Defects on a pyrite(100) surface produce chemical evolution of glycine under inert conditions: experimental and theoretical approaches

Abstract

The presence of non-stoichiometric sites on the pyrite(100) surface makes it a suitable substrate for driving the chemical evolution of the amino acid glycine over time, even under inert conditions.

Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids

“…In our experiments, the fact that the fragmentation of the glycine molecule (mainly driven by decarboxylation) and the increment of the NH 2 / NH 3 ratio are more noteworthy in the acid-treated sample, might also indicate that glycine photodegradation produces an enrichment of amino-rich moieties over the samples, as previously suggested by Tzvetkov et al 44 . However, we cannot rule out other chemical mechanisms such as the conversion of the zwitterions into neutral molecules due to charge transfer reactions 60 .…”

Interaction of chiral l-dialanine with Cu(100)

“…Furthermore, as a way of clarifying the possible substrate role in the polymerization process, intermolecular bonding, for example, intermolecular H-bonds forming chains in the direction [ 1% 30] of Cu(100), has also been analysed. 9,14 Whereas studying the simplest amino acids has been common practice, 17 there has been much less work on short peptides behaviour although the latter are most relevant to the building of more complex structures like proteins. 18,19 We are interested in the polymerization of L-alanine to form L-dialanine as a first step towards the formation of longer chiral peptide chains.…”

“…Whereas studying the simplest amino acids has been common practice, 17 there has been much less work on short peptides behaviour although the latter are most relevant to the building of more complex structures like proteins. 18,19 We are interested in the polymerization of l -alanine to form l -dialanine as a first step towards the formation of longer chiral peptide chains.…”

Exploring the Evolution Mechanism of Sulfur Vacancies by Investigating the Role of Vacancy Defects in the Interaction between H2S and the FeS(001) Surface

“…The existence of vacancy defects has a considerable effect on the reactivity of a surface . For instance, the presence of S vacancies on the pyrite(100) surface not only promoted the adsorption of formamide but also facilitated the transition of amino acid from a zwitterionic species to an anionic species. , Sahraei et al found that the vacancy defects on the ZnS(110) surface can change the hydrophilicity of the surface and also prompt the conversion of amino acid from neutral to zwitterionic. , Ward et al revealed that pure FeS could be described by FeS 0.94 . Furthermore, crystallographic evidence found by Taylor and Finger et al confirmed that FeS was sulfur-deficient (FeS 1– x , typically 0 ≤ x ≤ 0.07) .…”