NLOphoric studies in thiazole containing symmetrical push–pull fluorophores – Combined experimental and DFT approach

Enhancement of NLO Properties in OBO Fluorophores Derived from Carbazole–Coumarin Chalcones Containing Carboxylic Acid at the N-Alykl Terminal End

“…All dye solutions (0.5 mM) were subjected to Z-scan measurement, wherein a 532 nm Nd/YAG laser having 5 ns pulses at a repetition rate of 10 Hz was used. The microscopic parameters β, n 2 , and χ (3) of 5, 6, 7, and 8 were evaluated by Z-scan.…”

“…The design and structure–property study of organic nonlinear optical (NLO) materials have been widely researched in the past few decades for a variety of applications, such as frequency mixing, − electro-optic modulation, , and second harmonic generation use in optical devices. , The advantages of organic NLOphores over the inorganic NLO materials like lithium niobate are the ease of synthesis, large optical nonlinearity, low cutoff wavelengths, short response time, high laser damage thresholds, good solubility, and compatibility with polymer matrix, which have brought the NLO research into the forefront. − Organic compounds with high conjugated π-electron system between electron donor and acceptor groups show good NLO properties with good thermal and photostabilities. The chalcones are one of the promising NLO candidates by virtue of their push–pull-type design consisting of D−π–A framework, with high absorption extinction coefficients in the UV region, good third-order nonlinearity, and good optical power-limiting property. − Chalcones have applications in optoelectronic devices, , information storage, optical switching, , electrochemical sensing, and Langmuir films …”

“…29−31 The nature of N-substituent influences the emission. The alkyl chain linked via sp 3 carbon to the 9 position of carbazole usually suppresses the association of dye, which leads to fluorescence quenching. Carbazole with easily derivatizable alykl carboxyl group shows good photoexposure delay, 32 acts as a derivatization reagent in high-performance liquid chromatography analysis, and forms metal complexes with Zn and Cd metal ions.…”

Theoretical Approach towards the Investigation of Linear and Second‐Order Nonlinear Optical Behavior of Ferrocene‐Diketopyrrolopyrrole Dyads

“…However, trial and error experimental approach has often been proven to be a costly proposition as it involves cumbersome synthesis and purification steps prior to the measurement of optical nonlinearity and related properties. An efficacious theoretical approach allowing prediction and analysis of β, prior to the mandatory synthesis and the associated purification and characterization steps, offers an attractive alternative for pre‐screening of the molecular designs . Additionally, calculation of β using a reliable theoretical approach would also offer an opportunity to undertake fine‐tuning of the molecular design of the chromophores expected to yield a higher β value.…”

2,2′-[(Disulfanediyl)bis{5-[(1E)-(2-hydroxybenzylidene)amino]-1,3-thiazole-4,2-diyl}]diphenol: synthesis, crystal structure and calculation of molecular hyperpolarizability

“…Schiff base organic compounds, which are usually obtained from the condensation reaction between primary amines with active carbonyl reagents, are promising candidates for displaying NLO properties due to their easy preparation, along with their electronically and structurally tunable characteristics through access to a large number of primary amines and carbonyl reagents (Holland et al, 2009;Dziembowska et al, 2009;Kessentini et al, 2013;Vigato et al, 2012;Rigamonti et al, 2006;Renuga & Muthu, 2014;Suvitha et al, 2014). Thiazole derivatives, which are synthesized from the condensation of dithiooxamide with aryl aldehyde substrates, can enhance the NLO properties of molecules (Telore et al, 2015;Thorat & Sekar, 2017). From a synthetic standpoint, the introduction of thiazole rings into the structures of Schiff base compounds is attractive as it could result in a combination of their features (Pietrangelo et al, 2008).…”