The crystal structure of the title compound, [CoCl(2)(C(6)H(12)N(2)S)(2)], consists of monomer units of a Co(II) atom coordinated to two 1-propylimidazolidine-2-thione ligands and to two chloride ions. The heterocyclic thione ligand is monodentate and coordinated to the metal through the thione S atom. The environment around the Co(II) atom is a slightly distorted tetrahedron. The Co-S bond lengths are 2.341 (2) and 2.330 (2) A, and the Co-Cl bond lengths are 2.234 (2) and 2.238 (2) A. The most important point of distortion is the S-Co-S bond angle of only 97.83 (8) degrees. Intramolecular classical hydrogen bonds are found between the chloride ions and the N-H groups. Additionally, intra- and intermolecular non-classical hydrogen bonds are found.
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http://dx.doi.org/10.1107/s0108270102006285 | DOI Listing |
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December 2024
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
A mixed-ligand-based thermo-chemically robust and undulated metal-organic framework (MOF) is developed that embraces carboxamide moiety-grafted porous channels and activation-induced generation of open-metal site (OMS). The guest-free MOF acts as an outstanding heterogeneous catalyst in Hantzsch condensation for electronically assorted substrates with low catalyst loading and short duration under greener conditions than the reported materials. Besides Lewis acidic OMS, the carboxamide group activates the substrate via two-point hydrogen bonding, highlighting the effectiveness of custom-made functionalities in this multi-component reaction.
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December 2024
Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
In the study of mononuclear transition metal single molecule magnets (SMMs), extensive research has concentrated on identifying optimal coordination geometries around the central metal ion to enhance SMM properties. However, the role of non-covalent interactions in the second coordination sphere has been relatively underexplored. Here, we study the impact of non-covalent Cl⋯H interactions on the magnetic anisotropy of the central Co(II) ion in the distorted axially compressed octahedral complex CoCl(tu) (1) (tu = SC(NH)).
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
School of Environmental and Chemical Engineering, Shanghai University, 200444, 99 Shangda Road, Shanghai, P. R. China.
Although the catalytic activity is heavily reliant on the electronic structure of the catalyst, understanding the impact of electron spin regulation on electrocatalytic performance is still rarely investigated. This work presents a novel approach involving the single-atom coordination of cobalt (Co) within metalloporphyrin-based three-dimensional covalent organic frameworks (3D-COFs) to facilitate the catalytic conversion for sodium-iodine batteries. The spin state of Co is modulated by altering the oxidation state of the porphyrin-centered Co, achieving optimal catalysis for iodine reduction.
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November 2024
Department of Engineering and Natural Sciences, University of Applied Sciences Merseburg, Eberhard-Leibnitz-Straße 2, 06217 Merseburg, Germany.
Three novel complexes of deprotonated diflunisal () with neocuproine () were synthesized and characterized elemental, spectral (UV-vis, FTIR, fluorescence, and mass spectrometry), and single-crystal X-ray diffraction analyses. Although the compounds shared a similar composition of [MCl()()], where M represents Zn(II) (1), Co(II) (2) and Cu(II) (3), only 1 and 2 were isostructural, while 3 differed in both the molecular and supramolecular structures. In all three complex molecules, the central atom is coordinated by two nitrogen atoms of in a bidentate chelate mode, and one chlorido ligand and is bonded in either a monodentate mode one oxygen atom of the carboxylate in 1 and 2 or in a bidentate chelate mode both carboxylate oxygen atoms in 3.
View Article and Find Full Text PDFThe title coordination polymer, [Co(N)(CHN)] , was synthesized solvothermally. The Co atom exhibits a distorted octa-hedral [CoN] coordination geometry with a bidentate 8-amino-quinoline ligand and four azide ligands. Bridging azide ligands result in chains extending along [100].
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