CAS:621-96-5 | NSC 403525

Introduction of CAS:621-96-5 | NSC 403525

4,4'-Diaminostilbene is a compound used in various applications, particularly as a molecular linker in nanoparticle research and as a precursor in the synthesis of fluorescent brighteners.

Synthesis Analysis

4,4'-Diaminostilbene can be synthesized through multiple methods. One significant approach involves the condensation of 4,4'-Diaminostilbene-2,2'-disulphonic acid with different agents to produce various derivatives, as explored in studies like the synthesis of asymmetrically substituted derivatives for fluorescent brightening applications (Lee et al., 2005).

Molecular Structure Analysis

The molecular structure of 4,4'-Diaminostilbene derivatives has been extensively studied. For instance, the structure of tetrabutylammonium 4,4'-diaminostilbene-2,2'-disulphonate has been confirmed through single crystal X-ray diffraction, providing insights into its molecular geometry and interactions (Rader et al., 2007).

Specification of CAS:621-96-5 | NSC 403525

Research Application of CAS:621-96-5 | NSC 403525

Molecular Linker in Nanoparticle Aggregation

4,4'-Diaminostilbene (DAS) has been used as a molecular linker in the aggregation of silver nanoparticles. Research by Solovyeva et al. (2018) demonstrated that DAS effectively links Ag nanoparticles, creating hot spots for Surface Enhanced Raman Scattering (SERS). The study also explored the effects of different DAS concentrations, pH levels, and the presence of halide salts on the adsorption mechanism, offering a method for controlling the size and optical properties of Ag nanoparticle aggregates (Solovyeva et al., 2018).

Photochemistry and Photoisomerization

DAS's photochemical properties, particularly its fluorescence and direct trans-cis photoisomerization, are influenced by solvent polarity. Smit and Ghiggino (1985) found that increasing solvent polarity decreases fluorescence yield and lifetime, while increasing the rate of photoisomerization. This research aids in understanding the polarity effect on the energy barrier to photoisomerization of DAS (Smit & Ghiggino, 1985).

Fluorescent Probe Development

A hydrophilic trans-4,4'-diaminostilbene derivative was developed by Yao et al. (2006) for use as a fluorescent probe in biological imaging. The derivative's high aqueous solubility and significant fluorescence quantum yield make it suitable for applications in cellular imaging (Yao et al., 2006).

Single-Molecular-Wire Junctions in Nanotechnology

Widawsky et al. (2009) explored the use of DAS in nanotechnology, specifically in the measurement of electronic transport across amine-linked single-molecular-wire junctions. Their research revealed that DAS exhibits significant increases in differential conductance under applied bias, indicating its potential in electronic applications (Widawsky et al., 2009).

Fluorescent Brighteners and Textile Industry

DAS derivatives have been utilized as fluorescent brighteners in the textile industry. Modi (1993) synthesized derivatives of DAS for application on cotton and nylon fibers, demonstrating their effectiveness as brightening agents (Modi, 1993).

Environmental Applications

Guoliang (2005) discussed the treatment of wastewater from DAS acid manufacturing, highlighting the environmental significance of managing the waste produced in the production of DAS and its derivatives (Guoliang, 2005).

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