Synthesis of imine bond containing insoluble polymeric ligand and its transition metal complexes, structural characterization and catalytic activity on esterification reaction

Abstract

In this study, synthesis of insoluble polymeric ligand (L) and its transition metal complexes [Cu(L)Cl2]·2H2O (1), [Co(L)Cl2(H2O)2] (2) and [Ni(L)Cl2(H2O)2] (3), having the azomethine groups, were synthesized by the condensation reactions of the diamines and dialdehydes. The structural properties were characterized by the analytical and spectroscopic methods using by elemental analysis, Fourier Transform Infrared, Thermo Gravimetric Analysis, Powder X-ray Diffraction, magnetic susceptibility and Inductively Coupled Plasma. The solubilities of the synthesized polymeric materials were also investigated and found as insoluble some organic and inorganic solvents. Additionally, their catalytic performance was carried out for the esterification reaction of acetic acid and butyl acetate. The highest conversion rate is 75.75% by using catalyst 1. The esterification of butanol gave butyl acetate with 100% selectivity.

The effect of metalation processes on polymer morphology and conductivity properties

“…In all the complexes, this band shifted the lower frequencies, indicating the coordination of azomethine nitrogen to the metal. 44,48 The donation of electrons through the azomethine nitrogen diminishes the (C = N) bond electron density, and hence, the υ(C = N) stretching shift of the lower frequencies. This is supported by the appearance of a new band in the 583-690 cm À1 region due to the metal ligand bonding.…”

“…35,36,42 In addition to the methods, the type of monomeric unit, preparation method and metalation process play a key role in the behaviour of the polymer. [43][44][45][46][47] The monomeric units as linkers are one of the most important cases for achieving targeted compositions because of electrical conductivity and a 3D structure. If the linker has double bonds that allows the delocalisation of electron, then the conductivity rises.…”

Ionic metallo‐Schiff base polymers of VO2+, Zn2+ and Cu2+: Synthesis, characterization and solid‐state conductivity

“…Schiff bases and their coordination chemistry have been significantly developed over the last few decades because of their wide range of applications . Many researches have recently been devoted to the investigation of N , N ′‐bipyridinium compounds and complexes due to their unique properties .…”