Abstract
Three novel Ni complexes with the Schiff base ligand 2-methoxy-6-(E-2-pyridyliminomethyl)-phenol (L1) are described. In comparison with the similar 2-(pyridine-2-ylimino-methyl)phenol (pymp), the mode of coordination of L1 is altered due to the presence of methoxy substituent introducing the sterical hindrance. During the synthesis of the complexes, partial hydrolysis of the ligand was observed. Since such immediate hydrolysis of L1 was not detected during the reactions of Zn(II) and Cu(II) salts with L1, the DFT calculated structures of a series of similar Zn, Cu, Ni, and Co complexes with L1 are compared to account for the phenomenon.
Highlights
The first compounds that belong to imines or Schiff bases were synthesized by Hugo
In 2019, we described their coordination properties towards copper(II) and zinc(II) as well as magnetic and catalytic properties of the obtained copper(II)
As revealed by X-ray measurements, all obtained complexes contained as ligands the imine L1 and products of imine hydrolysis; either 2-AP or both 2-AP and OV
Summary
The first compounds that belong to imines or Schiff bases were synthesized by Hugo. Schiff in 1864 [1]. Thanks to flexible structures and a variable number and character of donor atoms, Schiff bases have the ability to coordinate a wide range of metal ions including both main group and transition metals as well as lanthanides and actinides. Knowing that application of similar hemisalen ligands (Scheme 1) returned a variety of coordination modes with a wide choice of metal ions including nickel(II) [5,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26], we assumed that the synthesis would be simple and efficient. Formula of ligand L1 [5,27] and selected similar hemisalen ligands: 2-(pyridine-2-ylimino-methyl)phenol [9,10,11,12,13,14,15,16,17,19,23,24,25]; 4-bromo-2-(pyridine-2-yliminomethyl)phenol [21,22]; and 2-[(E)-(quinolin-3-yliminomethyl)]phenol [7]
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