Molecular arrangements of alkyl-ammonium salts and aromatic additives in complex crystals

Abstract

Recently, it has been found that some amphiphile molecules such as ammonium salts, phosphonimn salts and other onium salts have the specific abilities to fom1 complexes v.ith aromatic molecules. In some cases, tl1e fmmation of complexes can be prepared simply by mi.,-dng both powders of amphiphiles and aromatic molecules in a mortar (Toda,

Effect of fluorinated ammonium counterions upon the reversibility in E–Z photoisomerization of azobenzene ion pair films

“…The orientation of the component molecules, i.e., the azobenzene and the component ions (FOAM 1 and HOAM 1 ) for these fluoro-and non-fluoro-surfactant ion pairs in the solid films, was determined by measuring the polarized absorption spectra of the molecular self-assembled films in the UV-vis and IR regions. 9, 12,[17][18][19][20][21][22][23][24] The UV and IR spectroscopic absorbances are proportionally dependent on the square of the optical transition moments of the component molecules, which can be…”

Intercalation of cations in crystalline anionic surfactants

“…The enthalpy at melting transformation was estimated by the integration of the DSC peak, and the entropy was calculated by eqn. (1), where ∆S, ∆H and T mp are the entropy ∆S = Ϫ∆H/T mp (1) of melting transformation, the enthalpy of melting transformation, and the melting temperature, respectively.…”

“…The crystalline state of surfactants has been of interest from the viewpoint of supramolecular chemistry. 1 Crystals of surfactants have a bilayer structure similar to that of a cell membrane organized with phospholipid. 2,3 Some surfactants crystallize as inclusion compounds with small organic molecules.…”

“…2,3 Some surfactants crystallize as inclusion compounds with small organic molecules. 1 Counter ions are located in the crystals of ionic surfactants between anionic layers forming a structure like clathrate compounds. The crystals of surfactants are also of interest from the classical viewpoint.…”

The Effects of Molecular Conformation and Chain Length in Complexes of Tetra-n-alkylammonium Halide with Nonplanar Aromatic Molecule

“…Thus far, many hydrogen bonding patterns and packing fashions in complexes of di-,trialkylammonium halides with planar and nonplanar aromatic molecules that can be used for manipulation of the spatial arrangement of molecules in the solid-state have been identified and reported [6][7][8][9][10]. However, in respect to research studies on complexes of tetra-nalkylammonium halides (n = 4, 5, .…”