Abstract
Abstract13C NMR spectra of cis‐cyclohexyl‐15‐crown‐5 ether in the temperature range 298–173 K have been recorded. A single degenerate conformational process, attributed to cyclohexyl ring inversion, has been detected with a barrier of ca 10.3 kcal mol‐1. Sodium ion complexation increases this barrier by ca 0.5 kcal mol−1, whereas potassium ion complexation has no measurable effect. Spin‐lattice relaxation time results also indicate more effective complexation of sodium ion than potassium ion by the macrocyclic crown ether system.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have