Publications by authors named "America Y Torres-Boy"
Article Synopsis
- The research focuses on understanding proton bonds, which are important in various scientific fields, by examining them at very low temperatures (around 0.4 K) to minimize thermal fluctuations.
- A proton is placed within a molecular ring cavity created by a 12-crown-4 ether, and infrared laser spectroscopy reveals narrow vibrational bands that indicate a strong proton bond across the ether sites.
- Standard modeling techniques struggle to accurately describe the observed vibrational data due to the anharmonic nature of the proton bond, highlighting the need for advanced computational methods to analyze the dynamic behavior of the crown ether at different temperatures.
The stereoselective formation of 1,2- glycosidic linkages is challenging. The currently most widely used strategy for their installation uses 4,6--benzylidene-protected building blocks. The stereoselectivity of this reaction is thought to be driven by a covalent intermediate, which reacts via an S2 mechanism.
View Article and Find Full Text PDFSialic acids are monosaccharide residues involved in several biological processes. Controlling the stereoselectivity of sialylation reactions is challenging and mechanistic studies on the structure of its intermediate, the sialyl cation, are scarce. Here it is shown that a sialyl cation can be generated and isolated from an ionized sialic acid precursor.
View Article and Find Full Text PDFStudying the Intrinsic Reactivity of Chromanes by Gas-Phase Infrared Spectroscopy.
J Am Soc Mass Spectrom
August 2024
Article Synopsis
- Tandem mass spectrometry is used to analyze the structures of organic molecules, but there's often confusion due to multiple possible structures for the same mass measurement.
- Researchers combined mass spectrometry with high-resolution infrared spectroscopy and computational chemistry to clarify the structures and fragmentation mechanisms of Trolox and Methyltrolox.
- They found that while protonated variants of these molecules fragment in similar ways, the deprotonated versions exhibit distinct reactivities, including unexpected radical fragmentation, contributing to a deeper understanding of molecule behaviors based on their protonation state.
Article Synopsis
- Understanding proton-bound complexes is important for grasping chemical reactivity and molecular interactions.
- This study focuses on the complex formed between dihydrogen phosphate and formate, using IR action spectroscopy in helium droplets.
- Findings reveal that contrary to expectations, protons are primarily located in the phosphate, and dynamics in partially deuterated complexes lead to changes in structure when IR light is applied.
Infrared Spectroscopy of Fluorenyl Cations at Cryogenic Temperatures.
J Phys Chem Lett
December 2023
The notion of (anti)aromaticity is a successful concept in chemistry to explain the structure and stability of polycyclic hydrocarbons. Cyclopentadienyl and fluorenyl cations are among the most studied classical antiaromatic systems. In this work, fluorenyl cations are investigated by high-resolution gas-phase infrared spectroscopy in helium droplets.
View Article and Find Full Text PDFThe rotationally resolved electronic spectra of the origin bands of 3-cyanoindole, 3-cyanoindole(d1), and the 3-cyanoindole-(H2O)1 cluster have been measured and analyzed using evolutionary algorithms. For the monomer, permanent dipole moments of 5.90 D for the ground state, and of 5.
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