SO2 capture by tricyanomethanide ionic liquids: Unraveling anion-gas interactions by resonance Raman spectroscopy

Autor(es)

Morselli, Giovanni R. ^[1] ; Ando, Romulo A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Lab Espectroscopia Mol, USP, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemical Physics Letters; v. 784, DEC 2021.
• Citações Web of Science: 0

Resumo

Interactions concerning the high SO2 absorption capacity in 1-butyl-3-methyilimidazolium tricyanomethanide (BMITCM) were analyzed through Raman spectroscopy. The SO2 symmetric stretching band, nu(s)(SO2), remained equal in shape and wavenumber regardless the SO2 molar fraction, suggesting no specific interaction between TCM and SO2. However, by increasing the Raman excitation energy from 568 to 405 nm, a pre-resonance condition was reached, where a shifting and broadening of nu(s)(SO2) is noticed. Such results evidence solvation states where charge transfer interactions between TCM and SO2 prevail, corroborating the high absorption capacity of TCM based ionic liquids. (AU)

• Processo FAPESP: 16/21070-5 - Espectroscopia vibracional com resolução espacial
• Beneficiário: Mauro Carlos Costa Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático