Growth, structural, thermal, dielectric and optical studies on HBST crystal: A potential THz emitter

Crystal Growth, Physicochemical Investigation, and Raman Spectroscopy: Exploration of Intramolecular Charge Transfer in NLO Chromophore DAST

“…The analysis of FTIR spectra holds a pivotal role as it provides valuable insights into molecular vibrations, greatly aiding our comprehension of the physical and chemical properties of molecules and solid materials . Through this investigation, we gain a deeper understanding of intermolecular interactions, the intricate interplay amid molecular structure, hyperpolarizability, and nonlinear response, all of which have a substantial influence on the linear electro-optic behavior of organic molecules . Both experimental and theoretical approaches were employed in our FTIR analysis, as depicted in Figure a,b.…”

“…13 Through this investigation, we gain a deeper understanding of intermolecular interactions, the intricate interplay amid molecular structure, hyperpolarizability, and nonlinear response, all of which have a substantial influence on the linear electro-optic behavior of organic molecules. 14 Both experimental and theoretical approaches were employed in our FTIR analysis, as depicted in Figure 3a,b. This analysis serves as the cornerstone for discerning vibration modes within the DAST molecule, distinguishing those associated with the toluene sulfonate (negatively charged) anion and the stilbazolium (positively charged) cation.…”

Recent Advances in the Asymmetric Growth of Organic Polar Crystals: A Review

“…Subsequently, various DAST derivatives were developed to optimize the molecular polarity and alignment in crystals by changing the structure of anions or cations. For example, HBST with a p -hydroxystilbazolium cation and DSMOS with a p -methoxybenzenesulfonate anion . However, the difficulties in growing large-size and high-quality crystals, easy deliquescence, and undesirable absorptions of THz greatly restrict the practical application of DAST and its derivatives. , Hence, the search for new organic ionic NLO crystals by molecular engineering is of great importance.…”

4-[4-(4-Methoxyphenyl)-1,3-butadienyl]-1-methylpyridinium 4-chlorobenzene sulphonate (MBMPCBS) – an efficient nonlinear optical crystal with superior thermal stability

“…25,26 Particularly in DAST derivatives, when the dimethylamino functional group is replaced with a methoxy group the resulting molecule called 4-methoxy benzaldehyde- N -methyl 4-stilbazolium tosylate (MBST) exhibits a similar high thermal stability that is the difference between the melting point and the decomposition temperature, which increases drastically. 27,28 This thermal stability however comes with a price, it decreases the hyperpolarizability of MBST, causing a dilemma of either high thermal stability or high NLO. In order to maintain this temperature difference and also to have high nonlinear optical properties equal to or more than that of DAST, we propose to design a molecule with a methoxy functional group as the electron donor and increase the π conjugation length of the chromophore to overcome the problem of thermal stability and NLO properties.…”