Dinuclear uranium(vi) salen coordination compound: an efficient visible-light-active catalyst for selective reduction of CO2 to methanol. Issue 47 (17th November 2020)

• Record Type: Journal Article
• Authors: Azam, Mohammad; Kumar, Umesh; Olowoyo, Joshua O.; Al-Resayes, Saud I.; Trzesowska-Kruszynska, Agata; Kruszynski, Rafal; Islam, Mohammad Shahidul; Khan, Mohammad Rizwan; Adil, S. F.; Siddiqui, Mohammad Rafique; Al-Harthi, Fahad Ahmed; Alinzi, Abdul Karim; Wabaidur, Saikh Mohammad; Siddiqui, Masoom Raza; Shaik, Mohammed Rafi; Jain, Suman L.; Farkhondehfal, M. Amin; Hernàndez, Simelys
• Is Part Of: Dalton transactions. Volume 49:Issue 47(2020)
• Page Start: 17243
• Page End: 17251
• Publication Date: 2020-11-17
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt02620d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The newly synthesized dinuclear uranyl salen coordination compound showed excellent photocatalytic reduction of CO2 to methanol. Abstract : A new dinuclear uranyl salen coordination compound, [(UO2 )2 (L)2 ]·2MeCN [L = 6, 6′-((1 E, 1′ E )-((2, 2-dimethylpropane-1, 3-diyl)bis(azaneylylidene))-bis(methaneylylidene))bis(2-methoxyphenol)], was synthesized using a multifunctional salen ligand to harvest visible light for the selective photocatalytic reduction of CO2 to MeOH. The assembling of the two U centers into one coordination moiety via a chelating–bridging doubly deprotonated tetradentate ligand allowed the formation of U centers with distorted pentagonal bipyramid geometry. Such construction of compounds leads to excellent activity for the photocatalytic reduction of CO2, permitting a production rate of 1.29 mmol g −1 h −1 of MeOH with an apparent quantum yield of 18%. Triethanolamine (TEOA) was used as a sacrificial electron donor to carry out the photocatalytic reduction of CO2 . The selective methanol formation was purely a photocatalytic phenomenon and confirmed using isotopically labeled 13 CO2 and product analysis by 13 C-NMR spectroscopy. The spectroscopic studies also confirmed the interaction of CO2 with the molecule of the title complex. The results of these efforts made it possible to understand the reaction mechanism using ESI–mass spectrometry.