moments ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Binding Modes ◽  
Tetrahedral Geometry ◽  
Mass Spectral ◽  
Displacement Assay ◽  
Voltammetry Methods

A salen ligand on reduction and N-alkylation affords a novel [N2O2] chelating ligand containing ester groups [L = diethyl-2,2′-(propane-1,3-diylbis((2-hydroxy-3-methoxy benzyl)azanediyl))diacetate]. The purity of the ligand was confirmed by NMR and HPLC chromatograms. Its Cu(II), Ni(II), and Zn(II) complexes were synthesized and characterized by a combination of elemental analysis, IR, NMR, UV-Vis, and mass spectral data, and thermogravimetric analysis (TG/DTA). The magnetic moments, UV-Vis, and EPR spectral studies support square planar geometry around the Cu(II) and Ni(II) ions. A tetrahedral geometry is observed in four-coordinate zinc with bulky N-alkylated salan ligand. The redox properties of the copper complex were examined in DMSO by cyclic voltammetry. The voltammograms show quasireversible process. The interaction of metal complexes with CT DNA was investigated by UV-Vis absorption titration, ethidium bromide displacement assay, cyclic voltammetry methods, and agarose gel electrophoresis. The apparent binding constant values suggest moderate intercalative binding modes between the complexes and DNA. Thein vitroantioxidant and antimicrobial potentials of the synthesized compounds were also determined.

scholarly journals Synthesis, Characterization and Antifungal Activity of Novel Quinazolin-4-one Derivatives Containing 8-Hydroxyquinazoline Ligand and its Various Metal Complexes

2009 ◽  
Vol 6 (s1) ◽  
pp. S445-S451
Author(s):  
R. T. Vashi ◽  
S. B. Patel
Keyword(s):  
Antifungal Activity ◽  
Elemental Analysis ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Distorted Octahedral Geometry ◽  
Hydroxyl Groups ◽  
Tetrahedral Geometry ◽  
Distorted Octahedral ◽  
Metal Ligand ◽  
Methyl Phenyl

Novel ligands containing quinazoline-4-one-8-hydroxyquinoline (QQ) merged moieties were prepared and characterized. For this anthranilic acid and 5-bromoanthranilic acid were converted respectively into 2-chloromethyl–3-(4-methyl phenyl)-3(H)-quinazoline-4-one and 2-chloromethyl–3-(methyl phenyl)-6-bromo-3(H)-quinazoline-4-one. Both these compounds were condensed with 5-amino-8-hydroxyquinoline. The so called resulted compounds were named respectively as 2-[(8-hydroxy-quinolinyl) –5- amino methyl] -3-(4-methylphenyl)- 3(H)- quinazoline -4- one and 2-[(8-hydroxyquinolinyl)-5-aminomethyl] -3(methyl phenyl)-6-bromo-3(H)-quinazoline-4-one. Both the compounds were designated respectively as HL1and HL2ligands. The transition metal (Cu2+, Ni2+, Zn2+, Mn2+and Co2+) complexes of both these ligands were prepared. The ligands and their complexes as case may be were characterized by elemental analysis, spectral studies and number of hydroxyl groups. The stoichiometry of the complexes has been found to be 1:2 (metal: ligand). An octahedral geometry around Co2+, Ni2+and Mn2+, distorted octahedral geometry around Cu2+and tetrahedral geometry of around Zn2+have been proposed. These complexes also been tested for their antifungal activities.

scholarly journals Synthesis, Thermal Characterization and in vitro Antibacterial Assessment of Co(II) and Cd(II) Complexes of Schiff Base Derived from Amoxicillin and Thiophene-2-carbaldehyde

2019 ◽  
Vol 31 (4) ◽  
pp. 951-959 ◽  
Author(s):  
N.K. Chaudhary ◽  
B. Guragain
Keyword(s):  
Metal Complexes ◽  
Biological Activities ◽  
Geometry Optimization ◽  
Thermal Characterization ◽  
Molar Conductance ◽  
Sem Analysis ◽  
Biological Data ◽  
Spectral Studies ◽  
Tetrahedral Geometry

A novel AMXTC2 ligand was prepared by simultaneous stirring and refluxing of an equimolar mixture of amoxicillin and thiophene-2-carbaldehyde in methanol and was further used to synthesize metal complexes by metalation with cobalt and cadmium salts, taking ligand metal ratio 2:1. They were characterized by elemental microanalysis, FT-IR, mass, UV-visible, 1H NMR, thermal analysis, magnetic moment and molar conductance measurements. The coordination sites in the ligand were verified by their comparative and extensive spectral studies. The detailed exploration of the data suggested octahedral geometry for Co-AMXTC2 and tetrahedral geometry for Cd-AMXTC2 complexes. The thermodynamic and kinetic parameters such as E*, ΔH*, ΔS* and ΔG* of various decomposition steps were calculated from TGA curves using the Coats-Redfern method. The molar conductivity data suggested non-electrolytic nature of the complexes. SEM analysis was done to observe their surface morphology. The geometry optimization of the proposed molecular structure of the complexes was achieved by running MM2 calculation in Gaussian supported Cs-ChemOffice Ultra-11 program software. The biological activities had been evaluated in vitro against E. coli, K. pneumonia, P. vulgaris and S. aureus pathogens in order to assess their antibacterial potency. The biological data revealed better growth inhibitory action of the ligand and metal complexes with bacterial pathogens.

scholarly journals Transition metal M(II) complexes with isonicotinoylhydrazone-9-anthraldehyde

2010 ◽  
Vol 75 (11) ◽  
pp. 1515-1531 ◽  
Author(s):  
M.L. Dianu ◽  
A. Kriza ◽  
N. Stanica ◽  
A.M. Musuc
Keyword(s):  
Thermal Analyses ◽  
Thermal Studies ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Physico Chemical ◽  
Pyridine Nitrogen ◽  
Infrared Spectral ◽  
Nitrate Complexes

New complexes of isonicotinoylhydrazone-9-anthraldehyde with Cu(II), Co(II) and Ni(II) have been prepared and characterized by analytical and physico-chemical techniques, such as elemental and thermal analyses, magnetic susceptibility and conductivity measurements, and electronic, EPR and IR spectral studies. The infrared spectral studies revealed the bidentate or monodentate nature of the Schiff base in the complexes; the pyridine nitrogen does not participate in the coordination. A tetrahedral geometry is suggested for the nitrate-complexes and an octahedral geometry for the others. Thermal studies support the chemical formulation of these complexes.

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