TERMIUM Plus®
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LIAISON PLUSIEURS CENTRES [1 record]
Record 1 - internal organization data 2011-02-11
Record 1, English
Record 1, Subject field(s)
- Chemistry
Record 1, Main entry term, English
- multi-centre bond
1, record 1, English, multi%2Dcentre%20bond
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 OBS
Representation of some molecular entities solely by localized two-electron two-centre bonds appears to be unsatisfactory. Instead, multi-centre bonds have to be considered in which electron pairs occupy orbitals encompassing three or more atomic centres. Examples include the three-centre bonds in diborane, the delocalized [pi]-bonding of benzene, and bridged carbocations. 1, record 1, English, - multi%2Dcentre%20bond
Record number: 1, Textual support number: 2 OBS
The word "pi" must be replaced by the corresponding Greek letter. 2, record 1, English, - multi%2Dcentre%20bond
Record 1, French
Record 1, Domaine(s)
- Chimie
Record 1, Main entry term, French
- liaison à plusieurs centres
1, record 1, French, liaison%20%C3%A0%20plusieurs%20centres
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
Si l'on ne fait intervenir que des liaisons à deux électrons localisées sur deux centres, la représentation de certaines entités moléculaires n'apparaît pas comme satisfaisante. Il est alors nécessaire de considérer des liaisons à plusieurs centres dans lesquelles les paires d'électrons occupent des orbitales englobant trois centres atomiques ou davantage. Les liaisons à trois centres du diborane et des carbocations pontés ainsi que les liaisons-[pi] délocalisées du benzène, sont des exemples de liaisons à plusieurs centres. 1, record 1, French, - liaison%20%C3%A0%20plusieurs%20centres
Record number: 1, Textual support number: 2 OBS
Le mot «pi» doit être remplacé par la lettre grecque correspondante. 2, record 1, French, - liaison%20%C3%A0%20plusieurs%20centres
Record 1, Spanish
Record 1, Textual support, Spanish
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