Chromogenic azole diazothiacrown ethers

Abstract

Azocrown ethers with sulphur atoms and pyrrole or imidazole residue as a part of macrocycle have been synthesised. Their metal complexation abilities in acetonitrile were studied using UV–vis spectrophotometry. The largest spectral changes were observed for both pyrrole- and imidazole-azothiacrown ethers on complexation with Pb^2 + , Cu^2 + , Zn^2 + , Ni^2 + , Co^2 +  and Ag⁺ ions. In the case of alkali and alkaline earth metal ions no spectral changes were found. Preliminary studies of ion-selective membrane electrodes with synthesised ionophores are presented. In the measurement for transition/heavy metal cations, only copper and lead give high responses. X-ray structure of 18-membered pyrrole azothiacrown ether is described.

Keywords:

• chromoionophores
• azole azothiacrowns
• X-ray structure
• complexation
• ion-selective electrodes

Acknowledgements

Financial support from the Polish State Committee for Scientific Research, Grant No. 3 T09A 151 27 is kindly acknowledged. Marina S. Fonari thanks the Foundation for Polish Science (FNP) and Mianowski Fund for received grant.

The X-ray measurements were undertaken in the Crystallographic Unit of the Physical Chemistry Laboratory at the Chemistry Department of the University of Warsaw.

Notes

^1. On leave from the Institute of Applied Physics, Academy of Science, Republic of Moldova, Kishinev, Moldova.

Additional information

Notes on contributors

Marina S. Fonari

101 1. On leave from the Institute of Applied Physics, Academy of Science, Republic of Moldova, Kishinev, Moldova.