e/Metal aromaticity

Information
has gloss	eng: In metal aromaticity the concept of aromaticity found in many hydrocarbons is extended to metals. The first experimental evidence for the existence of aromaticity in metals was found in aluminium cluster compounds of the type MAl4- where M stands for lithium, sodium or copper. These anions can be generated in a helium gas by laser vaporization of an aluminium / lithium carbonate composite or a copper or sodium / aluminium alloy, separated and selected by mass spectrometry and analyzed by photoelectron spectroscopy. The evidence for aromaticity in these compounds is based on several considerations. Computational chemistry shows that these aluminium clusters consist of a tetranuclear Al42- plane and a counterion at the apex of a square pyramid. The Al42- unit is perfectly planar and is not perturbed the presence of the counterion or even the presence of two counterions in the neutral compound M2Al4. In addition its HOMO is calculated to be a doubly-occupied delocalized pi system making it obey Hückel's rule. Finally a match exists between the calculated values and the experimental photoelectron values for the energy required to remove the first 4 valence electrons.
lexicalization	eng: Metal aromaticity
instance of	(noun) a hydrocarbon containing one or more benzene rings that are characteristic of the benzene series of compounds aromatic compound

Meaning
Portuguese
has gloss	por: Na aromaticidade metálica, o conceito de aromaticidade encontrado em muitos hidrocarbonetos se estende aos metais. A primeira evidência experimental da existência de aromaticidade em metais foi encontrada em compostos do tipo clusters de alumínio do tipo MAl4-, onde M pode ser também lítio, sódio ou cobre.
lexicalization	por: Aromaticidade metálica
Castilian
has gloss	spa: En la aromaticidad metálica, el concepto de aromaticidad encontrado en muchos hidrocarburos se extiende a los metales. La primera evidencia experimental de la existencia de aromaticidad en metales fue encontrada en clusters del tipo MAl4-, donde M puede ser litio, sodio o cobre. Estos aniones pueden ser generados en helio gaseoso por vaporización láser de un composite de aluminio / carbonato de litio, o una aleación de cobre o sodio / aluminio, separada y seleccionada por espectrometría de masas y analizada por espectroscopia fotoelectrónica. La evidencia para la aromaticidad de estos compuestos está basada en algunas consideraciones. La química computacional muestra que estos clusters de aluminio consisten de un anión tetranuclear Al42- plano y un contraión en la cima de una pirámide cuadrada.
lexicalization	spa: Aromaticidad metalica
lexicalization	spa: Aromaticidad metálica