74421-58-2Relevant articles and documents
Wentworth,Felten
, p. 621 (1968)
C3-Symmetric, amino acid based organogelators and thickeners: a systematic study of structure-property relations
de Loos, Maaike,van Esch, Jan H.,Kellogg, Richard M.,Feringa, Ben L.
, p. 7285 - 7301 (2008/02/05)
A class of C3-symmetric amino acid based organogelators and thickeners featuring a rigid core have been developed. Structural variation yielded a number of compounds, the aggregation behaviour and resulting aggregates and gels of which were studied by FTIR spectroscopy, dropping ball measurements, differential scanning calorimetry and transmission electron microscopy. These studies showed that the nature of the core unit, the type of hydrogen-bonding units and the applied amino acids have a strong influence on the interactions, resulting in large differences in aggregation properties, thermal stability and morphology between the various compounds. The results provide a basis for a better understanding of the relation between aggregate/gel properties and molecular structure. The structural variation available for these compounds allows fine-tuning of the gelators with respect to aggregation behaviour and gel properties.
Analysis of the Proton, Carbon, and Nitrogen NMR Spectra of cis,cis- and cis,trans-1,3,5-Triaminocyclohexane
Yu, Chin,Dumoulin, Charles L.,Levy, George C.
, p. 952 - 958 (2007/10/02)
The proton spectrum of the isomeric mixture of cis,cis- and cis,trans-1,3,5-triaminocyclohexane was assigned with a 2D COSY experiment.Using Forrest's modified equation and the 2D J spectrum results, the conformations of the two isomers were analysed.The six-membered ring of the cis,trans isomer is flattened by 1,3-diaxial interactions between two amino substituents; in the cis,cis isomer, ring pucker is increased owing to non-bonded interaction between the equatorial amino groups and adjacent methylene protons.The 13C and 15N spin-lattice relaxation of the two isomeric 1,3,5-triaminocyclohexanes was also measured at different pH values; NHx groups rotate faster with decreasing pH.Rotation/jump rates and barriers are reported, determined from the NT1DD ratios between 15N and 13C nuclei.
