NOPR Collection:

Experimental studies on the complex oscillatory behaviour in gallic acid – BrO₃^-Mn²⁺- H₂SO₄

Wed, 01 Oct 1997 00:00:00 GMT

Title: Experimental studies on the complex oscillatory behaviour in gallic acid – BrO₃^-Mn²⁺- H₂SO₄ Authors: Li, Hexing Abstract: The title system has been studied in the batch reactor and its state followed by the bromide electrode potentials and UV spectroscopy. The system exhibits complex oscillatory behaviour including sequential oscillations. aperiodic oscillations and even the more complex oscillating states. On the basis of the analysis of the reaction products. the oscillations involving the following systems have been distinguished: (a) uncatalvzcd oscillations in gallic acid (GA)-BrO₃ –H₂SO₄, system. (b) Mn²⁺ -catalyzcd oscillations in gallic acid (GA)-BrO₃ –H₂SO₄ system. (c) Mn²⁺-catalyzed oscillations in monobromogallic acid(BrGA)-BrO₃ –H₂SO₄ system. The inhibition and combination between these oscillations result in the complex oscillatory pattern observedm the present system. The oscillating mechanism has been discussed on the basis of FKN mechanism and OKN mechanism. Page(s): 823-828

Switching response of conducting poly(o-toluidine) in protonic electrolytes

Wed, 01 Oct 1997 00:00:00 GMT

Title: Switching response of conducting poly(o-toluidine) in protonic electrolytes Authors: Koul, S.; Dhawan, S.K.; Malhotra, B.D.; Chandra, S.; Kumar, D; Sharma, R.C.; Chandra, R. Abstract: Poly(o-toluidine) film shows multiple optical transitions (yellow ®green ®blue®violet) depending on the oxidation state of the polymer controlled by varying the potentials in the range from -0.3 V to 1.0 volts versus Ag/AgCl. The presence of methyl group affects not only the polymerization reaction but also the potential window suitable for designing electrochromic devices. A repetitive switching test to estimate the cycle life of the polymer film Indicates stable electrochromic behaviour upto > 10⁵ cycles, provided the upper potential limit does not exceed 0.55 volts. Page(s): 829-833

Partial molar volume, ultrasonic and viscometric studies of glycine, α-alanine and β-alanine in water + DMSO mixtures at different temperatures.

Wed, 01 Oct 1997 00:00:00 GMT

Title: Partial molar volume, ultrasonic and viscometric studies of glycine, α-alanine and β-alanine in water + DMSO mixtures at different temperatures. Authors: Dash, U. N.; Pasupalak, N. N. Abstract: Studies of apparent molar volume, sound velocity and viscosity have been made in the solutions of glycine, a-alanine and b-alanine in water + DMSO mixtures (X_DMSO = 0.10, 0.15 and 0.20) at 298.15, 303.15, 308.15 and 313.15 K to evaluate apparent molar properties and various acoustic parameters along with solvation numbers, relative viscosity coefficients, relaxation time, relative association and related thermodynamic parameters. The results are discussed in the light of ion-ion and ion-solvent interactions and of structural effects of the solvent in solution. Page(s): 834-843

Mononuclear manganese(IV) complexes: Deprotonated amide coordination via oxygen centre

Wed, 01 Oct 1997 00:00:00 GMT

Title: Mononuclear manganese(IV) complexes: Deprotonated amide coordination via oxygen centre Authors: Lakshmi, A V; Sangeetha, N R; Pal, S Abstract: Syntheses and properties of a series of mononuclear manganese (lV) complexes with N-benzoyl-N'-salicylidenehydrazine and its substituted derivatives as ligands are reported. The dianionic planar Jigands bind the metal ion meridionally through phenolate-O, irnine-N and deprotonated amide-O atoms. EPR spectra of the complexes are characteristic of an axial MnO₄N₂ coordination sphere. Electronic spectral features and the metal centred redox potentials are significantly influenced by the electronic nature of the substituents on the ligands. Page(s): 844-848

NOPR Collection:

Experimental studies on the complex oscillatory behaviour in gallic acid – BrO3 - Mn2+- H2SO4

Switching response of conducting poly(o-toluidine) in protonic electrolytes

Partial molar volume, ultrasonic and viscometric studies of glycine, α-alanine and β-alanine in water + DMSO mixtures at different temperatures.

Mononuclear manganese(IV) complexes: Deprotonated amide coordination via oxygen centre

Experimental studies on the complex oscillatory behaviour in gallic acid – BrO₃^-Mn²⁺- H₂SO₄