Peer Reviewed: Redox and Photoactive Dendrimers in Solution and on Surfaces

Abstract

Because of the broad range of potential applications, interest in the preparation and characterization of redox and photoactive supramolecular structures, particularly dendrimers, is widespread. These applications include sensors, electrochromic and electroluminescent display devices, light harvesting, redox mediators, molecular electronics, and MRI materials. Dendrimers are highly branched globular molecules that consist of a core, selfreplicating branching units, and peripheral surface groups ( Figure 1); given their relatively high molecular weight, they can be considered "monodisperse polymers" (1-4). Dendrimers can be functionalized with reactive groups at the core, at the periphery, or throughout the entire structure and are ideal platforms for modification with redox and photoactive groups (5-8). We have synthesized and characterized dendrimers that are decorated on the periphery with redox and photoactive centers based on transition metal complexes and explored their electro-and photochemical properties in solution and on surfaces.

An electrochemical DNA biosensor developed on novel multinuclear nickel(II) salicylaldimine metallodendrimer platform

“…From the plot of peak cathodic/anodic peak current versus square root of scan rate, the electron diffusion coefficient D e , a measure of how fast charge can be transported through the dendrimer layer, was calculated using Randle Sevcik equation and found to be 8.597 × 10 −8 cm 2 s −1 . This reiterated the conductivity of the dendrimer and this value is comparable to those reported in literature for conducting polymers -D e of 6.68 × 10 −9 cm 2 s −1 [25], 6.46 × 10 −8 cm 2 s −1 [26] and for dendrimer, 3.6 × 10 −7 cm 2 s −1 [27].…”

Metallodendrimers in three oxidation states with electronically interacting metals and stabilization of size-selected gold nanoparticles

“…T o date, dendrimers and metal nanoparticles (NPs) have been largely involved in materials science including nanomedicine, photonics and supramolecular chemistry [1][2][3][4][5] , and in particular metallodendrimers and dendrimercontaining NPs 2-4,6-11 have been efficiently designed for catalysis [2][3][4] , photophysics [7][8][9][10][11] and sensing [9][10][11][12][13] . Redox-stable metallodendrimers are a specific class of materials allowing redox anion recognition, sensing [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and biosensing 14,15 that have been used essentially with ferrocene derivatives [12][13][14][15] .…”

“…Redox-stable metallodendrimers are a specific class of materials allowing redox anion recognition, sensing [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and biosensing 14,15 that have been used essentially with ferrocene derivatives [12][13][14][15] . Although biferrocene-and silicon-bridged biferrocene-terminated dendrimers are known 5,[14][15][16] , no dendrimers have yet been isolated in several oxidation states owing to instability of the oddelectron species.…”

Voltage-Activated Adhesion through Donor–Acceptor Dendrimers

“…For conjugates samples, the current signals decay after three cycles as seen in Figure S9. Possible explanations include electrode grafting or amine oxidation. − ,− …”