Study of Ferrocyanide Adsorption onto Different Minerals as Prebiotic Chemistry Assays

• DOI: 10.1089/ast.2020.2322
• Publication Date: 2021-09-17T20:04:15Z
• Authors: Rafael Block Samu...; Bruno Estevam Pintor; Flávio F. Ivashita; Andrea Paesano; Dimas Augusto Mor...
• Keywords: Prussian blue; Ferrocyanide; Abiogenesis; Ferricyanide

Considered one of the most promising building blocks life on primitive Earth, cyanide and its complexes are likely to have played an important role in emergence planet. Investigation into Earth has primarily considered high concentrations, but concentration oceans prebiotic was exceptionally low. Thus, Bernal's hypothesis allowed investigators work around this problem. We observed, however, that does not adsorb onto several minerals; therefore, ferrocyanide could be used as a source when adsorbed mineral surfaces promote synthesis molecules biological significance. When bentonite, Fe3+ atoms interlayers, formation Prussian blue analog occurs through endothermic reaction with increased entropy. The adsorption kaolinite indicates exothermic outer-sphere interaction, which results degeneracy breakdown for C ≡ N stretch energy two new bands FTIR-ATR spectrum. Magnetite, iron structure, interactions been observed by coordination well analogs, confirmed appearance doublet Mössbauer spectra broadband close 750 nm at UV-visible spectroscopy. Magnetite experiments presented relevant only performed seawater, suggests importance seawater composition experiments. These obtained prove interacts minerals differently according structure show complex, like may crucial Earth.