41 research outputs found
Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties
Full text linkSyntheses, spectroscopy, optical properties, and diastereoselectivity of copper(II)-complexes with chiral aminoalcohol based Schiff bases
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PROTONATION CONSTANTS AND SOLVENT DEPENDENT SPIN-CROSSOVER BEHAVIOUR OF IRON(II)-2-(2′-PYRIDYL)BENZIMIDAZOLE COMPLEXES
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Kinetics and mechanism of the nucleophilic substitution reactions of 2-chloro-1-methylpyridinium iodide with primary and secondary amines
No full text32-36Rate constants for the SN2Ar reactions
of 2-chloro-1-methylpyridinium iodide with MeNH2, EtNH2, PrNH2,
BuNH2, Me2NH and Et2NH in water, at 1mol dm-3
constant ionic strength and 25°C have been determined. The observed rate of reaction
is first order with respect to amine as well as the pyridinium iodide i.e., the
overall reaction is second order. The relative reactiv ity of the amines towards
the reactions is Me2NH >> MeNH2 > EtNH2
> BuNH2 > PrNH2 > Et2NH. The Bronsted
β coefficient
is 0.67 and the Taft's correlation coefficient ρ25* is 4.39 for the primary
amines. Two oppositely charged species seem to be involved in the transition-state
of the substitution reactions. A two-step reaction mechanism is consistent with
the observed results in which the formation of an intermediate is believed to be
the rate determining step
