Mechanism of Peripheral Substituent Effects on Adsorption–Aggregation Behaviors of Cationic Porphyrin Dyes on Tungsten(VI) Oxide Nanocolloid Particles

Abstract

The adsorption and aggregation behaviors of the cationic porphyrin derivatives such as 5,10,15,20-tetrakis(4-pyridyl)porphyrin [TPyP],5,10,15, Judging from the exciton coupling theory and adsorption measurements, we concluded that the J-dimer geometry of the TPyP derivatives adsorbed on the WO 3 colloid particle surface is strongly dependent on the presence and difference of peripheral substituents. The results described here indicate a new and promising way of designing surface supramolecular structures combination of two principles, the selfassociation of organic dyes and the steric repulsive interaction between the peripheral substituents and the inorganic semiconductor surfaces.

Conformational-Switch Based Strategy Triggered by [18] π Heteroannulenes toward Reduction of Alpha Synuclein Oligomer Toxicity

“…Synthesis of porphyrins 1 , 4 , and 7 were carried out following the Adler method . Since these macrocycles ( 1 , 4 , and 7 ) were not water-soluble, they were made soluble following literature methods. − Subsequently, these water-soluble macrocycles were metalated with zinc salt. The UV–vis absorption spectra, NMR spectra, and chemical analysis of all the macrocycles (both in free base forms and zinc-complexes) are well consistent with the structures.…”

Strategy for Improved Photoconversion Efficiency in Thin Photoelectrode Films by Controlling π-Spacer Dihedral Angle

“…This could be related to aggregation effects caused by the long alkyl chain in BT-HT. 31 In addition, the π-spacer affected not only shift in the ICT peak but also the LHE (Figure 3b). The LHE (λ) is described by 32,33…”

“…However, the ICT peak of BT-HT showed no blue shift compared with that of BT-T , although BT-HT (53.5°) had a larger dihedral angle than BT-T (0.3°). This could be related to aggregation effects caused by the long alkyl chain in BT-HT …”

Self-directedly assembled porphyrin thin films with high photoactivity

“…3 and those of the literatures reported, 12,13 it is deduced that axial coordination between the Co 3+ ion in the center of CoTHPP macrocycle and ICPTES has happened besides peripheral reaction between -OH and ICPTES, which causes energy level shis by the p-p interaction among porphyrin stacking. 6,17 In order to further demonstrate the formation of SMPCM and lm 1, the FTIR spectra of the CoTHPP, SMPCM and lm 1 were measured. As can be seen in Fig.…”