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	X線結晶構造解析	クリスタル場理論	配位子場解析
分野	化学	化学	化学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1912	1929	1960s
提唱者	William Henry Bragg & William Lawrence Bragg	Hans Bethe	Brian Norman Figgis
種類	Structural determination technique	Theoretical model	Theoretical model
原典	Bragg, W. H., & Bragg, W. L. (1913). The reflection of X-rays by crystals. Proceedings of the Royal Society of London, 88(605), 428–438.	Bethe, H. (1929). Termaufspaltung in Kristallen. Annalen der Physik, 3(5), 133–208.	Figgis, B. N. (1966). Introduction to Ligand Fields. Interscience Publishers. ISBN: 978-0471257356
別名	X-ray diffraction, crystallography, single-crystal X-ray	CFT, crystal field, ligand field theory	ligand field, LFT, ligand field theory
関連	3	3	3
概要	X-ray crystallography is a technique that determines the three-dimensional atomic structure of crystals by analyzing the diffraction patterns produced when X-rays pass through them. Developed by William Henry Bragg and William Lawrence Bragg in 1912, X-ray crystallography has become the gold standard for structure determination in chemistry, biochemistry, and materials science, winning multiple Nobel Prizes for its profound impact.	Crystal Field Theory (CFT) is a model that explains the electronic structure, color, magnetism, and reactivity of coordination complexes by considering how the electric field created by surrounding ligands perturbs the d-orbitals of a central metal ion. Developed by Hans Bethe in 1929 and refined throughout the 20th century, CFT is one of the most powerful tools for understanding inorganic chemistry.	Ligand Field Theory (LFT) is an advanced model of metal-ligand bonding that combines crystal field theory with molecular orbital theory. Developed systematically by Brian Norman Figgis and others from the 1960s onward, LFT provides quantitative predictions of electronic structure, magnetism, spectra, and reactivity of coordination complexes, bridging the gap between qualitative crystal field arguments and rigorous quantum mechanics.