Fine Tuning of the Electronic Properties of Novel BTPE Using Oligosilanyl Linkages and Their Application in Rapid High-Resolution Visualization of Latent Fingerprints

Abstract

Structural modifications through π-interactions usually result in redshifts in luminescence and, as a consequence, the loss of the natural color of the chromophore. Besides, employing Si-Si σ-bridging to manipulate the electronic properties of organic materials has remained largely unexplored. Herein, we report a series of novel bis-tetraphenylethenes (BTPEs) with oligosilanyl linkages, termed BTPE-Sin molecules, used to manipulate the photophysical properties of luminogens subtly through σ-π conjugation. These oligosilanyl-bridged molecules were thermally, highly stable, and exhibited enhanced aggregation-induced emissions, as well as luminescence efficiencies while retaining most of their original color. Our current BTPEs fabrications have easy-to-operate, fast, and high-resolution identification properties toward LFPs. Also, they are highly specific to individuals, and hence, vital in forensic investigations. We achieved these features through the introduction of oligosilanyl chains that increased the lipophilicity of the significantly. This work offers a universal and straightforward approach for the generation of highly emissive organic materials and enables fine-tuning of their electronic properties for multifunctional applications.

Study the synthesis and the properties of self‐crosslinking acrylic latex via a novel fluorescent labeling method

“…However, after all the pre‐mixture emulsion being added in, the peak position of PL spectra red shifted to 480 nm and its intensity enhanced more than tenfold, the phenomenon happened in a very short time with the reaction carrying on, which might tell us the auto acceleration effect 21 happened with high‐density of reacting monomers and enough free radicals initiators in the micelles. We have proposed that restriction of intramolecular rotation (RIR) is the main cause for the AIE phenomenon 22 when AIEgen and monomers are knitted together by covalent bonds to form polymer chains during emulsion process, the RIR process will partially activate. This restriction blocks the nonradiative pathway and opens up the radiative channel, 23 and thus make the synthesized acrylate emulsion somewhat emissive.…”

Novel Germoles and Their Ladder-Type Derivatives: Modular Synthesis, Luminescence Tuning, and Electroluminescence

“…The intramolecular rotation is restricted in solid state due to the involved physical constraint. [28][29][30] Notably, PL wavelength of benzogermoles in the deep-blue and blue regions could be precisely modulated for every 10 nm (Table 1), which highlights the excellent luminescence control. To validate the AIE characteristics, PL behaviors of 5c-5f in the aggregated state were investigated, as shown in Supporting…”

Oligosilanyl-Bridged Biscarbazoles: Structure, Synthesis, and Spectroscopic Properties

“… 10 , 11 It is a remarkable fact that the oligosilane-containing materials exhibit superior performance to some extent compared with the π-bridged system. 12 …”

“…10,11 It is a remarkable fact that the oligosilane-containing materials exhibit superior performance to some extent compared with the πbridged system. 12 Carbazole-based compounds have attracted considerable attention as hole-transporting and light-emitting materials in scientific and industrial fields. 13 Carbazole derivatives are usually employed as an electronic-donor group and they exhibit good absorption and fluorescence.…”

“…Introducing silicon bridges in π-conjugated systems has been proven to be a promising way to modulate the electronic properties. − This can allow functionality to be fine-tuned through the orbital interaction between the σ-orbital of silicon and the π-orbital of π-electron systems. , Besides, the highly flexible nature of the Si–Si chain makes the molecule more soluble in common organic solvents and less possible to stack under concentrated conditions, which is beneficial for their practical application and the improvement of emission efficiency in the solid state. Oligosilanyl derivatives have been utilized as novel electronic and optical molecular materials, such as nonlinear optic materials, hole-transporting materials, and emitters in organic light-emitting diodes (OLEDs). , It is a remarkable fact that the oligosilane-containing materials exhibit superior performance to some extent compared with the π-bridged system …”