Complexation Studies of Zn2+, Cu2+, Co2+, Ni2+ and Cd2+ Ions with a Schiff Base Ligand

• Main Author: Mahmood Payehghadr
• Format: Article
• Language: English
• Published: Universidade Federal de Mato Grosso do Sul 2017-10-01
• Series: Orbital: The Electronic Journal of Chemistry
• Subjects: complexation; formation constants; schiff bases; spectrophotometry
• Online Access: http://orbital.ufms.br/index.php/Chemistry/article/view/1014

<p>The complex-formation reactions between Zn²⁺, Cu²⁺, Co²⁺, Ni²⁺ and Cd²⁺ ions with, <em>N,N</em>'–Bis-(salicylidene)1,8-diamino-3,6-dioxaoctan Schiff base ligand, has been studied by spectrophotometric  method in acetonitrile at various temperatures. The formation constant (<em>K_f</em>) and the molar absorptivity (ε) of the resulting complexes between ligand and different cations were calculated by fitting the observed absorbance at various [M²⁺]/[L] mole ratios and found that the stability of the resulting L-M²⁺ complexes varied in the order Cu²⁺ &gt; Zn²⁺ &gt; Co²⁺ &gt; Ni²⁺ &gt; Cd²⁺. The enthalpy and entropy changes of the complexation reaction were determined from the temperature dependence of the formation constants.</p><p> </p><p>DOI: <a href="http://dx.doi.org/10.17807/orbital.v9i4.1014">http://dx.doi.org/10.17807/orbital.v9i4.1014</a></p><p> </p>