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Mn-Mn Dimers Induced Multimode Emitters in Mn-Activated AZn(PO) (A = K, Rb, and Cs) with Unique [ZnPO] Chains and [ZnO] Groups.
Inorg Chem
January 2025
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China.
Mn-doped luminescent materials play a significant role in a variety of fields, including modern lighting, displays, and imaging. Mn exhibits a broad and adjustable emission, hinging on the local environment of the crystal field and the interaction of the 3d electrons. However, it is still a challenge to realize the precise control of the emission of Mn ions due to site-prior occupation in a specific lattice.
View Article and Find Full Text PDFChemical Logic of Peptide Branching by Iterative Nonlinear Nonribosomal Peptide Synthetases.
Biochemistry
January 2025
Department of Chemistry, Washington University in St. Louis, One Brookings Drive, St. Louis, Missouri 63130, United States.
Branch-point syntheses in nonribosomal peptide assembly are rare but useful strategies to generate tripodal peptides with advantageous hexadentate iron-chelating capabilities, as seen in siderophores. However, the chemical logic underlying the peptide branching by nonribosomal peptide synthetase (NRPS) often remains complex and elusive. Here, we review the common strategies for the biosynthesis of branched nonribosomal peptides (NRPs) and present our biochemical investigation on the NRPS-catalyzed assembly of fimsbactin A, a branched mixed-ligand siderophore produced by the human pathogenic strain .
View Article and Find Full Text PDFModulation of the modulated magnetic structure of an Ho i-MAX phase described by a magnetic (3+2)-dimensional superspace group.
Acta Crystallogr B Struct Sci Cryst Eng Mater
February 2025
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 18200 Praha 8, Czechia.
The magnetic structures of the Ho-based i-MAX phase (MoHo)GaC were studied with neutron powder diffraction at low temperature. (MoHo)GaC crystallizes in the orthorhombic space group Cmcm. The material undergoes two successive antiferromagnetic transitions at T = 10 K and T = 7.
View Article and Find Full Text PDFNanomachine Networks: Functional All-Enzyme Hydrogels from Photochemical Cross-Linking of Glucose Oxidase.
Biomacromolecules
January 2025
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K.
Enzymes are attractive as catalysts due to their specificity and biocompatibility; however, their use in industrial and biomedical applications is limited by stability. Here, we present a facile approach for enzyme immobilization within "all-enzyme" hydrogels by forming photochemical covalent cross-links between the enzyme glucose oxidase. We demonstrate that the mechanical properties of the enzyme hydrogel can be tuned with enzyme concentration and the data suggests that the dimeric nature of glucose oxidase results in unusual gel formation behavior which suggests a degree of forced induced dimer dissociation and unfolding.
View Article and Find Full Text PDFEnantiocontrolled Cyclization to Form Chiral 7- and 8-Membered Rings Unified by the Same Catalyst Operating with Different Mechanisms.
J Am Chem Soc
January 2025
Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
Chiral medium-sized rings, albeit displaying attractive properties for drug development, suffer from numerous synthetic challenges due to difficult cyclization steps that must take place to form these unusually strained, atropisomeric rings from sterically crowded precursors. In fact, catalytic enantioselective cyclization methods for the formation of chiral seven-membered rings are unknown, and the corresponding eight-membered variants are also sparse. In this work, we present a substrate preorganization-based, enantioselective, organocatalytic strategy to construct seven- and eight-membered rings featuring chirality that is intrinsic to the ring in the absence of singular stereogenic atoms or single bond axes of chirality.
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