André Seco
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View article: The impressive colors of the bis-aminostyrylbenzopyrylium system. Evidence by stopped-flow for the B4 formation at pH>13
The impressive colors of the bis-aminostyrylbenzopyrylium system. Evidence by stopped-flow for the B4 formation at pH>13 Open
Funding Information: This work was supported by the Associate Laboratory for Green Chemistry - LAQV (UIDB/50006/2020) which is financed by national funds from FCT/MCTES and by the AgriFood XXI I&D&I project (NORTE-01-0145-FEDER-000041) co-…
View article: Comparing the Chemistry of Malvidin-3-<i>O</i>-glucoside and Malvidin-3,5-<i>O</i>-diglucoside Networks: A Holistic Approach to the Acidic and Basic Paradigms with Implications in Biological Studies
Comparing the Chemistry of Malvidin-3-<i>O</i>-glucoside and Malvidin-3,5-<i>O</i>-diglucoside Networks: A Holistic Approach to the Acidic and Basic Paradigms with Implications in Biological Studies Open
The kinetics, thermodynamics, and degradation of malvidin mono- and diglucosides were studied following a holistic approach by extending to the basic medium. In acidic conditions, the reversible kinetics of the flavylium cation toward the …
View article: Intermolecular Copigmentation of Malvidin-3-<i>O</i>-glucoside with Caffeine in Water: The Effect of the Copigment on the pH-Dependent Reversible and Irreversible Processes
Intermolecular Copigmentation of Malvidin-3-<i>O</i>-glucoside with Caffeine in Water: The Effect of the Copigment on the pH-Dependent Reversible and Irreversible Processes Open
Intermolecular copigmentation of malvidin-3-O-glucoside with caffeine was studied using a holistic procedure that includes the extension to basic pH values. In moderately basic solutions (7.5 < pH < 9.5) and independently of the copigment …
View article: Light‐ and pH‐regulated Water‐soluble Pseudorotaxanes Comprising a Cucurbit[7]uril and a Flavylium‐based Axle
Light‐ and pH‐regulated Water‐soluble Pseudorotaxanes Comprising a Cucurbit[7]uril and a Flavylium‐based Axle Open
A linear double pyridinium‐terminated thread comprising a central chalcone moiety is shown to provide two independent binding sites with similar affinity for cucurbit[7]uril (CB7) macrocycles in water as judged from NMR, UV‐Visible and flu…
View article: Exploring the pH-dependent kinetics, thermodynamics and photochemistry of a flavylium-based pseudorotaxane
Exploring the pH-dependent kinetics, thermodynamics and photochemistry of a flavylium-based pseudorotaxane Open
Flavylium-based molecular switches are attractive molecular components to devise stimuli-responsive host-guest systems such as rotaxanes and pseudorotaxanes. These compounds display a pH-dependent reaction network of several species that r…
View article: Toward Light-Controlled Supramolecular Peptide Dimerization
Toward Light-Controlled Supramolecular Peptide Dimerization Open
The selective photodeprotection of the NVoc-modified FGG tripeptide yields the transformation of its 1:1 receptor-ligand complex with cucurbit[8]uril into a homoternary FGG2@CB8 assembly. The resulting light-induced dimerization of the mod…
View article: Evolution of Flavylium-Based Color Systems in Plants: What Physical Chemistry Can Tell Us
Evolution of Flavylium-Based Color Systems in Plants: What Physical Chemistry Can Tell Us Open
Anthocyanins are the basis of the color of angiosperms, 3-deoxyanthocyanins and sphagnorubin play the same role in mosses and ferns, and auronidins are responsible for the color in liverworts. In this study, the color system of cyanidin-3-…
View article: A pseudorotaxane formed from a cucurbit[7]uril wheel and a bioinspired molecular axle with pH, light and redox-responsive properties
A pseudorotaxane formed from a cucurbit[7]uril wheel and a bioinspired molecular axle with pH, light and redox-responsive properties Open
A pH-, light- and redox-responsive flavylium-bipyridinium molecular dyad (bioinspired in natural anthocyanins) was synthesized and employed to devise a pseudorotaxane with the macrocycle cucurbit[7]uril (CB7) in aqueous solution. The inclu…