Published July 2002 | Version v1
Journal article Metadata-only

Ionic strength dependence of formation constants, protonation, and complexation of value with dioxovanadium (V) at different temperatures

Creators

  • 1. Chemistry Dept., Shahid Beheshti Univ., Tehran, Evin (Iran, Islamic Republic of)
  • 2. Chemistry Dept., Islamic Azad Univ., Shahroud (Iran, Islamic Republic of)

Description

The stability constants of the complexes between dioxovanadium(V) ion and L-valine, at various ionic strengths (I= 0.1, 0.3,0.5,0.7, and 1.0 mol dm-3) at 25 deg C, and different temperatures (t= 15,25, 35, and 45 deg C) at I = 0.1 mol dm-3 were determined potentiometrically. The sodium chloride solution was used to maintain the ionic strength. The parameters based on these formation constants were calculated and the dependence of protonation and the stability constants on ionic strength is described by a Debye-Huckel type equation. Estimates were deduced for ΔH deg and ΔS deg values from temperature dependence of stability constants

Abstract (Russian)

Методом потенциометрии определены константы устойчивости комплексов диоксованадия (V) с L-валином при различных значениях ионной силы (I= 0.1, 0.3,0.5,0.7 и 1.0 моль/л) при 25 град С и различных температурах (t= 15,25, 35 и 45 град С) при I = 0.1 моль/л. Для поддержания ионной силы использовался раствор хлорида натрия. С помощью расширенного уравнения Дебая-Хюккеля описана зависимость констант протонирования и устойчивости от ионной силы, на основе полученных констант образования рассчитаны соответствующие параметры. Из температурной зависимости констант устойчивости оценены значения энтальпии (ΔH град) и энтропии (ΔS град)

Additional details

Publishing Information

Journal Title
Zhurnal Neorganicheskoj Khimii
Journal Volume
47
Journal Issue
7
Journal Page Range
p. 1211-1214
ISSN
0044-457X
CODEN
ZNOKAQ

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
35008448
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
AQUEOUS SOLUTIONS; CHEMICAL COMPOSITION; CHEMICAL PREPARATION; CONCENTRATION RATIO; ENTHALPY; ENTROPY; SODIUM CHLORIDES; STABILITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; VALINE; VANADIUM COMPLEXES
Descriptors DEC
ALKALI METAL COMPOUNDS; AMINO ACIDS; CARBOXYLIC ACIDS; CHLORIDES; CHLORINE COMPOUNDS; COMPLEXES; DISPERSIONS; HALIDES; HALOGEN COMPOUNDS; HOMOGENEOUS MIXTURES; MIXTURES; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; SODIUM COMPOUNDS; SOLUTIONS; SYNTHESIS; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPLEXES

Optional Information

Notes
13 refs., 1 fig., 4 tabs.