Dinuclear uranium(vi) salen coordination compound: An efficient visible-light-active catalyst for selective reduction of CO2to methanol

Mohammad Azam*, Umesh Kumar, Joshua O. Olowoyo, Saud I. Al-Resayes, Agata Trzesowska-Kruszynska, Rafal Kruszynski, Mohammad Shahidul Islam, Mohammad Rizwan Khan, S. F. Adil, Mohammad Rafique Siddiqui, Fahad Ahmed Al-Harthi, Abdul Karim Alinzi, Saikh Mohammad Wabaidur, Masoom Raza Siddiqui, Mohammed Rafi Shaik, Suman L. Jain, M. Amin Farkhondehfal, Simelys Hernàndez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A new dinuclear uranyl salen coordination compound, [(UO2)2(L)2]·2MeCN [L = 6,6′-((1E,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 13CO2 and product analysis by 13C-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.

Original languageEnglish
Pages (from-to)17243-17251
Number of pages9
JournalDalton Transactions
Volume49
Issue number47
DOIs
Publication statusPublished - 21 Dec 2020
Externally publishedYes

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