Non-Metal Chemistry
Summary
Non-metal chemistry encompasses the study of elements that do not exhibit metallic bonding, including the noble gases, halogens, chalcogens, pnictogens and metalloids such as boron and silicon. These elements form an extraordinary variety of bonding motifs—from classic two-centre two-electron covalent bonds to multicentre delocalised frameworks, charge-transfer adducts and weak non-covalent assemblies driven by σ- and π-hole interactions. Non-metal chemistry underpins key applications in energy conversion (for example, phosphorus-based ligands in catalysis and silicon-based materials in photovoltaics), environmental monitoring (noble-gas tracers for groundwater dating and greenhouse-gas sensing), and advanced functional materials (boron-rich cages for drug delivery and halogen-bonded networks in optoelectronics). Recent progress in spectroscopic methods, matrix isolation and high-level quantum chemistry has revealed unexpected species—such as aromatic noble-gas hydrides and superhalogen clusters—challenging conventional valence rules and expanding the landscape of sustainable and high-performance technologies.
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Non-Metal Chemistry publication trend
The graph below shows the total number of articles in non-metal chemistry across all publications each year (not limited to Nature Index journals).
Technical terms
Triel bond: A directional non-covalent attraction between an electron-deficient group 13 element centre and an electron-rich site.
σ-hole: A region of positive electrostatic potential located on the extension of a covalent bond, enabling directional bonding to Lewis bases.
π-hole: An electron-deficient area above or below a molecular plane formed by electron-withdrawing substituents, facilitating interaction with π-donors.
Lewis acid: A species that accepts an electron pair, often bearing an empty orbital or positive region of electrostatic potential.
Energy decomposition analysis: A computational technique that partitions interaction energy into electrostatic, orbital (charge-transfer), dispersion and repulsion components.
References
- Ga···C Triel Bonds—Why They Are Not Strong Enough to Change Trigonal Configuration into Tetrahedral One: DFT Calculations on Dimers That Occur in Crystal Structures. International Journal of Molecular Sciences (2023).
- Triel Bonds between BH3/C5H4BX and M(MDA)2 (X = H, CN, F, CH3, NH2; M = Ni, Pd, Pt, MDA = Enolated Malondialdehyde) and Group 10 Transition Metal Electron Donors. Molecules (2024).
- Triel Bond Formed by Malondialdehyde and Its Influence on the Intramolecular H-Bond and Proton Transfer. Molecules (2022).
- An aromatic noble-gas hydride: C6H5CCXeH. Scientific Reports (2017).
- Iron-based magnetic superhalogens with pseudohalogens as ligands: An unbiased structure search. Scientific Reports (2017).
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