Synthesis and Nonlinear Optical Properties of<i>p</i>-(Dimethylamino)benzylidene Dyes Containing Different Acceptors
作者:Qingdong Zheng、Zuguang Yao、Jiqi Cheng、Yaochun Shen、Zuhong Lu
DOI:10.1246/cl.2000.1426
日期:2000.12
Several p-(dimethylamino)benzylidene dyes were synthesized and their evaluation of β using Hyper-Rayleigh Scattering (HRS) technique was reported. The results show that these dyes have enhanced second-order hyperpolarizabilities.
Abstract A series of 5‐benzylidenerhodamine derivatives were synthesized by the cross‐aldol condensation of an aromatic aldehyde with rhodamine or rhodamine acetic acid in sodium acetate/acetic acid undermicrowaveirradiation. The reaction was completed in 8–20 min with 63–94% yields and was environmentally benign with easy workup.
Synthesis, characterisation and antibacterial studies of carbon nanoparticle and carbon nanoparticle encapsulated in functionally modified β-cyclodextrin with {5-[4-(dimethylamino) benzylidene]-4-oxo-2-thioxo-1, 3-thiazolidin-3-yl} acetic acid
作者:Sheena Varghese、Sunny Kuriakose
DOI:10.1080/10610278.2015.1107064
日期:2016.4.2
This paper describes the synthesis of carbon nanoparticle (CNP) from natural sources such as kitchen soot, synthesis of a chromophoric system 5-[4-(dimethylamino) benzylidene]-4-oxo-2-thioxo1, 3-thiazolidin-3-yl} acetic acid and its incorporation into -cyclodextrin (-CD) through the esterification of the hydroxyl group with the free carboxyl function of the chromophoric system by DCC coupling. Encapsulation of CNP into functionally modified -CD system was achieved. Characterisation of the products was undertaken by UV-visible, FT-IR, NMR, fluorescence spectroscopic methods, SEM, TEM and X-ray diffraction methods. Their antibacterial activities were addressed. The antibacterial activity of CNP and functionally modified -CD-CNP products were tested against various pathogenic bacterial strains such as Streptcoccus haemoliticus (+ve), Staphylococcus aureus (+ve), Klebsiella pneumonia (-ve) and E. coli (MTCC1687) (-ve) by disc diffusion method. The results showed that the CNPs and functionally modified products have good antibacterial activity against selected pathogenic bacterial strains.
Photophysical characterization of coumarin and rhodanine derivatives as viscosity sensitive fluorescence turn-on probes
作者:Bhanu Priya、Naresh Kumar、Roopa
DOI:10.1016/j.dyepig.2022.110707
日期:2022.11
showed a linear relationshipbetween fluorescence intensity (log I) and solvent viscosity (log η), with viscositysensitivity values of 0.554 and 0.996, respectively. The reported probes' fluorescence profiles were unaffected by the presence of metal ions or the pH of the solvent medium. Further studies suggest that the fluorescence quantum yield of these probes is dependent on both viscosity and temperature