Synthesis, characterisation and ion-binding properties of oxathiacrown ethers appended to [Ru(bpy)2]2+. Selectivity towards Hg2+, Cd2+ and Pb2+

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

A series of complexes with oxathiacrown ethers appended to a [Ru(bpy)2]2+ moiety have been synthesized and characterised using 1H NMR, 13C NMR, IR, electronic absorption and emission spectroscopies, mass spectrometry and elemental analyses. The complexes exhibit strong MLCT luminescence bands in the range 608-611 nm and one reversible metal centred oxidation potential in the range 1.00-1.02 V. Their selectivity and sensitivity towards Hg2+, Cd2+ and Pb2+ metal ions have been investigated using electronic absorption, luminescence, cyclic and differential pulse voltammetry titrations. Their responses towards selected cations and anions have also been investigated using electronic absorption and luminescence. While the complexes are selective towards Hg2+ and Cd2+ ions, none of them is selective towards Pb2+ ions. In particular, complex 2 gives a selective change in the UV/Vis absorbance with Hg2+ making it possible to detect mercury down to a detection limit of 68 ppm. The binding constants and limits of detection of the complexes have been calculated, with values ranging from 4.37 to 5.38 and 1.4 × 10-3 to 6.8 × 10-5 for log Ks and LOD respectively.

Detaljer

Författare
  • Ruth A. Odhiambo
  • Austin O. Aluoch
  • Lydia W. Njenga
  • Stanley M. Kagwanja
  • Shem O. Wandiga
  • Ola F. Wendt
Enheter & grupper
Externa organisationer
  • University of Nairobi
  • Technical University of Kenya
  • Chuka University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Oorganisk kemi
Originalspråkengelska
Sidor (från-till)3663-3672
Antal sidor10
TidskriftRSC Advances
Volym8
Utgivningsnummer7
StatusPublished - 2018 jan 1
PublikationskategoriForskning
Peer review utfördJa