Synthesis of β-cyclodextrin-modified carbon nanocrystals and their fluorescent behavior

Abstract

Water-soluble β-cyclodextrin (β-CD)-modified carbon nanocrystals (CNCs) have been synthesized by the reaction of CNCs with mono(6-diethylenetriamino-6-deoxy)-β-CD (DETA-β-CD) and comprehensively characterized by 1 H NMR, FT-IR, transmission electron microscopy (TEM) and UV-Vis. DETA-β-CD-modified CNCs (DETA-β-CD-CNCs) are luminescent, and the quantum yield is 8.41%. The photoinduced electron transfer (PET) process between DETA-β-CD-CNCs and (ferrocenylmethyl) trimethylammonium iodide (Fc + ) was investigated by means of fluorescence spectroscopy. carbon nanocrystals, β-cyclodextrin, supramolecular chemistry, fluorescence Citation: Jiang Q, Zhang H Y, Liu Y. Synthesis of β-cyclodextrin-modified carbon nanocrystals and their fluorescent behavior. Fluorescent carbon nanocrystals (CNCs) [1-14] are quantum-sized carbon analogues used as biomarkers, bioimaging and bioprobes. CNCs are carbon-based nanomaterials, comparable to fullerenes, carbon nanotubes, graphite and nanodiamonds, which possess fluorescent properties. They are monodispersed in aqueous solution with a scale of 2-10 nm and have high photostability fluorescence. Compared with such semiconductor nanocrystals as CdSe [15], CdTe [16], and CdSe/ZnSe [17], CNCs have lower toxicity to human health or to the environment. As a result, CNCs may be suitable for various applications in chemistry and biology.Cyclodextrins (CDs) are a class of cyclic oligosaccharides with generally 6-8 D-glucose units linked by α-1,4-glucose bonds. They have the ability to selectively bind various inorganic or organic guests, which leads to widespread applications of CDs not only in pharmaceutical chemistry, food technology, analytical chemistry, chemical synthesis, and catalysis [18][19][20][21][22][23][24][25], but also for constructing molecular devices and machines [26][27][28][29][30][31]. Therefore, the combination of CNCs with CDs might yield valuable future applications. Here, we *Corresponding author (email: yuliu@nankai.edu.cn) prepared mono(6-diethylenetriamino-6-deoxy)-β-cyclodextrin (DETA-β-CD) modified CNCs (DETA-β-CD-CNCs), which have been characterized by 1 H NMR, FT-IR, transmission electron microscopy (TEM) and UV-Vis, and investigated the photoinduced electron transfer (PET) process between DETA-β-CD-CNCs and (ferrocenylmethyl) trimethylammonium iodide (Fc + ) by means of fluorescence. Importantly, 1-adamantanecarboxylic acid sodium salt (Ad -) could modulate the PET process between CNCs with Fc + .

A selective sensor for cyanide ion (CN−) based on the inner filter effect of metal nanoparticles with photoluminescent carbon dots as the fluorophore

“…Very recently, we proposed to prepare photoluminescent carbon dots from one-pot hydrothermal treatment of bee pollen in a highly reproducible way [8]. Apart from synthesis, the carbon dots are used for sensing of metal ions [9], optical bioimaging [10], photocatalysis [11], and photo-induced electron transfer (PET) [12]. Few studies on the detection of toxic anions based on carbon dots have been conducted [13][14][15].…”

Surface Engineering of MoS2 Quantum Dots via Cyclodextrin-Based Host–Guest Chemistry as Versatile Platforms for Enhanced Cell Imaging Application

“…Thus, the increase of the 2H phase in β-CD-MoS 2 QDs compared with pristine QDs, as supported by the XPS analysis (Figure d), may contribute to the fluorescence enhancement. Meanwhile, the effect of surface ligands on the surface states of QDs due to the distinct structure of β-CD compared with the original ligand (ethylene glycol) may also play an important role. − It is also worth noting that the optical properties of these MoS 2 QDs are significantly different from S QDs, suggesting a high purity of as-synthesized MoS 2 QDs. , …”

Fluorescent Carbon Dots and Nanodiamonds for Biological Imaging: Preparation, Application, Pharmacokinetics and Toxicity

“…It has been proved effective on different sources of carbon soots or by different organic moieties [12,[17][18][19][20][21][22][23][24][25]. Poly (ethylene glycol) (PEG) is a very popular agent taken in this approach.…”