Interaction of Polymethine Dyes with Detonation Nanodiamonds

Abstract

Among cationic, anionic, and merocyanine polymethine dyes, the binding to detonation nanodiamond (DND) colloid particles in hydrosol occurs only for negatively charged dye species. This, in view of the positive ζ‐potential of the DND used in this study, suggests the predominance of electrostatic interactions over other intermolecular forces in such systems. Indeed, after decorating the merocyanine and the cationic dye by one and two negatively charged sulfopropyl groups, respectively, so that the net charge of their colored species becomes negative, the compounds also demonstrate affinity to the DND particles. In all cases, the binding of dyes to DND is accompanied by a decrease in fluorescence intensity and a bathochromic shift of their absorption and fluorescence bands. A quantitative study of the dyes adsorption on the DND nanoparticles as performed using the Küster‐Freundlich and Langmuir equations reveals some peculiarities of their attaching to the DND aggregates and allows estimating the specific area of the DND particles at a concentration of 0.0212 wt/vol %.

Spectral-Luminescence and Lasing Properties of Merocyanine Dye Solutions in the Presence of Silver Nanoparticles

“…It was also found that the lasing threshold can be lowered and the quality of generation of laser radiation can be improved in cationic polymethines by using the localized plasmon resonance of noble metal nanoparticles (NPs) [5]. Nanoparticles can also have a significant effect on the photophysical properties of neutral polymethines, such as merocyanine dyes [6], as was shown recently [7,8]. However, in spite of this, merocyanines have not been studied as active laser media in the presence of NPs.…”

Synthesis and Spectral Properties of Highly Fluorescent Nitrogen-Containing Graphene-Type Structures

“…Нормовані спектри флюоресценції ВКТ1 за різних довжин хвилі збудження ( exc ). 3 СИНТЕЗА ТА СПЕКТРАЛЬНІ ВЛАСТИВОСТІ ÔЛЮОРЕСЦЕНТНИХ СТРÓКТÓР 645 перспективною методою одержання світлоперетворювальних матеріалів з новими корисними властивостями [9][10][11]. Ó даній роботі ми дослідили можливу взаємодію ВКТ з трьома поліметиновими барвниками 1, 1a та 2:…”

Porphyrin–Nanodiamond Hybrid Materials—Active, Stable and Reusable Cyclohexene Oxidation Catalysts

“…As a result of the production method (detonation), the sp 3 diamond core is always covered with a few layers of sp 2 carbon. This allows surface functionalization, allowing the formation of electrostatic [4][5][6] or covalent linkages, and facilitating the preparation of hybrid organic-nanodiamond materials [7,8]. This has greatly contributed to a widespread application of these organic-nanodiamond carbon materials [9][10][11][12][13][14], in biomedicine [15][16][17][18], nonlinear optical materials [19,20], energy devices [21,22] and tribology [23,24].…”

“…Among the several hybrids consisting of ND and organic materials, we highlight those bearing tetrapyrrolic macrocycles, such as porphyrins [25] and phthalocyanines [1][2][3][4][5][6]. These are compounds with unique properties, used in a large range of biomedical applications [26][27][28][29] and as highly efficient catalysts in a variety of reactions [30,31].…”