A. Romeo

TL;DR: The ground and excited-state properties of a series of meso-tetraphenylporphyrin (H2TPP) diacids, [H4TPP]-X)2 (X = F, Cl, Br, I), ad hoc synthesized and characterized by 1H NMR, RLS, and UV−vis spectroscopies, have been studied theoretically using density functional theory (DFT) and time-dependent densityfunctional theory (TDDFT). Several conformations corresponding to different deformations of the porphyrin core have been explored

TL;DR: A structural change from fractal to nanorod J-aggregates of tetrakis(4-sulfonatophenyl)porphyrin has been obtained by acting on the intermolecular interaction potential, and both fractals and rods display a structure-dependent optical activity induced by a chiral template.

TL;DR: The experimental evidence points to a marked dependence of the protonation and aggregation behavior on the nature of both acids and porphyrins andKinetic control of the aggregation process allows for a fine-tuning of the spectroscopic properties of the final aggregated species.

TL;DR: A simple method is described to obtain absorption spectra of aggregated species with a fairly good correction of the scattering component, and this method has been successfully applied both on real samples containing aggregated chromophores, such as porphyrins, chlorophyll a and gold colloids, and by simulating extinction spectra.

TL;DR: All the spectroscopic evidence suggest a J-type arrangement of chromophores in this aggregate, involving strong hydrogen bonds, electrostatic, and dispersive interactions.