Effects of Concentration on Aggregation of BODIPY-Based Fluorescent Dyes Solution
- PDF / 2,895,998 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 23 Downloads / 188 Views
ORIGINAL ARTICLE
Effects of Concentration on Aggregation of BODIPY-Based Fluorescent Dyes Solution Yuriy S. Marfin 1
&
Elizaveta A. Banakova 1 & Dmitry A. Merkushev 1 & Sergey D. Usoltsev 1 & Andrei V. Churakov 2
Received: 5 August 2020 / Accepted: 7 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Despite significant progress in understanding of dye aggregation, there are still processes that need to be further explored and which can significantly affect aggregation. In this work it was shown that the aggregation of dyes is influenced not only by dye concentration, but also by solvent polarity. It was found that nature, positions and number of fluorescent peaks may be controlled by simultaneous varying of both water fraction and dye concentration. This effect is most pronounced for molecular rotors, which aggregates’ geometry may be stabilized in different separate states depending on the aggregation degree. The concentration effect plays a significant role in dye aggregation and should be considered in new studies in order to prevent misinterpretation or to obtain new results in fields of molecular sensing or fine-tuning of fluorescence color. In this paper aggregation caused spectral changes are discussed in line with the dye structure preorganization as the strategy for the fine tuning of practically valuable spectral characteristics. Keywords BODIPY . Fluorescence . Solvent effects . Aggregation . Excimer . ACQ . Molecular rotors
Introduction Among the numerous classes of highly fluorescent dyes, the ones based on 4,4-difluoro-4-bora-3a,4a-diaza-sindacene (known as BODIPY, difluoroboron dipyrromethene) are of interest. These dyes exhibit excellent photophysical properties: high molar extinction coefficients and fluorescence quantum yields, narrow Highlights • The simultaneous influence of dye concentration and solvent polarity on aggregation processes has been revealed. • The way to change and control dye spectral characteristics by aggregation has been studied. • The analysis of spectral and aggregation properties was carried out in THF-Water mixtures with different water fractions and dye concentrations. * Yuriy S. Marfin [email protected] 1
Department of Inorganic Chemistry, Ivanovo State University of Chemistry and Technology, Sheremetevsky avenue, 7, Ivanovo region Ivanovo, Russian Federation 153000
2
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prospect, 31, Moscow, Russian Federation 119991
absorption and fluorescence peaks. They are advantageous due to wide possibilities and relative simplicity of chemical modification [1–3]. BODIPY complexes are promising compounds for application as liquid phase sensors [4], measuring agents for solvents parameters (pH, dynamic viscosity, etc.) [5–7] highly selective anion and cation fluorescent switches [8], where luminophores are used in dilute solutions. However modern optoelectronic device technology: organic light-emitting diodes (OLEDs) [9], solar cells [10] requ
Data Loading...
