Complexation of palladium(II) with thiocyanate - a spectrophotometric investigation

被引：8

作者：

Le Roux, C. J. ^{[1
]}

Gans, P. ^{[2
]}

Kriek, R. J. ^{[1
]}

机构：

[1] North West Univ, Res Focus Area Chem Resource Beneficiat CRB, PGM Grp, Potchefstroom, South Africa

[2] Proton Software, Leeds, W Yorkshire, England

来源：

JOURNAL OF COORDINATION CHEMISTRY | 2014年 / 67卷 / 09期

关键词：

Palladium(II); Thiocyanate; Complexation; Formation constants; Spectrophotometry; STABILITY; CONSTANTS; METALS;

D O I：

10.1080/00958972.2014.918264

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A spectrophotometric investigation into the complexation of palladium(II) with thiocyanate revealed the existence of five coordinated palladium(II) complexes. Molar absorbance spectra as well as formation constants were calculated for all five complexes. Complex-formation of Pd(II) with thiocyanate has been investigated by spectrophotometry at 25 degrees C and an ionic strength of 1.0 M. The formation constants, beta(n), for the palladium(II) thiocyanate complexes [Pd(SCN)(n)(H2O)(4-n)](2-n) (n = 0-4), have been determined and the values are: log beta(1) = 8.14, log beta(2) = 15.46, log beta(3) = 21.94, and log beta(4) = 27.42. These complexes are generally accepted to be square planar. However, a five-coordinate species, i.e. [Pd(SCN5](3-), with a formation constant of log beta(5) = 31.94 seems to exist and is proposed to be square pyramidal. Molar absorption spectra for all the complexes in question have been obtained.

引用

页码：1520 / 1529

页数：10

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