Organogel–quantum dots hybrid materials displaying fluorescence sensitivity and structural stability towards nitric oxide

Abstract

Several kinetic models for the macrocyclization of a C 2 pseudopeptide with a dihalide through a S N 2 reaction have been developed. These models not only focus on the kinetic analysis of the main macrocyclization reaction, but also consider the competitive oligomerization/polymerization processes yielding undesired oligomeric/polymeric byproducts. The effect of anions has also been included in the kinetic models, as they can act as catalytic templates in the transition state reducing and stabilizing the transition state. The corresponding differential equation systems for each kinetic model can be solved numerically. Through a comprehensive analysis of these results, it is possible to obtain a better understanding of the different parameters that are involved in the macrocyclization reaction mechanism and to develop strategies for the optimization of the desired processes.

Significant enhancement of curcumin photoluminescence by a photosensitizing organogel: An optical sensor for pyrrole detection

“…Broadening of the excitation spectra suggested that the curcumin fluorophore might be influenced by the presence of molecule 1 fibril. It was reported that the excitation and emission spectra of a chromophore probe in an organogel would hardly change, if it had identical mobility of such probe in a solution [17,18]. The excitation spectra of curcumin organogel strongly suggested that the curcumin molecules were not likely to be dissolved freely in the liquid fraction of the DPH organogel.…”

“…The decay of PL intensity was proportional to the concentration of pyrrole and time. From the slope of the initial data sets, the apparent quenching rate r (= normalized intensity/time) was calculated for each concentration (see SI, Table S1) [17]. The quenching rates also increased with the pyrrole concentration, which supported the diffusional transportation of pyrrole in the curcumin organogel.…”

Surface Decoration of Organic Ligands on Quantum Dots: Fine Tuning of Photophysical Properties

“…Wadhavane et al reported the use of pseudopeptidic macrocycle (Fig. 20) to prepare organic/inorganic hybrid organogels [67]. Cyclophane is a macrocycle and is able to self-associate to form fibrils leading to thermo reversible organogels in a number of solvents.…”

Light-responsive hybrid material based on luminescent core–shell quantum dots and steroidal organogel

“…Moreover, the attachment of specific ligands on their surface strongly affects their luminescent properties also providing them with colloidal stability in different media. 12 Using the same LMOG results in a symbiotic effect between QDs and the LMOG, producing an enhancement of the CdSe luminescence (ca. 8 This approach is relevant not only for the design of functional materials, but also for understanding the properties that may arise from the interactions within the components of the hybrid composite.…”