Abstract: Two approaches are proposed for obtaining heterospin complexes with an anion-radical of difurazanopyrazine L – a paramagnetic derivative of 4 ,8 -bis(1,2,5-oxadiazolo)[3,4-b:3′,4′- ]pyrazine. Aqua 3d metal complexes [ML2(H2O)4]·2H2O (M = Ni and Co) were synthesized using saturated solutions of reagents with a large excess of M(NO3)2. Ammine complexes [ML2(NH3)4] (M = Ni and Cu) were obtained from the reaction of M(NO3)2 with NaL(H2O)3 in a stoichiometric ratio in the presence of concentrated aqueous ammonia (28%). In all complexes, metal ions coordinate L N atoms of the pyrazine ring. Molecules of the complexes are linked into a framework by hydrogen bonds. It was found that in [ML2(NH3)4] strong antiferromagnetic exchange interactions are realized between anion-radicals from neighboring molecules, determining the magnetic behavior of the phase as a whole. Whereas in [ML2(H2O)4]·2H2O, the exchange interactions are ferromagnetic in nature. This is due to the presence of water molecules in the structure, which provide a displacement of the complex molecules relative to each other and, as a consequence, a weakening of the interactions between adjacent L.

Cite: Fokin S. , Tolstikov S. , Morosov V. , Samsonenko A. , Romanenko G. , Bogomyakov A.
Aqua and ammine 3d metal complexes with anion-radical of difurazanopyrazine
CrystEngComm. 2025. V.27. P.7902-7908. DOI: 10.1039/D5CE00836K WOS OpenAlex

Dates:

Submitted:	Aug 27, 2025
Accepted:	Oct 25, 2025
Published online:	Oct 29, 2025
Published print:	Dec 8, 2025

Identifiers:

Web of science:	WOS:001619714100001
OpenAlex:	W4415655561

Citing: Пока нет цитирований

Altmetrics: