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Showing 1 to 19 of 19 for “"STRETCHING FREQUENCIES"”.
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A computational study of supported rhodium catalysts
… to obtainminimum-energy structures and harmonic stretching frequencies of RhI(CO)2/-Al2O3 species. The computed bond lengths and harmonic stretching frequencies were in good agreement with the experimental evidence and with the results obtained using periodic models
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SPECTROSCOPIC CHARACTERIZATIONS OF THE COMPOUND II INTERMEDIATE OF SOYBEAN PEROXIDASE FROM SOYBEAN SEED COATINGS
… spectra from 900 to 500cm-1 where the FeIV=O stretching frequencies for heme compound II intermediates are expected. Several pH and pD (deuterium substitution) samples of the soybean peroxidase were analyzed using resonance Raman spectroscopy. The vibrational stretching frequencies of the …
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The N-H stretching frequency of substituted hydrazines
… & R' are either alkyl or aryl groups) on the N-H stretching and bending frequencies of substituted hydrazines. In this project an investigation was undertaken to correlate the N-H stretching and bending frequencies of 1, 1-disubstituted hydrazines. The difference between Vs and Vas was also …
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The effects of metal ion and ligand substitution on the spectroscopic properties of metal complexes.
Metal-nitrogen stretching vibrations in Co(II), Ni(II), Cu(II) and Zn(II) chloride 4-methylaniline complexes are assigned by ¹⁵N-labelling in conjunction with a consideration of the relative crystal field stabilizition energies of the metal ions. Bands in the ultraviolet electronic spectra of …
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ΦΑΣΜΑΤΟΣΚΟΠΙΚΗ ΚΑΙ ΗΛΕΚΤΡΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΕΝΩΣΕΩΝ ΣΥΝΑΡΜΟΓΗΣ ΤΟΥ ΚΟΒΑΛΤΙΟΥ (ΙΙΙ) ΚΑΙ ΧΑΛΚΟΥ (ΙΙ) ΜΕ Β-ΔΙΟΝΕΣ
… INNATURE. FOR BOTH SERIES IT WAS FOUND THAT THE STRETCHING FREQUENCIES AS WELL AS THE POLAROGRAPHIC REDUCTION POTENTIALS ARE LINEARELY DEPENDENT ON HAMMETT Σ FUNCTIONS. IN THE CASE OF CO(III) CHELATES SIMILARLY DEPENDENT ARE THE RACAH PARAMETER B AND THE ENERGY OF THE FRONTIER MOLECULAR ORBITALS. …
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Raman studies of thin polypyrrole films
… resonance Raman spectra of the carbon-carbon stretching frequencies. The position of these bands is a function of the number of double bonds in conjugation. The conjugation length within the polymer chain was found to be between 3 and 4 rings for PP and slightly less in PNMP (2-3 rings). This …
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The investigation of some novel polysiloxane liquid crystal systems.
… us to determine the peak ratios of Si-H/CN stretching frequencies on deformation. Small enhancements, approx 7%, of LC order parallel to the direction of stretching were observed. In addition, a novel 'ring' elastomer incorporating liquid crystal units has been produced. Cyclic materials …
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A matrix isolation study of transition metal halides and their structure.
… spectra. Due to the similarity of the calculated stretching frequencies of PdF2, PdF3, PdF4, and PdF6 the assignment was challenging and so identification of these bands was conducted based photolysis and annealing behaviour in conjunction with computational calculations. This has allowed for the …
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Palladium and platinum complexes of trans-coordinating bidentate phosphine ligands
… by the far infrared studies of the (M-.X) stretching frequencies. The perchlorate complexes of palladium (II) and platinum (II) prepared analysed for [M(L) 2 (clo4 ) 2 ]. From infrared studies and, conductance measurements it was concluded that the complexes were 2:1 electrolytes of the …
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Building a Better Model for the Molybdenum Cofactor: A New Class of Molybdenum Dithiolene Complexes
… during CV experiments, and shifts to higher Mo=O stretching frequencies in IR. Proton and carbon NMR were used to structurally characterize the complexes where possible, and X-ray crystallography confirmed not only the placement of the atoms in the Tp*Mo(O)(pyrrolo-S2BMOQO)complex, but revealed …
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Medicinal nitro compounds
… in Chapter II. The asymmetric and symmetric stretching frequencies of the nitro group in a range of derivatives have been accurately recorded, and the influences of substitution, resonance effects,hydrogen-bonding, dipole moment and solvents examined. The infrared spectra of substituted …
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The adsorption of molecular oxygen on Au/Ni(111) alloys and its oxidation of CO at 85 K
… oxygen adsorbates are characterized by their 0-0 stretching frequencies of 740 cm', 851 cm' and 962 cm', as measured by high resolution electron energy loss spectroscopy (HREELS). The concentrations and frequencies of these species are determined as a function of Au coverage. The concentrations …
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Oxovanadium(IV) and (V) complexes with naturally-occurring molecules
… complexes. Comparison of the infrared stretching frequencies of the vanadium-oxo bond revealed that the strength of the vanadium-oxo bond in the eight complexes was consistent with bond strength observed in other oxovanadium complexes. Single crystal X-ray diffraction studies of VO(0z)2 …
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Relationships between crystal structure, bonding and thermal stability of amphiboles
… exist between thermal stability and OH-stretching frequency for different amphibole end-members at different temperatures. For epidote minerals, as well as for muscovite and phlogopite, high OH-stretching frequencies also correlated with the minerals having higher thermal stability. …
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Gold(II) fluorosulfate derivatives and new gold(I) and platinum(II) carbonyl complexes
… [Au(C0)2][Sb2F11] has a very high average C-0 stretching frequency of 2235.5 cm-1, suggesting that CO is behaving primarily as a a donor, and ir-backbonding is greatly reduced. The Au-C bond is consequently weak, and reaction of a donor solvent such as acetonitrile with [Au(C0)2][Sb2F1i] …
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Transition metal complexes of bis(diphenylphosphino)methane, dithizone and dithiolenes: structural, spectroscopic, electrochemical and computational studies
… potentials and 31P NMR data or carbonyl stretching frequencies of the Group 6 mercurated complexes show that the mercury atom does facilitate the flow of electrons through the four-membered chelate ring. However, this effect has been established to be weak. Similar weak electronic effects …
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Metal(ii) schiff base complexes and the insulin-mimetic Studies on the oxovanadium(iv) complexes
… tetradentate ligands. The observed shifts in the stretching frequencies of (C=N) and (C¯O) are indicative of the formation of these complexes. Further conclusive evidence of the coordination of these Schiff-bases with the metal ions was shown by the appearance of new bands due to (M¯N) and …
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Small molecule binding to electrophilic trigonal pyramidal platinum, palladium, and nickel
… nickel(II) centers. The extremely high stretching frequencies of these bound N₂ moieties attest to their minimal activation, and the stability of these complexes is shown to arise from increased adonation from the N₂ to the cationic nickel center, which compensates for the relative lack …