Dear Colleagues,

Dual fluorescence effects denmonstrated by 1,3,4-thiadiazoles, coumarins and many other compounds are associated with numerous structural, physical, chemical and spectroscopic parameters. The multidisciplinary studies on dual fluorescence and related phenomena are of growing interest to a large number of research teams worldwide. Recent progres in spectroscopy and especially in fluorescence techniques enables new possibilities for explanation of various aspects related to dual emission. Various non-typical fluorescence effects demonstrated by novel derivatives provide opportunities for developmnet of new fluorescent probes, sensors, dyes, organic light-emitting diodes (OLEDs), organic solid-state lasers, new polymeric materials, or UV-light polimer stabilizers, to name only a few. Also, a notably high biological activities are often observed in molecules, which demonstrate the dual fluorescece. Although commonly observed, the relationship between the dual fluorescence phenomenon and biological activity (antifungal, antibacterial, antitumor, neuroprotective) is not yet fully understood.

This special issue is dedicated mainly to a subject of dual fluorescence observed in various molecules and systems such as organic solvents, aqueos media with varied pH and temperature, solid state amorphous and crystalline forms, or various mixed systems. The research on dual fluorescence in model biological systems such as liposomal, micellar, nanoparticles, and complex systems are particularly welcome. Also, reports dealing with structural modifications, which result in derivatives demonstrating the dual fluorescence or related effects are strongly encouraged. Moreover, we encourage submissions of multidisciplinary reports and particularly those incorporating the biological activity observed in dual fluorescence emitting molecules. Studies on novel derivatives characteristic of large Stokes shifts, red emission, various solvent-dependent fluorescence effects, and theoretical studies utilizing DFT, and [TD]DFT will also be considered.

Main topics

(1) Dual fluorescence /non-typical

(2) ESIPT, TICT, AIE and other molecular aggregation-related effects, CIKE or CIKEE (Crystallization‐Induced Emission Enhancement), AIE-ESIPT, Fluorescent dyes, Solvent-dependent fluorescence effects, Excited state, Charge transfer, metal complex

(3) Molecular spectroscopy (electronic absorption and emission, fluorescence lifetime, molecular electronic transition spectroscopy, FT-IR and Raman spectroscopy, circular dichroism (CD), Differential Scanning Calorimetry (DSC), NMR and NMR imaging spectroscopy, SPR, FLIM, Confocal Microsopy, Fluorescence Microsopy and other spectroscopic techniques

(4) Lipid mixes (various lipids) and modifications with sterol additives, liposomal system

(5) Small molecule additives (various small molecules e.g., thiadiazoles, coumarins, Hybrid systems of small molecules, molecular sensors and other compounds which change their physiochemical properties upon the interactions with lipid system)

(6) Various nanoparticle-based additives

(7) Membrane peptides and proteins

(8) Various micellar systems

(9) Ratiometric detection of the selected ions

(10) Solid state fluorescence in amorphous forms and crystals

(11) Structural modifiactions leading to novel derivatives, which demonstrate the dual fluorescence

(12) Biological activity of molecules which demonstrate the dual fluorescence

Dr. Arkadiusz Matwijczuk
Dr. Dariusz Karcz
Guest Editors

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• dual fluorescence/non-typical
• molecular spectroscopy
• liposomal and micelar systems
• various nanoparticle-based additives
• solid state fluorescence in amorphous forms and crystals
• biological activity of molecules which demonstrate the dual fluorescence