Published December 2002 | Version v1
Journal article Metadata-only

Dielectric constant dependence of formation constants: complexation of dioxovanadium(V) with methionine

Creators

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

Description

The reaction of dioxovanadium(V) with methionine was studied by spectrophotometric titration in mixed solvent systems of methanol + water and dioxane + water at 25 Deg C and constant ionic strength 0.15 mol dm-3 NaClO4 in the pH range 1.5 - 8, with high ligand of metal ratios. Two mononuclear complexes ML and ML2 have been characterized for the ligands. The stability constants of the complexes formed and their stoichiometry are given and interpreted. Linear relationships are observed when log β is plotted versus 1/D, where β and D represent formation and dielectric constants, respectively. The results are discussed in terms of the effect of solvent protonation and complexation

Abstract (Russian)

Методом спектрофотометрического титрования изучена реакция иона диоксованадия(V) с метионином (L) в системах смешанных растворителей метанол + вода и диоксан + вода при 25 град С и постоянной ионной силе 0.15 мол/л NaClO4, в интервале рН 1.5 - 8 и при больших соотношениях лиганд:металл. Установлено, что в системе образуется два типа моноядерных комплексов ML и ML2, для которых определены константы устойчивости и стехиометрия. Обнаружена линейная зависимость между величинами log β и 1/D, где β представляет собой константу образования, а D - диэлектрическую постоянную. Полученные результаты обсуждаются с точки зрения влияния растворителя на процессы протонирования и комплексообразования

Additional details

Publishing Information

Journal Title
Zhurnal Neorganicheskoj Khimii
Journal Volume
47
Journal Issue
12
Journal Page Range
p. 2091-2095
ISSN
0044-457X
CODEN
ZNOKAQ

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
35049807
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
AQUEOUS SOLUTIONS; CHEMICAL REACTIONS; CONCENTRATION RATIO; COORDINATION VALENCES; DIOXANE; METHANOL; METHIONINE; MIXED SOLVENTS; PERMITTIVITY; PH VALUE; STABILITY; VANADIUM COMPLEXES
Descriptors DEC
ALCOHOLS; AMINO ACIDS; CARBOXYLIC ACIDS; COMPLEXES; DIELECTRIC PROPERTIES; DISPERSIONS; DRUGS; ELECTRICAL PROPERTIES; HETEROCYCLIC COMPOUNDS; HOMOGENEOUS MIXTURES; HYDROXY COMPOUNDS; LIPOTROPIC FACTORS; MIXTURES; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; PHYSICAL PROPERTIES; SOLUTIONS; SOLVENTS; TRANSITION ELEMENT COMPLEXES; VALENCE

Optional Information

Notes
26 refs., 3 figs., 2 tabs.