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Insights into the separation, enantioseparation and recognition mechanisms of methamphetamine isotopologues on achiral and polysaccharide-based chiral columns in high-performance liquid chromatography.
Anal Chim Acta
February 2025
Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, 0179, Tbilisi, Georgia. Electronic address:
Background: Isotopologues resulting from the labelling of molecules with deuterium have attracted interest due to the isotope effect observed in chemistry and biosciences. Isotope effect may also play out in noncovalent interactions and mechanisms leading to intermolecular recognition. In chromatography, differences in retention time between isotopologues, as well as between isotopomers have been observed resulting in two different elution sequences (isotope effects): the normal isotope effect when heavier isotopologues retain longer than lighter analogues, and the inverse isotope effect featuring the opposite elution order.
View Article and Find Full Text PDFA new hydrated crystalline form of -[()-(4-hy-droxy-phen-yl)methyl-idene]-1-1,2,4-triazol-3-amine and its anti-fungal activity.
Acta Crystallogr E Crystallogr Commun
January 2025
Synchrotron SOLEIL, L'Orme des Merisiers, BP48, Saint Aubin, 91192, Gif-sur-Yvette, France.
The synthesis, crystal structure, Hirshfeld analysis, and anti-fungal assessment of a new monohydrated Schiff base with a triazole moiety are reported. The structural study revealed the presence of three significant hydrogen bonds (N-H⋯N, O-H⋯N, and O-H⋯O), which contribute to the cohesion of the crystal. These bonds generate two-dimensional layers parallel to the plane, built on the basis of rings with the graph-set motifs (8) and (24).
View Article and Find Full Text PDFSolution equilibrium and redox properties of metal complexes with 2-formylpyridine guanylhydrazone derivatives: Effect of morpholine and piperazine substitutions.
J Inorg Biochem
March 2025
Department of Molecular and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7-8, H-6720 Szeged, Hungary. Electronic address:
Schiff bases derived from aminoguanidine are extensively investigated for their structural versatility. The tridentate 2-formylpyridine guanylhydrazones act as analogues of 2-formyl or 2-acetylpyridine thiosemicarbazones, where the thioamide unit is replaced by the guanidyl group. Six derivatives of 2-formylpyridine guanylhydrazone were synthesized and their proton dissociation and complex formation processes with Cu(II), Fe(II) and Fe(III) ions were studied using pH-potentiometry, UV-visible, NMR and electron paramagnetic resonance spectroscopic methods.
View Article and Find Full Text PDFDiscarded sequencing reads uncover natural variation in pest resistance in .
Elife
December 2024
Plant Evolutionary Ecology, Institute of Evolution and Ecology, University of Tübingen, Tübingen, Germany.
Understanding the genomic basis of natural variation in plant pest resistance is an important goal in plant science, but it usually requires large and labor-intensive phenotyping experiments. Here, we explored the possibility that non-target reads from plant DNA sequencing can serve as phenotyping proxies for addressing such questions. We used data from a whole-genome and -epigenome sequencing study of 207 natural lines of field pennycress () that were grown in a common environment and spontaneously colonized by aphids, mildew, and other microbes.
View Article and Find Full Text PDFDonor-free 9-aluminafluorenes: molecular structures and reactivity.
Dalton Trans
December 2024
Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, D-60438 Frankfurt, Main, Germany.
Aluminum-doped polycyclic aromatic hydrocarbons (PAHs) are underexplored despite the broad applications of boron-containing PAHs in areas such as catalysis and optoelectronics. We disclose the donor-free, sterically unprotected 9-methyl-9-aluminafluorene (Me-AlFlu; 2), synthesized by heating a 9,9-dimethyl-9-stannafluorene and AlMe in hexanes. The compound is a dimer, (2), with -positioned Al substituents in the solid state.
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