Abstract
The formation of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) complexes with calcium, strontium and barium ions has been studied by titration calorimetry in water and dimethylformamide (dmf) containing 0.1 mol dm–3 NEt4Cl and NEt4ClO4, respectively, as constant ionic media at 25 °C. The formation of the [M(18-crown-6)]2+(M = Ca2+, Sr2+ or Ba2+) complexes was revealed and their formation constants, reaction enthalpies and entropies were determined. The formation constant increases in the order Ca O > Sr > Ba. The decreasing order suggests that the difference between the desolvation energies upon complexation of the metal ions in dmf and in water is more significant for the ion of smaller size.
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 the Chemical Society, Dalton Transactions
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.
