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

Abstract

A 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 MJX-TeXAtom-ORDnormalΔfalse~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).

Synthesis and Characterization of Some Nonionic Bolaamphiphiles

“…As foreseen, surface tension values of fluorinated bolaamphiphiles 3 are lower than those of nonfluorinated analogues [20,21]. On the other hand, the increase in alkyl chain length leads to a decrease of surface tension whatever the cyclic size [22,23]. This observation is in agreement with Tanford theory [24].…”

“…However, for a given alkyl chain, surface tension increases with increases in the loop size. It is well known that, the higher the surface tension value is, the more soluble the surfactant is in water [23,25].…”

Synthesis and Surface‐Active Properties of F‐Alkylated Polar Loops

“…On the other hand, the increase in alkyl chain length leads to a decrease in surface tension whatever the loop size is [20,21] (Table 1). However, for a given alkyl chain, the surface tension increases with increasing loop size n. It is well known that the higher the surface tension value is, the more soluble is the surfactant in water [16,21].…”