Two tetranuclear [Ni(II)/Dy(III)]2 solvatomorphs based on symmetric bicompartmental Schiff base type ligand

Krešáková, Lenka; Černák, Juraj

doi:10.2478/acs-2025-0009

Abstract

From the system [Ni(o-van-en) ] — DyBr₃, a novel tetranuclear complex [Ni(o-van-en) Dy(H₂O)₂(OH)]₂Br₄·6H₂O (1) was isolated; H₂(o-van-en) was synthesized by 2/1 condensation of o-vanillin and ethylenediamine. Single crystals (SC) of 1, upon standing in methanol/isopropanol mother liquor, underwent a SC-SC transformation and yielded a new solvatomorph [Ni(o-van-en)Dy(H₂O)₂(OH)]₂Br₄·MeOH· iPrOH·H₂O (2). Both complexes, 1 and 2, were characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray analysis. Crystal structures of both 1 and 2 are ionic. Within the bicompartmental unit {Ni(o-van-en)Dy(H₂O)₂(m-OH)}, the square coordinated Ni(II) atom occupies the smaller cavity (donor set is cis-N₂O₂) while the octacoordinated Dy(III) atom (donor set is O₈) is placed in the larger cavity. The two [Ni(o-van-en)Dy(H₂O)₂(m-OH)] units are linked by a pair of m-OH bridging ligands. The unit cell content is completed by bromide anions and water (1) or methanol, isopropanol, and water solvate molecules (2).

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Two tetranuclear [Ni(II)/Dy(III)]2 solvatomorphs based on symmetric bicompartmental Schiff base type ligand

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