New Platinum Complexes from Salen- and Hydroxy-Substituted Salpn-Naphthalene Ligands with CO2 Reduction Activity

The electrocatalytic reduction of carbon dioxide (CO2) into added-value products is a promising alternative to completing the cycle of atmospheric CO2. We report two new platinum complexes—a salen-like naphthalene (PtL1) and a hydroxy-substituted salpn naphthalene (PtL2)—that are capable of activati...

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Bibliographic Details
Published in:Catalysts 2023-05, Vol.13 (5), p.911
Main Authors: Rivera-Reyes, Javier O., Soto-Pérez, Joesene, Sepulveda-Pagán, Miguel, Lu, Linguo, Borrero-Negrón, Justin, Luna-Ramírez, Alanys V., Trinidad-Pérez, Pedro, Pagán-Torres, Yomaira, Chen, Zhongfang, Cabrera, Carlos R., West, William C., Jones, John-Paul, Piñero Cruz, Dalice M.
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
Alternative energy
Carbon dioxide
Carbon monoxide
Catalysts
Chemical reactions
Chemical reduction
Climate change
CO2 utilization
DFT calculations
electrocatalysis
Geometry
Hydrogen bonds
Ligands
Metals
Naphthalene
Platinum
Protons
Schiff-base
Substitutes
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Summary:The electrocatalytic reduction of carbon dioxide (CO2) into added-value products is a promising alternative to completing the cycle of atmospheric CO2. We report two new platinum complexes—a salen-like naphthalene (PtL1) and a hydroxy-substituted salpn naphthalene (PtL2)—that are capable of activating CO2 to produce carbon monoxide (CO). The predominant keto tautomer of the non-innocent ligands was determined using DFT calculations and UV-Vis spectroscopy. The PtL2 complex has a CO Faradaic efficiency >40% in the presence of water as a sacrificial proton source at −2.5 V vs. Fc/Fc+. The addition of the hydroxy group in combination with water as a proton source decreased the reduction potential and increased the CO formation tenfold when compared to PtL1.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal13050911