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Intertwining of Localized () and Delocalized (π) Spins in Magnetically Frustrated Two-Dimensional Metal-Organic Frameworks. | LitMetric

AI Article Synopsis

  • Two-dimensional metal-organic frameworks (2D MOFs) are being researched for their potential magnetic properties, particularly in systems with a Kagome lattice structure that may exhibit quantum spin liquid states.
  • The study focuses on a bimetallic 2D MOF system, M(HHTP), where the arrangement of copper and zinc ions leads to unique spin interactions and frustrations at very low temperatures.
  • By analyzing different compositions of CuZn(HHTP) and comparing them with Zn(HHTP), the research aims to understand how localized and delocalized spins contribute to the materials' unusual magnetic behaviors.

Article Abstract

Two-dimensional metal-organic frameworks (2D MOFs) are emerging as a new class of multifunctional materials for diversified applications, although magnetic properties have not been widely explored. The metal ions and organic ligands in some of the 2D MOFs are arranged in the well-known Kagome lattice, leading to geometric spin frustration. Hence, such systems could be the potential candidates to exhibit an exotic quantum spin liquid (QSL) state, as was observed in Cu(HHTP) (HHTP = hexahydroxytriphenylene), with no magnetic transition down to 38 mK. Hereto, we have investigated the spin intertwining in a bimetallic 2D MOF system, M(HHTP) (M = Cu/Zn) arising from the localized (d-electron) and delocalized (π-electron) = 1/2 spins from the Cu(II) ions and the HHTP radicals, respectively. The origin of the spin frustration (down to 5K) was critically examined by varying the metal composition in bimetallic systems, CuZn(HHTP) ( = 1, 1.5, 2), containing both = 1/2 and = 0 spins. Additionally, to gain a deeper understanding, we studied the spin interaction in the pristine Zn(HHTP) system containing only = 0 Zn(II) ions. In view of the quantitative estimate of the localized and delocalized spins, the d-π spin correlation appears essential in understanding the unusual magnetic and/or other physical properties of such hybrid organic-inorganic 2D crystalline solids.

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Source
http://dx.doi.org/10.1021/acs.inorgchem.3c03247DOI Listing

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