Wɔasan ahwɛ asɛm yi mu sɛnea Science X samufo nhyehyɛe ne nhyehyɛe ahorow kyerɛ. Nsɛm ho amanneɛbɔfo no asi su ahorow a edidi so yi so dua bere a wɔhwɛ hu sɛ emu nsɛm no yɛ nokware no:
Wim nsakrae yɛ wiase nyinaa nneɛma a atwa yɛn ho ahyia ho haw. Ade titiriw a ɛde wim nsakrae ba ne pɛtro a efi abo mu a wɔhyew dodo. Wɔyɛ carbon dioxide (CO2), mframa a ɛma wim yɛ hyew a ɛboa ma wiase nyinaa yɛ hyew. Esiane eyi nti, nniso ahorow a ɛwɔ wiase nyinaa reyɛ nhyehyɛe ahorow a wɔde bɛto mframa bɔne a ɛte saa a wɔtow gu no ano. Nanso, ebia carbon a wɔtew so ara kwa no rennɔɔso. Ɛsɛ sɛ wɔhwɛ mframa bɔne a wɔtow gu no nso so. googletag.cmd.push (adwuma () { googletag.dakyerɛ ('div-gpt-ad-1449240174198-2 '); });
Wɔ eyi mu no, nyansahufo hyɛ nyansa sɛ wɔmfa nnuru nsakra carbon dioxide ma ɛbɛyɛ nneɛma a ɛsom bo te sɛ methanol ne formic acid (HCOOH). Sɛ wobetumi ayɛ nea etwa to no a, ɛho hia sɛ wonya hydride ions (H-) a ɛne proton biako ne ɛlɛtrɔnik abien yɛ pɛ fibea. Sɛ nhwɛso no, nicotinamide adenine dinucleotide (NAD+/NADH) a ɛyɛ reduction-oxidation pair no yɛ hydride (H-) a ɛma anyinam ahoɔden ne nea ɛkora so wɔ abɔde a nkwa wom nhyehyɛe ahorow mu.
Wɔ saa tebea yi mu no, nhwehwɛmufo kuw bi a Ɔbenfo Hitoshi Tamiaki a ofi Ritsumeikan Sukuupɔn, Japan, di wɔn anim yɛɛ nnuru kwan foforo bi a wɔde NAD+/NADH a ɛte sɛ ruthenium a ɛyɛ den dii dwuma de tew CO2 so ma ɛbɛyɛ HCOOH. Wɔtintim wɔn nhwehwɛmu no mu aba wɔ nsɛmma nhoma ChemSusChem mu wɔ Ɔbɛnem 13, 2023.
Ɔbenfo Tamiaki kyerɛkyerɛ nea ɛkanyan no ma ɔyɛɛ nhwehwɛmu no mu. "Nnansa yi ara wɔkyerɛe sɛ ruthenium complex a ɛwɔ NAD + nhwɛso no, [Ru(bpy)2(pbn)](PF6)2, no fa photochemical two-electron reduction. Ɛmaa NADH type complex a ɛne no hyia [Ru (bpy) )2 (pbnHH)](PF6)2 bae wɔ triethanolamine anim wɔ acetonitrile (CH3CN) mu wɔ hann a wotumi hu ase," ɔkaa saa.
"Nea ɛka ho no, sɛ wɔde CO2 bubbling kɔ [Ru(bpy)2(pbnHH)]2+ solution mu a, ɛma [Ru(bpy)2(pbn)]2+ san yɛ foforo na ɛma formate ions (HCOO-) ba. Nanso, ahoɔhare a ɛde yɛ no sua koraa. Tiatiaa. Enti, sɛ wɔdan H- ma ɛbɛyɛ CO2 a, ɛhwehwɛ sɛ wɔyɛ nhyehyɛe a ɛma nneɛma yɛ kɛse a ɛkɔ anim."
Enti, nhwehwɛmufo ayɛ nhwehwɛmu wɔ nneɛma ahorow a wɔde yɛ nneɛma ne tebea horow a ɛma nneɛma yɛ adwuma a ɛboa ma mframa bɔne a wɔtow gu no so tew mu. Wogyinaa saa nhwehwɛmu ahorow yi so de nyansahyɛ mae sɛ hann a ɛma ɛlɛtrɔnik abien tew redox baanu [Ru(bpy)2(pbn)]2+/[Ru(bpy)2(pbnHH)]2+ so wɔ 1, 3- anim. Dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole (BIH) a wɔde di dwuma. Bio nso, nsu (H2O) a ɛwɔ CH3CN mu sen sɛ wɔde triethanolamine bɛhyɛ mu no maa aba no yɛɛ yiye bio.

Bio nso, nhwehwɛmufoɔ no nso de akwan te sɛ nuklea magnetic resonance, cyclic voltammetry ne UV-visible spectrophotometry hwehwɛɛ akwan a ɛbɛtumi ayɛ adwuma. Wogyinaa eyi so susuwii sɛ: Nea edi kan no, bere a [Ru(bpy)2(pbn)]2+ no photoexcitation so no, free radical [RuIII(bpy)2(pbn•-)]2+* no ba, a ɛso tew a edidi so yi: BIH Get [RuII(bpy)2(pbn•-)]2+ ne BIH•+. Akyiri yi, H2O de protonate ruthenium complex no ma ɛyɛ [Ru(bpy)2(pbnH•)]2+ ne BI•. Adeɛ a ɛfiri mu ba no yɛ disproportionated ma ɛyɛ [Ru(bpy)2(pbnHH)]2+ na ɛsan kɔ [Ru(bpy)2(pbn)]2+. Afei wɔde BI• tew kan no so ma ɛyɛ [Ru(bpy)(bpy•−)(pbnHH)]+. Saa ade a ɛyɛ den yi yɛ ade a ɛma nneɛma yɛ adwuma a ɛdannan H- ma ɛbɛyɛ CO2, na ɛma HCOO- ne formic acid ba.
Nhwehwɛmufoɔ no kyerɛɛ sɛ adeyɛ a wɔahyɛ ho nyansa no wɔ nsakraeɛ dodoɔ a ɛkorɔn (carbon dioxide mole dodoɔ a ɛnam catalyst mole baako so dane) – 63.
Nhwehwɛmufo no ani agye saa nneɛma a wɔahu yi ho na wɔwɔ anidaso sɛ wɔbɛyɛ ɔkwan foforo a wɔbɛfa so adan ahoɔden (owia hann ayɛ no nnuru ahoɔden) de ayɛ nneɛma foforo a wɔyɛ no foforo.
Ɔbenfo Tamiaki de kaa ho sɛ: “Yɛn kwan no nso bɛtew carbon dioxide dodow a ɛwɔ Asase so nyinaa so na aboa ma carbon kyinhyia no akɔ so atra hɔ.Enti, ebetumi atew wiase nyinaa hyew a ɛbɛba daakye no so.” “Nea ɛka ho no, mfiridwuma foforo a wɔde fa organic hydride so bɛma yɛanya nneɛma a ɛsom bo kɛse.”
Nsɛm foforɔ: Yusuke Kinoshita ne ne mfɛfoɔ, Hann-a ɛma organic hydride transfer kɔ CO2 ** a ruthenium complexes yɛ ntamgyinafoɔ sɛ nhwɛsoɔ ma NAD + / NADH redox awarefoɔ, ChemSusChem (2023). DOI: 10.1002/cssc.202300032. Nsɛm a wɔahyehyɛ

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