The Copper(ii) Syn-Phenyl-2-Pyridyl Ketoxime System Part I

Abstract

A survey has been made of the reactions of both geometric isomers of phenyl-2-pyridyl ketoxime with metal ions. The complexes of copper(II) with the syn-phenyl isomer have been investigated. Acid dissociation constants of both geometric isomers, and of the 2:1 copper chelate of the syn-phenyl oxime have been determined.

Thermal and structural characterization of copper(II) complexes with phenyl-2-pyridylketoxime (HPPK)

“…Compounds 1-3 were synthesized as presented earlier [1,29]. It was found that the compounds take up water over time, which might explain some discrepancies in the elemental analyses (the expected results are given, taking into account the presence of 0.5 water molecule for each compound as well …”

“…The chemistry of metal complexes with oxime type of ligands has been investigated from the 1960s of the twentieth century due to their applications as analytical reagents [1][2][3][4]. Currently, a renewed interest in this class of compounds can be observed, as they are being used for the design of homo-/heterometallic clusters [5], as well as coordination polymers with attention-grabbing properties [6].…”

“…In all mononuclear complexes, HPPK shows an N,N 0 -chelating coordination mode involving both the nitrogen atom of the oxime group and the nitrogen atom of Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 87-100 Toruń, Poland the pyridyl group. However, depending on the pH and deprotonation level [1,16], coordination via the oxygen atom is also feasible, leading to the formation of higher nuclearity compounds, whereby the composition of the final product depends on many other factors, such as metal ion, counterions and molar ratio [17][18][19]. Studies focusing on the thermal behaviour of HPPK metal complexes are also rare to come by.…”