Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ferromagnetic Coupling and Single-Ion Magnet Phenomenon in Mononuclear Ruthenium(Iii) Complexes Based on Guanine Nucleobase

Version 1 : Received: 10 August 2022 / Approved: 11 August 2022 / Online: 11 August 2022 (11:41:41 CEST)

A peer-reviewed article of this Preprint also exists.

Orts-Arroyo, M.; Moliner, N.; Lloret, F.; Martínez-Lillo, J. Ferromagnetic Coupling and Single-Ion Magnet Phenomenon in Mononuclear Ruthenium(III) Complexes Based on Guanine Nucleobase. Magnetochemistry 2022, 8, 93. Orts-Arroyo, M.; Moliner, N.; Lloret, F.; Martínez-Lillo, J. Ferromagnetic Coupling and Single-Ion Magnet Phenomenon in Mononuclear Ruthenium(III) Complexes Based on Guanine Nucleobase. Magnetochemistry 2022, 8, 93.

Journal reference: Magnetochemistry 2022, 8, 93
DOI: 10.3390/magnetochemistry8080093

Abstract

Two mononuclear Ru(III) complexes of formula trans-[RuCl4(Hgua)(dmso)]·2H2O (1) and trans-[RuCl4(Hgua)(gua)]·3H2O (2) [Hgua = protonated guanine (gua), dmso = dimethyl sulfoxide] have been synthesized and characterized magnetostructurally. Compounds 1 and 2 crystallize in the monoclinic system with space groups P21/n and Pc, respectively. Each Ru(III) ion in 1 and 2 is six-coordinate and bonded to four chloride ions and one (1) or two (2) nitrogen atoms from guanine molecules and one sulfur atom (1) of a dmso solvent molecule, generating quasi regular octahedral geometries in both cases. In their crystal packing, the Ru(III) complexes are self-assembled mainly through an extended network of N-H⋯Cl hydrogen bonds and π⋯Cl type intermolecular interactions, forming novel supramolecular structures based on this paramagnetic 4d metal ion. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a different magnetic behavior. While 1 is a ferromagnetic compound at low temperature, 2 exhibits a behavior typical of noninteracting mononuclear Ru(III) complexes with S = 1/2. Ac magnetic susceptibility measurements reveal slow relaxation of the magnetization in the presence of external dc fields only for 2, hence indicating the occurrence of field-induced single-ion magnet (SIM) phenomenon in this mononuclear guanine-based Ru(III) complex.

Keywords

Ruthenium; crystal structures; ferromagnetic coupling; molecular magnetism; single-ion magnet.

Subject

CHEMISTRY, Inorganic & Nuclear Chemistry

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