Hydrogen-bonded and -stacked nickel(II) thiosemicarbazone complexes: Synthesis, spectral and structural studies

Ulkuseven, Bahri/0000-0001-6342-1505; Ozdemir, Namik/0000-0003-3371-9874; SOYLU, SERKAN M/0000-0002-8440-1260 WOS: 000461331500002 Mixed ligand Ni(II) complexes were synthesized from triphenylphosphine and S-methyl- or S-ethyl-isothiosemicarbazone ligands derived from 3-bromo-5-chloro-2-hydroxy-benzaldehyde. The complexes were characterized by physicochemical and spectroscopic methods. In addition, their molecular structures were determined by single-crystal X-ray diffraction. In both complexes, the Ni atom has a near square-planar geometry, being coordinated by the phenolato oxygen, azomethine nitrogen and amine nitrogen atoms of the thiosemicarbazone ligands, together with the phosphorus atom of the triphenylphosphine. The S-methyl complex includes an additional free thiosemicarbazone ligand in the asymmetric unit. X-ray analysis shows that O-HN, N-HN, C-HN and C-HO-type hydrogen bonds and - stacking interactions are responsible for stabilizing the crystal structures. Scientific Research Projects Coordination Unit of Istanbul UniversityIstanbul University [BYP-2017-21222] This work was supported by the Scientific Research Projects Coordination Unit of Istanbul University (Project Number: BYP-2017-21222).