Ekihandiiko eki kishwijumirwe kurugiirira aha nkora n’ebiragiro bya Science X eby’okuhandiika. Abahandiiki bakahamya emitwarize egi obwo barikuhamya oburingaaniza bw’ebirimu:
Empindahinduka y’obwire n’ekizibu ky’eby’obuhangwa omu nsi yoona. Ekikuru ekirikureetaho empindahinduka y'obwire n'okwotsya munonga amajuta g'ebishaka. Birareeta omwika gwa kabonidayoksayidi (CO2), omuyaga ogurikwatsa obutagatsi bwensi yoona. Ahabw’eki, gavumenti z’ensi yoona nizikora ebiragiro by’okukyendeeza aha nshobi nk’ezo. Kwonka okukyendeeza aha nshaho y’omuyaga nikibaasa kutamara. Ebirikuruga omu mwanya nabyo nibyetenga kukyeberwa. 1449240174198-2′); });
Omu nshonga egi, abanyasayansi nibateekateeka ngu emibazi ehindurwe omuyaga gwa kaboni guhinduke ebirungo ebirikwongera omuhendo nka methanol na formic acid (HCOOH). Okubaasa kureetaho eky’aha muheru, nikyetengyesa entandikwa ya ayoni za hydride (H-), ezirikwingana na purotoni emwe na elekitironi ibiri. Nk‘eky‘okureeberaho, omubaro gw‘okukyendeeza-okuhindura ebiriisa bya nicotinamide adenine dinucleotide (NAD+/NADH) n‘ekirikureetaho n‘ekibiikiro ky‘amaizi (H-) omu nkora z‘ebihangirwe.
Omu nshonga egi, ekibiina ky’abacondoozi ekirikwebemberwa Purofeesa Hitoshi Tamiaki kuruga omu yunivasite ya Ritsumeikan, Japan, bakakora omuringo musya gw’eby’emibazi barikukoresa ebirungo bya NAD+/NADH ebirikushushana na ruthenium kukyendeeza CO2 kuhika ahari HCOOH. Ebyarugire omu kucondooza kwabo bikashohozibwa omu jano ChemSusChem ebiro 13 Okwamwenda 2023.
Purofeesa Tamiaki naashoboorora ekyamureeteire kukora okucondooza kwe. “Kikareebeka juba ngu ekirungo kya ruthenium ekiine omuringo gwa NAD+, [Ru(bpy)2(pbn)](PF6)2, nikitunga okukyendeeza kw’eby’obuhangwa bibiri. (CH3CN) ahansi y’omushana ogurikureebwa,” nikwo agizire.
“Okwongyera ahari ekyo, okubumba CO2 omu [Ru(bpy)2(pbnHH)]2+ omubazi nikigaruraho [Ru(bpy)2(pbn)]2+ kandi kireetaho ions za formate (HCOO-). Kwonka, omuvuyo gwayo gw’okukora nigukye munonga.
Nahabwekyo, abacondoozi bacondoozire aha bintu bitari bimwe na bimwe ebirikukora n’embeera z’okukora ebirikuhwera kukyendeeza aha nshaho y’omwika ogurikwetwa carbon dioxide. Okurugirira aha kucondooza oku, bakateekateeka ngu omushana nigubaasa kukyendeeza aha nkora ya redox [Ru(bpy)2(pbn)]2+/[Ru(bpy)2(pbnHH)]2+ omu kubaho kwa 1, 3-. Omubazi gw’okukyebera amaizi g’omubiri (BIH). Okwongyera ahari ekyo, amaizi (H2O) omu CH3CN omu mwanya gwa triethanolamine gakongyera kutunguura ebiriisa.

Okwongyera ahari ekyo, abacondoozi bakacondooza n’aha miringo erikubaasa kugarukamu barikukoresa obukoryo nk’okupima amashanyarazi g’omubiri, okupima amashanyarazi g’omubiri (cyclic voltammetry) n’okupima amashanyarazi g’omubiri (UV-visible spectrophotometry). Okurugirira ahari eki, bakateekateeka ngu: Eky’okubanza, aha kujwara [Ru(bpy)2(pbn)]2+, ekicweka ky’omubiri ekiine obugabe [RuIII(bpy)2(pbn•-)]2+* nikihangwa, ekirikuraba omu kukyendeera oku: BIH Tunga [RuII(bpy)2(pbn•+) Okurugirira ahari ekyo, H2O neekora purotoni omu nkora ya ruthenium kubaasa kuhanga [Ru(bpy)2(pbnH•)]2+ na BI•. Ekirugiremu nikiba kitarikushushana kubaasa kuhanga [Ru(bpy)2(pbnHH)]2+ kandi kigaruka omu [Ru(bpy)2(pbn)]2+. Eky’okubanza bwanyima nikikyendeezibwa BI• kureetaho [Ru(bpy)(bpy•−)(pbnHH)]+. Ekizibu eki n’ekintu ekirikukora ekirikuhindura H- kuba CO2, kikareetaho HCOO- na formic acid.
Abacondoozi boorekire ngu enkora erikuteekateekwaho eine omubaro gw’okuhindura gw’ahaiguru (omubaro gw’ebicweka bya carbon dioxide ebirikuhindurwa mole emwe y’ekirikureetaho) – 63.
Abacondoozi aba bashemereirwe ahabw’ebi baashangire kandi baine amatsiko g’okukora omuringo musya gw’okuhindura amaani (omushana gw’eizooba kuba amaani g’eby’obuhangwa) kubaasa kuhanga ebintu bisya ebirikugarukaho.
"Omuringo gwaitu nigwija n'okukyendeeza aha mubaro gwona ogw'omwika ogurikwetwa carbon dioxide omunsi kandi guhwere omu kuguma n'enkora ya carbon dioxide. Nahabwekyo, nigubaasa kukyendeeza okutagata kw'ensi omu biro by'omumaisho," Purofeesa Tamiaki yayongyeraho. “Okwongyera ahari ekyo, tekinologiya nsya y’okutwara ebintu ebirikwetwa organic hydride neija kutuha ebirungo by’omuhendo munonga.”
Ebindi: Yusuke Kinoshita na bagyenzi be, Okuhindura kw‘omubiri okurikureetwaho omushana kuza omu CO2** okurikutaaha omu nkora ahabw‘ebirungo bya ruthenium nk‘eky‘okureeberaho ky‘abakundaine ba NAD+/NADH redox, ChemSusChem (2023). DOI: 10.1002/202300032

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