Related Experiment Video
Updated: Apr 22, 2026
Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
A theoretical study of ternary indole-cation-anion complexes
Jorge A Carrazana-García1, Enrique M Cabaleiro-Lago, Alba Campo-Cacharrón
1Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, Campus de Lugo, Avenida Alfonso X El Sabio s/n, Lugo 27002, Lugo, Spain. jorge.carrazana@usc.es.
Cation-anion interactions with π systems like indole were studied using theoretical calculations. Cation-anion attraction strongly influences complex geometry and energy, with polarization also playing a key role.
Area of Science:
- Computational Chemistry
- Biophysical Chemistry
Background:
- Understanding ion-π interactions is crucial for biological processes.
- Indole serves as a relevant model for biological π systems.
Purpose of the Study:
- Investigate simultaneous cation and anion interactions with indole.
- Analyze the energetic and geometric contributions to ternary complex formation.
Main Methods:
- Utilized MP2 and M06-2X theoretical calculations.
- Employed local molecular orbital-energy decomposition analysis (LMO-EDA).
- Modeled solvent effects using the polarizable continuum model (PCM).
Main Results:
- Cation-anion attraction is the dominant factor in ternary complexes.
- Both electrostatic and polarization contributions are significant.
- Anti-cooperative interactions were observed when ions are on the same side of the π system.
- Polar solvents significantly weaken interaction energies.
Conclusions:
- Cation-anion interactions dictate indole complex behavior.
- Specific interactions and proton transfer influence energetics.
- PCM models solvent effects adequately, but explicit hydration offers refinement.
More Related Videos
06:44From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Related Concept Videos
02:42Valence Bond Theory
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
03:45Formation of Complex Ions
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
02:54Coordination Compounds and Nomenclature