Cation coordination by calix[4]arenes bearing amide and/or phosphine oxide pendant groups: how many arms are needed to bind Li+vs. Na+? A combined NMR and molecular dynamics study
Abstract
Combined spectroscopic and theoretical studies have been performed on two recently developed calix[4]arenes in the cone conformation, L1 (bearing two –CH2C(O)NEt2 and two –CH2P(O)Ph2 substituents occupying respectively distal phenolic positions) and L2 (with four –CH2P(O)Ph2 substituents), in order to compare the Li+vs. Na+