# Ozizi Lewis nke Acid na Bases
Kemistri nke isi acid nwere ike ịdị mgbagwoju anya, dị iche iche, ma dị omimi, na-etolite isi ihe dị mkpa nke ọtụtụ usoro kemịkalụ na mmeghachi omume. N'ime ọtụtụ echiche ndị na-agbalị ịkọwa omume nke asịd na ntọala, ozizi Gilbert N. Lewis, nke e mere na 1923, na-enye echiche pụrụ iche na nke zuru oke. Ozizi Lewis na-anọgide na-enwe mkpa na kemistri nke oge a n'ihi ojiji sara mbara ya na nghọta bụ isi banyere ọdịdị nke mmekọrịta acid-base.
## Jenesis nke Ozizi Lewis
Tupu Lewis, nghọta nke asịd na ntọala bụ ihe e ji ụkpụrụ Arrhenius na Brønsted-Lowry kpụzie. Echiche Arrhenius, nke ewepụtara na 1884, kọwara asịd dị ka ihe ndị na-emepụta ion hydrogen (H⁺) na mmiri mmiri na ntọala dị ka ndị na-emepụta ion hydroxide (OH⁻). Echiche Brønsted-Lowry, nke gbanwere na 1923, gbasaa nkọwa ahụ site n'ịkọwa asịd dị ka ndị na-enye proton (H⁺) na ntọala dị ka ndị na-anabata proton. Ọ bụ ezie na echiche abụọ ahụ kọwara omume na ngwọta mmiri nke ọma, ha pere mpe n'itinye ha n'ọrụ sara mbara, karịsịa na gburugburu ebe mmiri na-adịghị ma ọ bụ mmeghachi omume na-agụnyeghị ion hydrogen.
Ozizi Lewis na-emebi ihe ọhụrụ site n'ịhapụ nkọwapụta nke ion hydrogen kpamkpam. O degharịrị asịd na ntọala dabere na ikike ha nwere ịnakwere ma ọ bụ inye onyinye elektrọn abụọ. Dịka Lewis si kwuo:
1. Lewis Acid: Ụdị nke na-anabata ụzọ elektrọn.
2. Lewis Base: Ụdị nke na-enye otu elektrọn.
Echiche a nke lekwasịrị anya na elektrọn-pair na-enye ohere maka nghọta dị iche iche na nke zuru oke, gụnyere ọtụtụ mmeghachi omume kemịkalụ na mmekọrịta dị iche iche.
## Ntọala Echiche nke Echiche Lewis
Lewis acids na bases na-agba gburugburu echiche nke electron pairs. Electrons, ndị dị n'ime atom na molekul orbitals, nwere ike ịkekọrịta, nye, ma ọ bụ nabata, na-eme ntọala nke njikọ kemịkalụ. Lewis acid, nke nwere orbital efu, na-achọ electron pair iji nweta nhazi kwụsiri ike, ebe Lewis base, nke nwere naanị pair, nwere ike inye electrons ndị a.
### Nchọpụta na Ihe Nlereanya nke Lewis Acids na Bases
1. Lewis Acids:
– Kationị ígwè: ion ígwè mgbanwe dịka Fe³⁺ na Cu²⁺ bụ ezigbo asịd Lewis n'ihi na ha nwere orbitals efu nke nwere ike ịnabata ụzọ elektrọn abụọ.
– Mkpụrụ ndụ ndị na-enweghị elektrọn: Mkpụrụ ndụ ndị dị ka Boron trifluoride (BF₃) na aluminom chloride (AlCl₃), nke nwere octet na-ezughị ezu, na-arụ ọrụ dị ka asịd Lewis. Ụdị ndị a na-achọsi ike inweta onyinye elektrọn abụọ iji mezue shei valence ha.
– Molekụlụ nwere njikọ Polarisable: Carbon dioxide (CO₂) bụ ihe atụ ọzọ a ma ama. Atọm carbon, ebe ọ bụ na ọ na-enwe electrophilic, nwere ike ịnabata ụzọ abụọ elektrọn site na ntọala.
2. Lewis Bases:
– Anion: Ion ndị nwere chajị na-adịghị mma dịka hydroxide (OH⁻), fluoride (F⁻), na chloride (Cl⁻) bụ ihe ndị Lewis na-ahụkarị n'ihi na ha na-enye otu n'ime ha ozugbo.
– Mkpụrụ ndụ ndị na-anọpụ iche nwere otu ụzọ abụọ: Ammonia (NH₃) na phosphine (PH₃), nke nwere otu ụzọ abụọ nke elektrọn, na-arụ ọrụ nke ọma dị ka ntọala Lewis.
– Njikọ π nke bara ọgaranya na electron: Mkpụrụ ndụ dịka benzene, nwere mgbaaka aromatic bara ụba na electron, nwekwara ike ịrụ ọrụ dị ka ntọala Lewis site n'inye π electrons.
