crystal shapecatanionic amphiphileThe aggregation behavior of three alkylammonium perfluorocarboxylates (C_nH_(2n+1)NH_3~+C_mF_(2m+1)COO~-; n+m=15, n=2,4,6) were investigated by rheology and polarization microscopy. The amphiphiles with n=8,10 were quite stable and hardly soluble in ...
Most enantiomeric substrates studied so far are amine compounds since oxygen and nitrogen containingmacrocyclesform stable complexes with ammonium cations[176–177]. Several articles on chiral macrocycles have been published in which synthesis and their enantiomeric recognition abilities were described[132–...
A recent study, carried out bySantos et al. (2019), has shown that in case of controlled linear and star-shapedcopolymers, based on hydrophobic poly(butyl acrylate) and cationic poly(3-acrylamidopropyl)trimethyl ammoniumchloride moieties, obtained via supplemental activator and reducing ATRP, the ...
Nonconjugated and nonaromatic luminophores based on clustering-triggered emission derived from through-space conjugation have drawn emerging attention in recent years. The reported nonconventional luminophores are emissive in concentrated solution and/or
Explain the VSEPR theory in detail and give examples of molecules for each molecular shape. Valence Shell: The shell that lies outermost in an element is the valence shell. The electrons present in the valence shells are valence electrons. The number of valence elect...
The above procedure was applied to 28 (2.1 mg, 0.0017 mmol), using tetra-n-butyl-ammonium fluoride (25 mg, 0.078 mmol, 8 equivalents) in THF (1 mL). At the end, the1H NMR spectrum again showed only the presence of 24 and no. 28. ...
What is the molecular geometry of dimethyl sulfide? What is the molecular geometry of H3O+? Which molecule or ion does not have a trigonal pyramidal molecular geometry? What is the electron geometry and molecular geometry around the central atom in ammonium? What is the electron geometry and mol...
9. The method of claim 8 wherein the multi-cyclic amine or ammonium compound comprises a tricycle or tetracyclic amine or animonium compound. 10. The method of claim 7 wherein said organic directing agent is an N-alkyl-3-quinuclidinol, an N,N,N-tri-alkyl-1-adarnantylammoniam compound...
A 50–100 nm thick layer of a thermotropic wedge-shaped LC monomer with a cationic triethylammonium head was coated on a polysulfone and nonwoven polyester support (Fig. 15a–c). After polymerization of the LC structure, nanoporous films with pore sizes around 0.6 nm were obtained. Single ...
Ammonium pillar[5]arene (4[5]) with ten quaternary ammonium groups was also used as the stabilizer for the preparation of Au NPs.36 4[5]-modified Au NPs successfully demonstrated the promising synergistic effects of the hybridization through SERS detection of 2-naphthoic acid and pyrene guests,...