polynuclear aromatics

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• Non-Kekulé molecule — Examples of non Kekulé (a) polyenes, (b) quinodimethanes, and (c) polynuclear aromatics A non Kekulé molecule is a conjugated hydrocarbon that cannot be assigned classical Kekulé structures. Since non Kekulé molecules have two or more formal… …   Wikipedia

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• 92-83-1 — Xanthène Xanthène Général Nom IUPAC 9H xanthène No CAS …   Wikipédia en Français

• Thioxanthène — Général No CAS …   Wikipédia en Français

• Xanthène — Général Nom IUPAC 9H xanthène No CAS …   Wikipédia en Français

• Aromaticity — is a chemical property in which a conjugated ring of unsaturated bonds, lone pairs, or empty orbitals exhibit a stabilization stronger than would be expected by the stabilization of conjugation alone. It can also be considered a manifestation of… …   Wikipedia

• Cluster chemistry — In chemistry, a cluster is an ensemble of bound atoms intermediate in size between a molecule and a bulk solid. Clusters exist of diverse stoichiometries and nuclearities. For example, carbon and boron atoms form fullerene and borane clusters,… …   Wikipedia

• Carcinogen — The term carcinogen refers to any substance, radionuclide or radiation that is an agent directly involved in the promotion of cancer or in the fatation of its propagation. This may be due to ability to damage the genome or to the disruption of… …   Wikipedia