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

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

Content Provider	MDPI
Author	Jos, é Martínez-Lillo Orts-Arroyo, Marta Moliner, Nicolás Lloret, Francesc
Copyright Year	2022
Description	Two mononuclear $Ru^{III}$ complexes of formula $trans-[RuCl_{4}(Hgua)(dmso)]·2H_{2}$O (1) and $trans-[RuCl_{4}(Hgua)(gua)]·3H_{2}$O (2) [Hgua = protonated guanine (gua), dmso = dimethyl sulfoxide] have been synthesized and characterized magnetostructurally. 1 and 2 crystallize in the monoclinic system with space groups $P2_{1}$/n and Pc, respectively. Each $Ru^{III}$ ion in 1 and 2 is 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 axially compressed octahedral geometries in both cases. In their crystal packing, the $Ru^{III}$ complexes are connected through an extended network of N-H⋯Cl hydrogen bonds and π⋯Cl intermolecular interactions, forming novel supramolecular structures of this paramagnetic 4d ion. Variable-temperature dc magnetic susceptibility data were obtained from polycrystalline samples of 1 and 2 and their plots show a different magnetic behavior. While 1 is a ferromagnetic compound at low temperature, 2 exhibits a behavior of magnetically isolated mononuclear $Ru^{III}$ complexes with S = 1/2. The study on ac magnetic susceptibility data reveal slow relaxation of the magnetization, when external dc fields are applied, only for 2. These results highlight the presence of field-induced single-ion magnet (SIM) behavior for this mononuclear guanine-based $Ru^{III}$ complex.
Starting Page	93
e-ISSN	23127481
DOI	10.3390/magnetochemistry8080093
Journal	Magnetochemistry
Issue Number	8
Volume Number	8
Language	English
Publisher	MDPI
Publisher Date	2022-08-17
Access Restriction	Open
Subject Keyword	Magnetochemistry Inorganic Chemistry Ruthenium Crystal Structures Ferromagnetic Coupling Molecular Magnetism Single-ion Magnet
Content Type	Text
Resource Type	Article

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