Related Experiment Video
Updated: Jun 16, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Differential behavior of amino-imino constitutional isomers in nonlinear optical processes
Sonia Latorre1, Ibério de P R Moreira, Belén Villacampa
1Departament de Química Orgànica, Institut de Nanociències i Nanotecnologia (IN2UB), Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain.
Abstract:
A detailed study of the "blocked" amino-imino tautomers derived from N-acridine-substituted 2-aminobenzothiazole--and their effect on the nonlinear optical response--is presented. The synthesis, characterization, and nonlinear optical properties of these frozen tautomers, namely, N-methyl-N-(2-nitroacridin-6-yl)-2-aminobenzothia-zole and 3-methyl-N-(7-nitroacridin-3-yl)-2-iminobenzothiazole, are reported. A theoretical model based on valence-bond theory is also proposed and used to analyze the effects of the nuclear configuration corresponding to each frozen tautomer structure. In the present case, the aromatic form and the allylic-anion-like system of the -N-C-N- group inherent to each isomer are crucial for understanding and analyzing the different responses of each "blocked" tautomer.
Related Concept Videos
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Properties of Enantiomers and Optical Activity
Isomerism
Structure of Amines
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
Stereoisomerism of Cyclic Compounds

