Z.-Q. Li

Hunan University, Ch’ang-sha-shih, Hunan, China

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Publications (2)4.11 Total impact

  • Z.-Q. Li · D.-S. He · G.-L. Shen · R.-Q. Yu
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    ABSTRACT: We systematically investigated the response characteristics upon anions of three types of organotin (IV) complexes. The results show that there are close relationship between the potentiometric response characteristics and structure of organotin (IV) complexes. These complexes exhibit selective potentiometric response to salicylate. The electrodes based on tetracoordinated organotin complexes show near - Nernst response to salicylate while the electrodes based on pentacoordinated and hexacoordinated organotin complexes show super - Nerst response to salicylate. Above all, the response characteristics are influenced heavily by properties of the central metal. As properties of organic groups that connect directly to tin atom change, the potentiometric response characteristics and selectivity vary regularly. The relationship between structure of carriers and electrode performances are described by Hammett constant. The response mechanism was also investigated by use of impedance and IR spectroscopic techniques. The super - Nernst phenomena and response characteristics of electrodes based on hexacoordinated organotin complexes were also interpreted in this paper.
    No preview · Article · Jan 2000
  • Min Ying · Ruo Yuan · X M Zhang · Y Q Song · Z Q Li · G L Shen · R Q Yu
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    ABSTRACT: A PVC membrane electrode based on a nickel(II) tetraazaannulene macrocyclic complex as the carrier is described. The electrode exhibits an anti-Hofmeister selectivity sequence with a preference for iodide at pH 3.0-4.0. It has a linear response to iodide from 8.0 x 10(-6) to 1 x 10(-1) mol dm-3 with a slope of -54.7 +/- 0.2 mV per decade (20 degrees C), a satisfactory reproducibility and a rapid response time. The pH dependence of the potential response is discussed. The response mechanism of the electrode was investigated by ac impedance, quartz crystal microbalance and spectroscopic techniques. The electrode can be used for the determination of iodide in drug preparations.
    No preview · Article · Nov 1997 · The Analyst