nucleophile


nucleophile
nucleophile [no͞o′klē ə fīl΄, nyo͞o′klē ə fīl΄]
n.
NUCLEO- + -PHILE
an atom or molecule that has an affinity for atomic nuclei or that donates electrons to form a covalent bond
nucleophilic [no͞o′klē əfil′ik, nyo͞o′klē əfil′ik]
adj.

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nu·cle·o·phile (no͞oʹklē-ə-fīl', nyo͞oʹ-) n.
A chemical compound or group that is attracted to nuclei and tends to donate or share electrons.

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Atom or molecule that contains an electron pair available for bonding and in chemical reactions therefore seeks a positive centre, such as the nucleus of an atom or the positive end of a polar molecule (see covalent bond; electric dipole).

In the Lewis electron theory (see acid-base theory), advanced by the U.S. chemist Gilbert Lewis (1875–1946) in 1923, nucleophiles are by definition Lewis bases. Examples include the hydroxide ion (OH-), the ions of the halogens chlorine, bromine, and iodine (Cl-, Br-, and I-, respectively), ammonia (NH3), and water (H2O). See also base; electrophile.

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      in chemistry, an atom or molecule that in chemical reaction seeks a positive centre, such as the nucleus of an atom, because the nucleophile contains an electron pair available for bonding. Examples of nucleophiles are the halogen anions (I-, Cl-, Br-), the hydroxide ion (OH-), the cyanide ion (CN-), ammonia (NH3), and water. Compare electrophile.

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Universalium. 2010.

Look at other dictionaries:

  • Nucleophile — Nucléophile En chimie, un nucléophile (littéralement qui aime les noyaux, donc qui aime les charges positives) est un composé chimique attiré par les espèces chargées positivement, par opposition à un composé électrophile. Un nucléophile réagit… …   Wikipédia en Français

  • nucléophile — [ nykleɔfil ] n. m. et adj. • 1964; de nucléo et phile ♦ Chim. Particule chimique ayant de l affinité pour un noyau auquel elle donne ou avec lequel elle partage un ou plusieurs électrons. Adj. Réaction nucléophile. ● nucléophile adjectif et nom… …   Encyclopédie Universelle

  • nucleophile — [no͞o′klē ə fīl΄, nyo͞o′klē ə fīl΄] n. [ NUCLEO + PHILE] an atom or molecule that has an affinity for atomic nuclei or that donates electrons to form a covalent bond nucleophilic [no͞o′klē əfil′ik, nyo͞o′klē əfil′ik] adj …   English World dictionary

  • Nucleophile — A nucleophile is a species that donates an electron pair to an electrophile to form a chemical bond in a reaction. All molecules or ions with a free pair of electrons can act as nucleophiles. Because nucleophiles donate electrons, they are by… …   Wikipedia

  • Nucléophile — En chimie, un nucléophile (littéralement qui aime les noyaux, donc qui aime les charges positives) est un composé chimique attiré par les espèces chargées positivement, par opposition à un composé électrophile. Un nucléophile réagit en donnant… …   Wikipédia en Français

  • nucleophile — nukleofilas statusas T sritis chemija apibrėžtis Dalelė, turinti laisvą elektronų porą ar didesnį elektronų tankį. atitikmenys: angl. nucleophile rus. нуклеофил …   Chemijos terminų aiškinamasis žodynas

  • nucleophile — noun Date: 1943 a nucleophilic substance (as an electron donating reagent) …   New Collegiate Dictionary

  • nucleophile — noun a compound or functional group that is attractive to centres of positive charge, and donates electrons, especially donating an electron pair to an electrophile to form a bond See Also: nucleophilic …   Wiktionary

  • nucleophile — nu·cleo·phile n(y)ü klē ə .fīl n a nucleophilic substance (as an electron donating reagent) * * * nu·cleo·phile (nooґkle o fīl″) an electron donor in chemical reactions involving covalent catalysis in which the donated electrons bond… …   Medical dictionary

  • nucleophile — nu·cleo·phile …   English syllables


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