## Ihe mgbakwunye na ihe mgbagwoju anya nke Lewis Acid-Base
Mgbe Lewis acid meghachiri omume na ntọala Lewis, ha na-emepụta ihe a maara dị ka adduct ma ọ bụ ihe mgbagwoju anya. A na-egosipụtakarị mmekọrịta a dị ka:
\[ \text{Acid} + \text{Isi} \rightarrow \text{Adduct} \]
Dịka ọmụmaatụ, tụlee mmeghachi omume dị n'etiti ammonia (isi Lewis) na boron trifluoride (asịd Lewis):
\[ \ederede{NH}_3 + \ederede{BF}_3 \ederede{rightarrow \ederede{H}_3\ederede{N-BF}_3 \]
Mkpụrụ ndụ ammonia na-enye nanị otu ụzọ ya nye atọm boron nke na-enweghị elektrọn dị na boron trifluoride, wee mepụta Lewis adduct kwụsiri ike.
## Ngwa na Mkpa
Ike dị n'ezie nke ozizi Lewis dị n'ọtụtụ ihe dị iche iche na nghọta miri emi ọ na-enye n'ọtụtụ ngalaba kemistri dị iche iche:
1. Ngụkọta: Ọtụtụ usoro ngụkọta, ọkachasị na kemistri organic na organometallic, dabere na mmekọrịta Lewis acid na isi. Dịka ọmụmaatụ, na Friedel-Crafts alkylation, aluminum chloride (AlCl₃) na-arụ ọrụ dị ka Lewis acid iji mee ka nhazi nke ihe ndị na-eme ka carbohydrate na-arụ ọrụ dị mfe.
2. Kemistri Nhazi: Ozizi a dị mkpa n'ịghọta nhazi nke mgbagwoju anya nhazi. ion metal transition, na-arụ ọrụ dị ka Lewis acids, na-ejikọta ya na ligands, nke na-eje ozi dị ka ntọala Lewis. Ngwakọta nhazi ndị a na-enweta nwere oke mkpa na kemistri bioinorganic, sayensị ihe, na catalysis.
3. Ịkwụsi Ike nke Ụdị Mmeghachi Omume: Ọtụtụ ihe ndị na-emeghachi omume na-eme ka ha kwụsie ike site na mmekọrịta Lewis-acid-base. Dịka ọmụmaatụ, enwere ike ime ka carbene kwụsie ike site na iji Lewis acid mee ihe, si otú a na-eme ka uru ha bara na kemistri sịntetik dịkwuo mma.
4. Ịghọta Usoro Mmeghachi Omume: Ozizi Lewis na-enye nkọwa doro anya gbasara ike eletrọniki nke ọtụtụ mmeghachi omume, na-akọwa ihe kpatara ụfọdụ substrates ji emeghachi omume karịa ma ọ bụ ihe kpatara njikọta ụfọdụ nke isi ihe na-akpali akpali ji enye nsonaazụ kacha mma.
## Ịgbasapụ Karịa Ókè Omenala
Ozizi Lewis gafere mmekọrịta dị mfe nke molekul, na-agbasa ruo n'ókè nke kemistri siri ike na sayensị ihe. Mmekọrịta isi-acid na-akwado omume nke zeolites, ihe ndị e ji akwa kpuchie, na usoro metal-organic (MOFs), na-akọwapụta njirimara catalytic, adsorptive, na ion-exchange ha.
### Omume Isi-Acid na Ngwọta Na-abụghị Mmiri
N'ime ihe mgbaze na-abụghị mmiri, nkọwa ọdịnala anaghị adị irè, mana echiche Lewis ka siri ike. Dịka ọmụmaatụ, na ammonia na-anaghị amịpụta mmiri, nkọwa proton ọdịnala anaghịzi arụpụta ihe, mana mmekọrịta Lewis-base-base ka dị irè n'ịkọwa ihe ngwọta na mmeghachi omume.
## Mmachi na Nkatọ Nwere Ike Ime
Ọ bụ ezie na ozizi Lewis na-enye ohere sara mbara maka ojiji, ọ bụghị na-enweghị oke. Ọ na-elekwasị anya na ụzọ elektrọn ma si otú a nwee ike ileghara ihe ndị dị na mmekọrịta proton kpọmkwem anya. Ụfọdụ ihe ndị dị na acid-base, karịsịa ndị jikọtara ya na nnyefe proton nke ọma, nwere ike ịkọwa nke ọma site na ozizi Brønsted-Lowry. Na mgbakwunye, ike nke mmekọrịta acid-base na usoro Lewis nwere ike ịdabere na ihe dị na ya, na-agbanwe agbanwe na gburugburu molekul na geometries kpọmkwem.
## Mmechi
Ozizi Lewis nke asịd na ntọala bụ isi ihe dị mkpa n'echiche kemịkalụ nke oge a. Site n'ịgbasa nkọwa ahụ ịgụnye mmekọrịta elektrọn abụọ, ọ na-enye nkọwa dị n'otu n'ọtụtụ ọnọdụ kemịkalụ, site na ngwọta mmiri dị mfe ruo na usoro catalytic dị mgbagwoju anya na ihe ndị siri ike. N'agbanyeghị oke mgbe ụfọdụ, nkwụsi ike na oke sara mbara nke ozizi Lewis na-emesi ike ihe nketa ya na-adịgide adịgide na panorama nke sayensị kemịkalụ, na-aga n'ihu na-akpali ma na-akọwapụta egwu eletrọniki nke atọm na molekul n'ụwa kemistri na-agbanwe agbanwe mgbe niile.
