Abstract
A thermodynamic study of the complexation of Cu2+, Pb2+, Zn2+ and Cd2+ ions with 1 and 2 in acetonitrile has been carried out. The study was conducted in the temperature range 283–308 K using a conductometric technique. The observed molar conductivity, Λ, was found to decrease significantly for mole ratios [L]t/[M]t less than unity in all cases. A model involving 1:1 stoichiometry has been used to analyze the conductivity data. The stability constant, K, for each 1:1 complex was determined from the conductivity data by using a nonlinear least-squares curve fitting procedure. The results show that compound 1 has no peak selectivity for any of the metal cations, while compound 2 selectively associates with Cu2+ and Pb2+. Complexes of 1 have the following stability order Pb2+ > Cu2+ > Zn2+ > Cd2+ and Pb2+ > Cu2+ for the complexes of 2. The ∆H° and ∆S° values for the complexation process were obtained from the slope and intercept of the Van’t Hoff plots respectively. All ∆G° values were negative and were determined from the Gibbs–Helmholtz equation and the significance of these values is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Inclusion Phenomena and Macrocyclic Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
