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Exploring the Use of Pseudosymmetry in the Design of Higher-Symmetry Crystals of Racemic Compounds.
Cryst Growth Des
December 2024
Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States.
Organometallic antimony(V) complexes were prepared as model compounds to better understand the interactions of chiral chelating diols with this metalloid. These complexes feature three aryl groups (-xylyl or -tolyl) and a bidentate -2,3-butanediolate. The -xylyl and -tolyl complexes of either enantiomerically pure 2,3-butanediolate or 2,3-butanediolate (compounds -) crystallized in Sohncke space groups, as expected.
View Article and Find Full Text PDFSynthesis, Crystal Structures, Antimicrobial Activity, and Acute Toxicity Evaluation of Chiral Zn(II) Schiff Base Complexes.
Molecules
November 2024
Instituto de Química-UNAM, Circuito Exterior, C.U. Coyoacán, Mexico City C.P. 04510, Mexico.
Four mononuclear bioefficient zinc coordination complexes [Zn(NN)](ClO) (-) involving chiral bidentate Schiff base ligands have been synthesized and characterized by IR, H, and C NMR spectroscopy and mass spectrometry. X-ray crystal structures of three of the zinc complexes revealed that the zinc metal ion is hexacoordinated, exhibiting a distorted octahedral geometry where both the nitrogen atoms (NN = pyridyl and imine) of imines are coordinated to the central zinc ion. The isolated zinc complexes were evaluated for their antimicrobial activity in vitro against , , and , displaying varying levels of growth inhibition.
View Article and Find Full Text PDFEvaluation of Multidentate Ligands Derived from Ethyl 1,2,4-triazine-3-carboxylate Building Blocks as Potential An(III)-Selective Extractants for Nuclear Reprocessing.
ChemistryOpen
November 2024
Department of Applied Sciences, Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, Tyne and Wear, NE1 8ST, UK.
Bis-1,2,4-triazine ligands are amongst the most promising soft N-donor ligands for the partitioning of trivalent actinides from trivalent lanthanides; a key separation proposed in the future reprocessing of spent nuclear fuels. In an effort to improve the extraction properties of these benchmark ligands, we propose herein a general ligand design approach that is inspired by the field of drug discovery, and we apply it to a new class of ligands in which the bidentate 3-(2-pyridyl)-1,2,4-triazine unit of the benchmark ligands is replaced by a bidentate 1,2,4-triazine-3-carboxamide unit. A series of nine novel ligands were synthesized by reactions of readily available ethyl 1,2,4-triazine-3-carboxylate building blocks with different polyamine cores and evaluated for their ability to extract and separate Am(III) and Cm(III) from Eu(III).
View Article and Find Full Text PDFSupramolecular bidentate rhodium(I) or iridium(I) phosphine and oxazoline amino acid bioconjugates as selective catalysts for enantioselective reactions.
Dalton Trans
November 2024
Ruđer Bošković Institute, Bijenička c. 54, HR-10000 Zagreb, Croatia.
This publication describes monodentate phosphine and oxazoline ligands attached to an amino acid ester and the application of their supramolecularly assembled rhodium(I) or iridium(I) complexes in asymmetric catalysis. The major feature of these complexes is the transmission of chirality from distant hydrogen bonded amino acids to the prochiral catalytic metal center ("backdoor induction"). The generated homoleptic and heteroleptic rhodium(I) or iridium(I) precatalysts were studied by NMR, UV-VIS and CD spectroscopy as well as X-ray single crystal diffraction.
View Article and Find Full Text PDFUnderstanding ketone hydrogenation catalysis with anionic iridium(iii) complexes: the crucial role of counterion and solvation.
Chem Sci
December 2024
CNRS, LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, UPS, INPT 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France +33-561553003 +33-561333174.
Catalytic asymmetric hydrogenation of ketones is an important approach to prepare valuable chiral alcohols. Understanding how transition metals promote these reactions is key to the rational design of more active, selective and sustainable catalysts. A highly unusual mechanism for asymmetric hydrogenation of acetophenone catalysed by an anionic Ir hydride system, including a strong counterion dependence on catalyst activity, is explored and rationalised here.
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