Abstract
The complex formation between lead(II) and different noncyclic ligands, crown ethers, aza crown ethers, and cryptands has been studied in methanol by titration calorimetry. Comparing the results for the reaction of glycols, glymes, and crown ethers with Pb 2+ a macrocyclic effect is found which is caused by a favourable entropic change. By inserting nitrogen atoms into the ligands this effect disappears. A cryptate effect for the complexation of lead(II) is observed in the case of the cryptands (221) and (222), which is due to a drastic increase in Δ H . The cavity of the cryptand (211) is too small to accomodate Pb 2+ without deformation.
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 callDisclaimer: 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.
