Trend of Stabilities of Adducts of 4, 4, 4-Trifluoro-1-(2-thienyl)-1, 3- butanedionates with Phenylpyridines over Lanthanoid Series

Yuko HASEGAWA; Shoichi HIROSE; Junko YAMANAKA

doi:10.2116/analsci.11.59

Yuko HASEGAWA, Shoichi HIROSE, Junko YAMANAKA

Author information

Keywords: Adduct formation, phenylpyridines, lanthanoids(III), solvent extraction, rare earth complexation

JOURNAL FREE ACCESS

1995 Volume 11 Issue 1 Pages 59-62

DOI https://doi.org/10.2116/analsci.11.59

Details

Published: February 10, 1995 Received: November 25, 1994 Available on J-STAGE: July 04, 2006 Accepted: January 27, 1995 Advance online publication: - Revised: -
Correction information
Date of correction: July 04, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : The formation constants of the adducts of 4, 4, 4-trifluoro-1-(2-thienyl)-1, 3-butanedionatolanthanoids(III) with 2-, 3-, and 4- phenylpyridines as well as the distribution constants and pK_a of these pyridines were determined on the basis of data obtained by solvent extraction from a 0.1mol/dm³ sodium perchlorate solution into chloroform containing TTA and/or pyridines. It has been found that the adduct formation constants(β) of a given lanthanoid(III) chelate increase along with increased pK_a of the phenylpyridine, and that the constants do not change much from light to middle lanthanoids, and then decrease for heavy ones. The constants for the 2-phenylpyridine adduct are lower than expected, possibly reflecting a steric effect. The pattern of a plot of log β₁ versus the atomic number is different from that with carboxylic acids and bidentate amines.
Right : The formation constants of the adducts of 4, 4, 4-trifluoro-1-(2-thienyl)-1, 3-butanedionatolanthanoids(III) with 2-, 3-, and 4- phenylpyridines as well as the distribution constants and pK_a of these pyridines were determined on the basis of data obtained by solvent extraction from a 0.1mol/dm³ sodium perchlorate solution into chloroform containing TTA and/or pyridines. It has been found that the adduct formation constants(β) of a given lanthanoid(III) chelate increase along with increased pK_a of the phenylpyridine, and that the constants do not change much from light to middle lanthanoids, and then decrease for heavy ones. The constants for the 2-phenylpyridine adduct are lower than expected, possibly reflecting a steric effect. The pattern of a plot of log β₁ versus the atomic number is different from that with carboxylic acids and bidentate amines.

Date of correction: July 04, 2006 Reason for correction: - Correction: PDF FILE Details: -

Download PDF (247K)
Download citation RIS
(compatible with EndNote, Reference Manager, ProCite, RefWorks)

BIB TEX
(compatible with BibDesk, LaTeX)

Text

How to download citation
Contact us

Abstract

The formation constants of the adducts of 4, 4, 4-trifluoro-1-(2-thienyl)-1, 3-butanedionatolanthanoids(III) with 2-, 3-, and 4- phenylpyridines as well as the distribution constants and pK_a of these pyridines were determined on the basis of data obtained by solvent extraction from a 0.1mol/dm³ sodium perchlorate solution into chloroform containing TTA and/or pyridines. It has been found that the adduct formation constants(β) of a given lanthanoid(III) chelate increase along with increased pK_a of the phenylpyridine, and that the constants do not change much from light to middle lanthanoids, and then decrease for heavy ones. The constants for the 2-phenylpyridine adduct are lower than expected, possibly reflecting a steric effect. The pattern of a plot of log β₁ versus the atomic number is different from that with carboxylic acids and bidentate amines.

Corresponding author

Correction information