Unusual luminescent octanuclear stellate platinacycle self-assembled by Pt-Ag bonds.
An unprecedented macrocyclic luminescent octanuclear cluster cyclo-[{Pt(C6Cl5)2(mu-OH)(mu-Ag)}4] (Pt-Ag) 2 was self-assembled by the formation of Pt(II)-Ag(I) bonds; the optical properties of this complex were also investigated.
Aurophilic attraction in binuclear complexes with Au(I) and Au(III). A theoretical study
Model compounds are used to study the aurophilic attraction among gold atoms in the different oxidation states Au(I)–Au(I), Au(I)–Au(III) and Au(III)–Au(III). An attraction is found for all models and there is a reasonable agreement between the experimental and theoretical geometries at the MP2 level. The dispersion, induction and electrostatic multipole components to this attraction are analyzed using intermolecular models.
Electrochemical detection of copper(II) at a gold electrode modified with a self-assembled monolayer of penicillamine
A penicillamine (PCA) self-assembled monolayer (SAM) was prepared on a gold electrode. It has been found that the modified electrode exhibited a selective response to copper ions. As demonstrated by cyclic voltammetric experiments, the SAM-based electrode showed an attractive ability to preconcentrate efficiently traces of copper(II) from solutions. Under optimum conditions, the anodic peak current was proportional to the concentration of Cu(II) in the range from 8.0 × 10−7 to 1.0 × 10−4 M with a detection limit of 4.0 × 10−7 M. Moreover, this modified gold electrode is also characterized by excellent repeatability, showing a relative standard deviation of 3.2% for nine successive measurements of 1.0 × 10−5 M Cu(II). The PCA/Au SAM gold electrode was used for the determination of Cu(II) in a tap water sample and the results showed a good agreement with the data obtained by atomic emission spectrometry.