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- Diradical abstract "A diradical in organic chemistry is a molecular species with two electrons occupying two degenerate molecular orbitals (MO). They are known by their higher reactivities and shorter lifetimes. In a broader definition diradicals are even-electron molecules that have one fewer bond than the number permitted by the standard rules of valence. If the electrons are of antiparallel spin, the molecule is said to be in a singlet state. Alternatively, the electrons can be of parallel spin, which constitutes being in the triplet state. The related radical has just one free electron. The phrases singlet and triplet are derived from the multiplicity of states of diradicals in electron spin resonance: a singlet diradical has one state (S=0, Ms=2*0+1=1, ms=0) and exhibits no signal in EPR and a triplet diradical has 3 states (S=1, Ms=2*1+1=3, ms=-1;0;1) and shows in EPR 2 peaks (if no hyperfine splitting).The triplet state has total spin quantum number S = 1 and is paramagnetic. The singlet state has S = 0 and is diamagnetic. The degeneracy of each state can be found with Hund's rule of maximum multiplicity: 2S + 1. In molecules the free electrons can reside on one atom or on different atoms. A molecule can have a singlet state or triplet state with different energy and both states can inter-convert by a process called intersystem crossing. Phosphorescence is based on this principle.Discrete molecules with a diradical nature are singlet oxygen and triplet oxygen. Other important diradicals are carbenes and nitrenes. Lesser known diradicals are nitrenium ions and organic so-called non-Kekulé molecules in which the electrons reside on different carbon atoms.".
- Diradical wikiPageExternalLink diradical.html.
- Diradical wikiPageID "4098636".
- Diradical wikiPageLength "3316".
- Diradical wikiPageOutDegree "23".
- Diradical wikiPageRevisionID "631959051".
- Diradical wikiPageWikiLink Carbene.
- Diradical wikiPageWikiLink Category:Organic_chemistry.
- Diradical wikiPageWikiLink Degenerate_energy_level.
- Diradical wikiPageWikiLink Degenerate_energy_levels.
- Diradical wikiPageWikiLink Diamagnetic.
- Diradical wikiPageWikiLink Diamagnetism.
- Diradical wikiPageWikiLink Electron.
- Diradical wikiPageWikiLink Electron_paramagnetic_resonance.
- Diradical wikiPageWikiLink Electron_spin_resonance.
- Diradical wikiPageWikiLink Hunds_rule_of_maximum_multiplicity.
- Diradical wikiPageWikiLink Intersystem_crossing.
- Diradical wikiPageWikiLink Molecular_orbital.
- Diradical wikiPageWikiLink Molecule.
- Diradical wikiPageWikiLink Nitrene.
- Diradical wikiPageWikiLink Nitrenium_ion.
- Diradical wikiPageWikiLink Non-Kekulé_molecule.
- Diradical wikiPageWikiLink Organic_chemistry.
- Diradical wikiPageWikiLink Paramagnetic.
- Diradical wikiPageWikiLink Paramagnetism.
- Diradical wikiPageWikiLink Phosphorescence.
- Diradical wikiPageWikiLink Radical_(chemistry).
- Diradical wikiPageWikiLink Singlet_oxygen.
- Diradical wikiPageWikiLink Singlet_state.
- Diradical wikiPageWikiLink Spin_(physics).
- Diradical wikiPageWikiLink Spin_quantum_number.
- Diradical wikiPageWikiLink Triplet_oxygen.
- Diradical wikiPageWikiLink Triplet_state.
- Diradical wikiPageWikiLinkText "Diradical".
- Diradical wikiPageWikiLinkText "biradicals".
- Diradical wikiPageWikiLinkText "diradical".
- Diradical wikiPageWikiLinkText "singlet state".
- Diradical wikiPageWikiLinkText "singlet".
- Diradical wikiPageWikiLinkText "triplet state".
- Diradical wikiPageWikiLinkText "triplet".
- Diradical hasPhotoCollection Diradical.
- Diradical wikiPageUsesTemplate Template:Cite_web.
- Diradical wikiPageUsesTemplate Template:Distinguish.
- Diradical wikiPageUsesTemplate Template:Reflist.
- Diradical subject Category:Organic_chemistry.
- Diradical hypernym Species.
- Diradical type Eukaryote.
- Diradical type Thing.
- Diradical comment "A diradical in organic chemistry is a molecular species with two electrons occupying two degenerate molecular orbitals (MO). They are known by their higher reactivities and shorter lifetimes. In a broader definition diradicals are even-electron molecules that have one fewer bond than the number permitted by the standard rules of valence. If the electrons are of antiparallel spin, the molecule is said to be in a singlet state.".
- Diradical label "Diradical".
- Diradical differentFrom Non-Kekulé_molecule.
- Diradical sameAs m.02p7x72.
- Diradical sameAs Q5280165.
- Diradical sameAs Q5280165.
- Diradical wasDerivedFrom Diradical?oldid=631959051.
- Diradical isPrimaryTopicOf Diradical.