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  1. No Access

    Article

    Comparative study of the catalytic effect of Ag(I) and Hg(II) on the exchange of cyanide by 4-cyanopyridine in hexacyanoferrate(II): a kinetic approach

    The kinetic effect of catalytic activities of Ag(I) and Hg(II) was subjected to compare spectrophotometrically in homogeneous medium. The exchange of cyanide by 4-cyanopyridine (4-CNpy) in hexacyanoferrate(II)...

    Radhey M. Naik, Abhas Asthana… in Journal of the Iranian Chemical Society (2015)

  2. No Access

    Article

    Kinetic and mechanistic study of the mercury(II)-catalyzed substitution of cyanide in hexacyanoruthenate(II) by pyrazine

    The kinetics of mercury(II)-catalyzed substitution of cyanide ligand in hexacyanoruthenate(II) by pyrazine (Pz) has been investigated spectrophotometrically at 370 nm in aqueous medium. The reaction exhibits f...

    Radhey M. Naik, Amit K. Verma, Abhinav Agarwal, Abhas Asthana in Transition Metal Chemistry (2009)

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    Article

    Kinetic determination of silver at trace level based on its catalytic effect on a ligand substitution reaction

    It is observed that Ag(I) catalyzes the rate of substitution of phenylhydrazine (PhNHNH2) into hexacyanoferrate(II), producing a cherry red colored complex, [Fe(CN)5PhNHNH2]3−. The reaction was monitored at 488 n...

    Radhey M. Naik, Raj K. Tiwari, Pradeep K. Singh… in Transition Metal Chemistry (2008)

  4. No Access

    Article

    The Mercury(II) Catalyzed Ligand Exchange Between Hexacyanoferrate(II) and Pyrazine in Aqueous Medium

    The kinetic and mechanistic studies of HgII catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by pyrazine (Pz) were monitored by following the appearance of the yellow complex [Fe(CN)5Pz]3− at 440...

    Radhey M. Naik, Raj K. Tewari, Pradeep K. Singh… in Transition Metal Chemistry (2005)

  5. No Access

    Article

    Kinetics and mechanism of ligand substitution of mono(polyamine)-nickel(II) complexes with 4-(2-pyridylazo)resorcinol

    The kinetics and mechanism of ligand substitution reactions of tetraethylenepentamine nickel(II), Ni (Teren), and triethylenetetraamine nickel(II), Ni(Trien), with 4-(2-pyridylazo)resorcinol (parH2) have been stu...

    Hari C. Bajaj, Surendra Prasad, Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1991)

  6. No Access

    Article

    An independent kinetic and mechanistic study of the secondary reactions in the substitution of [FeL(OH)](n−2)− (L= triethylenetetraaminehexaacetic acid) by cyanide ions

    The kinetics of reaction between [Fe(CN)5OH]3− and CN− have been investigated spectrophotometrically at pH=11.00, I=0.25 M(NaClO4) and temp.=25.0°C by disappearance of the absorption peak at 395 nm. The rate data...

    Surendra Prasad, Prem C. Nigam, Radhey M. Naik in Transition Metal Chemistry (1990)

  7. No Access

    Article

    The kinetics and mechanism of reaction between ethylenediaminetetraacetomanganate(III) and cyanide ion

    The title reaction has been followed spectrophotometrically at 325 nm (λmax of [Mn(CN)6]3−) under pseudo-first order conditions with cyanide in a large excess at pH=10.0, I=0.1M (NaClO4) and 25°C. The reaction fo...

    P. Mishra, Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1988)

  8. No Access

    Article

    Kinetic and mechanism of pentacyanohydroxoferrate(III) formation from the reaction of [Fe2HPDTA(OH)2] with cyanide ions

    The kinetics and mechanism of exchange of HPDTA in [Fe2HPDTA(OH)2] with cyanide ion (HPDTA=2-hydroxytrimethylenediaminetetraacetic acid) was investigated spectrophotometrically by monitoring the peak at 395 nm (λ

    Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1987)

  9. No Access

    Article

    Kinetics and mechanism of pentacyanohydroxoferrate(III) formation from the reaction of cyanide ion with [Fe2L(OH)2]2− (L=triethylenetetraaminehexaacetate)

    The kinetics and mechanism of the reaction between [Fe2L(OH)2]2− and cyanide ion (L = TTHA, triethylenetetraaminehexaacetate) have been studied spectrophotometrically atpH=11.0±0.1,I=0.1 M(NaClO4) and T = 25±0.1 ...

    Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1986)

  10. No Access

    Article

    Kinetics and mechanism of ligand substitution reactions of NiL and Ni2L with cyanide ion (L = hexamethylenediaminetetraacetic acid)

    The kinetics and mechanism of reactions of cyanide ion with [NiL] and [Ni2L] (L = hexamethylenediaminetetraacetic acid) have been studied spectrophotometrically at 25 ±0.1 °C, with pH=11.0±0.02, and I=0.1 M(NaClO

    Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1986)

  11. No Access

    Article

    Linear free energy relationships and kinetics of ligand substitutions: Correlations of rate constants with overall stability constants of reactive intermediate species in the stepwise formation of pentacyanohydroxoferrate(III) from monohydroxoaminocarboxylato iron(III) complexes

    A linear free energy relationship has been proposed between stepwise rate constants and the overall stability constants of the intermediates of the type FeL(OH)(CN)x (where x=0, 1, 2 and 3) formed in the five ste...

    Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1985)

  12. No Access

    Article

    Kinetics and mechanism of pentacyanohydroxoferrate(III) formation from mono(aminocarboxylato)iron(III) complexes

    The kinetics and mechanism of the system: [FeL(OH)]2−n + 5 CN− ⇌ [Fe(CN)5(OH)]3− + Ln−, where L=DTPA or HEDTA, have been investigated at pH= 10.5±0.2, I=0.25 M and t=25±0.1 ‡C.

    Radhey M. Naik, Prem C. Nigam in Transition Metal Chemistry (1985)