Metallo-functionalized first-generation salicylaldimine poly(propylenimine) tetraamine dendrimers: Electrochemical study and atomic force microscopy imaging

Abstract

The adsorption and the redox processes of two first-generation salicylaldiamine dendritic ligands and their copper, cobalt and nickel metallofunctionalized complexes have been studied at two types of carbon electrode surface. Glassy carbon (GC) was used in an electrochemistry study and highly oriented pyrolitic graphite (HOPG) in ex situ atomic force microscopy (AFM) imaging. All salicylaldimine ligands and their metallofunctionalized complexes adsorb on the surface of the HOPG electrode, resulting in the formation of nanoclusters and films, which vary between 0.9 and 6 nm in size, depending on the metallo-functionalized salicylaldimine dendrimer chemical composition and solution concentration. Differential pulse voltammetry of the surface-confined films has shown that the anodic reactions observed correspond to the oxidation of the hydroxyl groups present in the ligand structure of all compounds. However, by following the changes in peak currents, potentials and width at half height it has been shown that destabilization of the ligand internal structure occurred in the metallo-functionalized complexes depending on the metal involved. The electrochemical behaviour of the surface-confined films observed in buffer solution was related to the morphology, obtained by AFM, of the immobilised first-generation salicylaldiamine dendritic ligands and corresponding salicylaldimine metallo-functionalized complexes.

Dendrimers and derivatives as a potential therapeutic tool in regenerative medicine strategies—A review

“…Innovative synthetic procedures have increased accessibility to the functionalization of dendrimers with transition metals in the core, finding interesting applications in catalysis [127][128][129][130]. Several authors have proposed the use of dendrimers to develop complexes with metals, including Pt [131], Ag [132,133], Fe [134], Cu and Ni [135]. Most metallodendrimers are built from organic skeletons, in particular from PAMAM or PPI type dendrimers.…”

Novel Dendritic PNP Chromium Complexes: Synthesis, Characterization, and Performance on Ethylene Oligomerization

“…Metallodendrimers are well‐defined, highly branched, three dimensional macromolecules with characteristic globular structures . These novel macromolecules functionalized with transition metals have inspired many researchers to develop new materials and several applications have been explored, catalysis being one of them.…”

“…Metallodendrimers are well-defined, highly branched, three dimensional macromolecules with characteristic globular structures. [1] These novel macromolecules functionalized with transition metals have inspired many researchers to develop new materials and several applications have been explored, [2] catalysis being one of them. [3] [4] One of the advantages of catalysts based on metallodendrimers is the possibility of combining the best properties of homogeneous and heterogeneous catalyst in one system.…”

“…[12] Follow their discovery, there were many studies on the electronic and steric factors that improved the PNP ligands novel selectivity and excellent activity, as well enhanced the effect of the ligands backbone length and composition. [1][5] [6] During these discoveries, Bollmann et al [13] reported the PNP catalyst systems could selectively produce 1-octene. Own to its perfective selectivity for 1-hexene and 1-octene, it has been widely studied on ethylene trimerization and tetramerization.…”

Synthesis and characterization of polyamide metallodendrimers and their anti-bacterial and anti-tumor activities

“…Metallodendrimers are well-defined, highly branched, three dimensional macromolecules with characteristic globular structures for the larger systems (Martinovic et al, 2008). These novel macromolecules functionalized with transition metals have inspired many researchers to develop new materials for pharmaceutical application (Yang and Kao, 2006).…”