Quantum Chemical Characterization of Silicon Complexes

Quantum chemical characterisation of silicon complexes combines advanced computational techniques with spectroscopic and crystallographic methods to elucidate the structure, bonding and reactivity of silicon-centred coordination compounds. Such investigations employ first-principles approaches to map potential energy surfaces, predict coordination geometries and evaluate electronic distributions around the silicon nucleus. Density functional theory and ab initio calculations yield insight into frontier molecular orbitals, bond dissociation energies and reaction pathways, while natural bond orbital analyses reveal donor–acceptor interactions between silicon centres and coordinated ligands. These theoretical models are routinely benchmarked against experimental data obtained from single-crystal X-ray diffraction and multinuclear nuclear magnetic resonance, notably 29Si NMR spectroscopy, which provides direct measures of coordination number and electronic environment. This synergy has led to precise descriptions of penta- and hexacoordinate silicon species, clarified the role of hypercoordinate intermediates in catalysis and informed the design of new silicon-based materials. Applications range from organosilicon catalysts and molecular sieves to novel photonic and electronic devices. On a global scale, understanding the fundamental chemistry of silicon complexes underpins developments in sustainable catalysis, energy storage and semiconductor fabrication, emphasising the broad impact of quantum chemical characterisation on both fundamental science and industrial innovation.

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Quantum Chemical Characterization of Silicon Complexes publication trend

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Technical terms

Quantum chemical calculations: Computational methods that solve electronic Schrödinger equations to predict molecular structure and properties.

Density functional theory (DFT): A quantum mechanical approach that models electron density rather than wavefunctions, balancing accuracy and computational cost.

Coordination number: The total number of atoms directly bonded to a central silicon atom in a complex.

29Si NMR spectroscopy: A nuclear magnetic resonance technique that probes the chemical environment and coordination geometry of silicon nuclei.

Potential energy surface: A multidimensional representation of energy variations with changes in molecular geometry, used to identify stable structures and reaction pathways.

References

1. Lewis Acid-Base Adducts of α-Amino Acid-Derived Silaheterocycles and N-Methylimidazole. Molecules (2023).
2. Molecular Structures of the Silicon Pyridine-2-(thi)olates Me3Si(pyX), Me2Si(pyX)2 and Ph2Si(pyX)2 (py = 2-Pyridyl, X = O, S), and Their Intra- and Intermolecular Ligand Exchange in Solution. Crystals (2022).
3. The Hexacoordinate Si Complex SiCl4(4-Azidopyridine)2—Crystallographic Characterization of Two Conformers and Probing the Influence of SiCl4-Complexation on a Click Reaction with Phenylacetylene. Inorganics (2023).