Acta Chimica Slovaca (ACS) publishes papers on fundamental and applied aspects of chemistry, biochemistry, chemical technology, chemical engineering and process control, biotechnology and food technology. Welcome are also topics which include chemical aspects of materials, physical chemistry and chemical physics, analytical chemistry, macromolecular chemistry and biomedical engineering.

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

Lenka Krešáková *, Juraj Černák

Department of Inorganic Chemistry, Faculty of Science, P. J. Šafárik University in Košice, Moyzesova 11, 041 54 Košice, Slovakia

E-mail: * lenka.kresakova@upjs.sk

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).

Keywords: crystal structure analysis, heterometallic complex, Schiff base type ligand, tetranuclear complex

Acta Chimica Slovaca, Vol. 18, No. 1, 2025, pp. 81—90, DOI: 10.2478/acs-2025-0009