Tetraazamacrocycles, like cyclam , are well-studied polyamine ligands for metal ions that were first developed to model biological processes. Despite being studied for nearly 60 years, the development of chiral variants of has been limited. We report the synthesis of a chiral variant of , the tetraazamacrocycle . Outlined herein are the synthesis of , a preliminary study of its complexation with metal ions, and the properties of the resulting metal complexes.
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http://dx.doi.org/10.1021/acs.joc.1c00223 | DOI Listing |
J Phys Chem Lett
January 2025
Kenneth S. Pitzer Theory Center and Department of Chemistry, University of California, Berkeley, California 94720, United States.
This work constructs an advanced force field, the Completely Multipolar Model (CMM), to quantitatively reproduce each term of an energy decomposition analysis (EDA) for aqueous solvated alkali metal cations and halide anions and their ion pairings. We find that all individual EDA terms remain well-approximated in the CMM for ion-water and ion-ion interactions, except for polarization, which shows errors due to the partial covalency of ion interactions near their equilibrium. We quantify the onset of the dative bonding regime by examining the change in molecular polarizability and Mayer bond indices as a function of distance, showing that partial covalency manifests by breaking the symmetry of atomic polarizabilities while strongly damping them at short-range.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Physics, K.S.M Devaswom Board College, Sasthamcotta, Kollam, India.
Transition metal based optical limiting materials have garnered significant attention due their crucial role in protecting sensitive optical system from high intense laser damage. Transition metal molybdates exhibits nonlinear optical (NLO) response, which attenuate highly intense light by transmitting light of desired intensity. Herein we report Silver molybdate (AgMoO) nanostructures doped with erbium (Er) ions were successfully synthesized by simple co-precipitation technique.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Electronic address:
With increasing global environmental awareness and concerns about food safety, biodegradable active packaging has garnered widespread attention. In this study, the stability and bioactivity of tea polyphenol (TP) were enhanced through the preparation of TP-ferric nanoparticles (TP-Fe NPs) using metal-polyphenol ion coordination. Moreover, the introduction of Fe ions can further enhance the antibacterial effects of NPs.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Department of Biochemistry, Memorial University of Newfoundland, 45 Arctic Avenue, St. John's, Newfoundland and Labrador, Canada. Electronic address:
d-ribose is a critical sugar substrate involved in the biosynthesis of nucleotides, amino acids, and cofactors, with its phosphorylation to ribose-5-phosphate by ribokinase (RK) constituting the initial step in its metabolism. RK is conserved across all domains of life, and its activity is significantly enhanced by monovalent metal (M) ions, particularly K, although the precise mechanism of this activation remains unclear. In this study, we present several crystal structures of human RK in both unliganded and substrate-bound states, offering detailed insights into its substrate binding process, reaction mechanism, and conformational changes throughout the catalytic cycle.
View Article and Find Full Text PDFBiosens Bioelectron
January 2025
Liaoning Province Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang, 110036, PR China; School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, PR Singapore. Electronic address:
Array-based analysis allows for precise disease diagnosis by simultaneously detecting multiple biomarkers. However, most array sensing platforms rely on non-covalent interactions between sensors and analytes, which limits their sensitivity. This study enhances the sensitivity of array analysis for thiol biomarkers by incorporating polyion complex micelles into the sensor array design.
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