Iodine clocks: applications and untapped opportunities in materials science

Abstract

Iodine clocks are fascinating nonlinear chemical systems with a glorious past and a promising future. The dynamic removal of iodine from these systems by different means can have important consequences for their reaction dynamics, and could be exploited for time-controlled autonomous dissipative self-assembly. Here, the untapped opportunities offered by iodine clocks for materials science, especially for the time-programming of supramolecular assembly and sol–gel transition, are reviewed and discussed with the hope of arousing the interest on the subject and stimulating new research directions.

Global trends assessment of environmental health degradation studies from 1990 to 2018

“…En el reloj de yodo el yodo es el producto de la reacción y su acumulación es la que marca el final de la reacción. El yodo puede formar complejos supramoleculares con diversas moléculas pequeñas y poliméricas, como la amilosa (componente del almidón); la formación del complejo yodo-amilosa se evidencia por la aparición del color azulnegro al final de la reacción (Panzarasa, 2022). Este tipo de reacciones se emplean para estudiar las variables que influyen en la cinética química de reacciones con nanocatalizadores y complejos supramoleculares (macromoléculas unidas por interacciones intermoleculares) (Molla & Youk, 2022;Panzarasa, 2022).…”

Methylene glycol-sulfite pH-clocks for the time-programming of soft materials: advantages, limitations, and yet unexplored opportunities

“…Recently, the applications of iodine-based clock reactions (''iodine clocks'') to materials science have been reviewed. 10 Here, the focus will be on the time-programming of soft materials using the methylene glycol-sulfite (MGS, ''formaldehyde clock'') † pH-clock, as well as systems derived by the addition of slow acid generators (such as d-gluconolactone GL, 1,3-propanesultone PrS). One of the most distinctive traits of the MGS system is its unicity, as so far it is the only veritable example of a non-enzymatic acid-to-base pH-clock.…”