Synthesis and surface properties of N‐long chain alkyl dihydroxy monoazacrown ethers

Abstract

AbstractA series of N‐alkyl dihydroxy monoazacrown ethers (1) was synthesized, and their surface properties were investigated compared to those of N‐alkyl monoazacrown ethers (2) and open chain oxyethylenated long chain alkylamines (3). The complexation ability of1 toward alkali metal cations, a distinguished characteristic of crown compounds, was deduced to work even in the aqeuous solution from the values of TCP, although it is weaker than typical monoazacrown ethers (2). The presence of two hydroxyl groups contributes to the large increase in hydrophilicity of monoazacrown ring and to the large surface excess of the surfactant molecule (1). A small occupation area to the solution surface is noted as a characteristic feature of the title coumpound (1).