Part I Theoretical approaches 1. Determining the strength of intermolecular interactions 2. Symmetry-adapted perturbation theory as a tool for studying triel-bonded intermolecular complexes 3. Insightful correlations between QTAIM parameters and the relative strength of noncovalent interactions 4. Electrostatic Potentials and σ-Hole and π-Holes: A Historical Perspective 5. Various theoretical approaches to analyse different kinds of interactions 6. The effect of Halogen Atoms, Neutral and anion Lewis Bases on the formation of triel-bond Part 2 Types of interactions, classifications 7. A Cartography of Named Supramolecular Interactions 8. Exploring triel bonding interactions: from fundamentals to applications 9. A Theoretical Journey Delving Into Triel Bonding: Anomalies and Interpretations Part 3 Triel bonds, different types 10. On the Evolution of Local Positive Potentials on Trivalent Group 13 Atomic Centers and their Utility in the Ouroboric Cyclization of Heteroorganic Chains 11. Triel Bonding in Thallium Compounds: Insights from X-ray Crystallography and Density Functional Theory 12. Charge-inverted hydrogen bonds 13. From localized to fully delocalized electrons: a theoretical investigation of boron cluster solvated by ammonia 14. Triel bonding in coordination chemistry 15. Triels and alkaline-earths strengthen ties: compounds and clusters between electron deficient elements 16. Anionic Systems Containing Triel Atoms as Lewis Acids Involved in Anion···Anion and Anion···Neutral Triel Bonds 17. Sequestration and activation of CO2 by intramolecular Frustrated Lewis Pairs

Overviews the field of triel bonding, addressing the steady growth in interest in the topic and lack of existing dedicated book literature Provides clear definitions and description of triel bonds, with presentation of their characteristics and the use of various theoretical approaches for them Includes numerous examples of triel interactions taken from crystal structures and from theoretical ab initio and DFT calculations Provides illustrative examples of triel elements functioning as catalysts and boron compounds as featured in hydrogen storage