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31.
Samrat Ghosh Sreejith Shankar Divya Susan Philips Ayyappanpillai Ajayaghosh 《Materials Today Chemistry》2020
The very concept of dye and pigment chemistry that was long known to the industrial world underwent a radical revision after the discovery and commercialization of dyes such as mauveine, indigo, and so on. Apart from their conventional role as coloring agents, organic dyes, and pigments have been identified as indispensable sources for high-end technological applications including optical and electronic devices. Simultaneous with the advancement in the supramolecular chemistry of π-conjugated systems and the divergent evolution of organic semiconductor materials, several dyes, and pigments have emerged as potential candidates for contemporary optoelectronic devices. Of all the major pigments, diketopyrrolopyrrole (DPP) better known as the ‘Ferrari Pigment’ and its derivatives have emerged as a major class of organic functional dyes that find varied applications in fields such as industrial pigments, organic solar cells, organic field–effect transistors, and in bioimaging. Since its discovery in 1974 by Farnum and Mehta, DPP-derived dyes gained rapid attention because of its attractive color, synthetic feasibility, ease of functionalization, and tunable optical and electronic properties. The advancement in supramolecular polymerization of DPP-based small molecules and oligomers with directed morphological and electronic features have led to the development of high performing optoelectronic devices. In this review, we highlight the recent developments in the optoelectronic applications of DPP derivatives specifically engineered to form supramolecular polymers. 相似文献
32.
Anirban Dutta Sumit K. Dutta Samrat Das Adhikari Dr. Narayan Pradhan 《Angewandte Chemie (International ed. in English)》2018,57(29):9083-9087
High temperature colloidal synthesis for obtaining thermal, colloidal and phase‐stable CsPbI3 nanocrystals with near‐unity quantum yield is reported. While standard perovskite synthesis reactions were carried out at 160 °C (below 200 °C), increase of another ≈100 °C enabled the alkylammonium ions to passivate the surface firmly and prevented the nanocrystals from phase transformation. This did not require any inert atmosphere storage, use of heteroatoms, specially designed ligands, or the ice cooling protocol. Either at high temperature in reaction flask or in the crude mixture or purified dispersed solution; these nanocrystals were observed stable and retained the original emission. Different spectroscopic analyses were carried out and details of the surface binding of alkyl ammonium ligands in place of surface Cs in the crystal lattice were investigated. As CsPbI3 is one of the most demanding optical materials, bringing stability by proper surface functionalization without use of secondary additives would indeed help in wide spreading of their applications. 相似文献
33.
Arafat SN Dutta S Perring M Mitchell M Kenis PJ Bowden NB 《Chemical communications (Cambridge, England)》2005,(25):3198-3200
Mild methods to assemble well-ordered organic monolayers of olefins on Si(111) using 2,2,6,6-tetramethyl-1-piperidinyloxy and to pattern these monolayers on the micrometer-size scale using soft lithography are reported. 相似文献
34.
Unprecedented Charge‐Transfer Complex of Fused Diporphyrin as Near‐Infrared Absorption‐Induced High‐Aspect‐Ratio Nanorods
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B. Shivaprasad Achary Dr. Sabapathi Gokulnath Samrat Ghosh Madoori Mrinalini Dr. Seelam Prasanthkumar Dr. Lingamallu Giribabu 《化学:亚洲杂志》2016,11(24):3498-3502
Charge‐transfer (CT) complexes of near‐infrared absorbing systems have been unknown until now. Consequently, structural similarities between donor and acceptor are rather important to achieve this phenomenon. Herein, we report electron donors such as non‐fused diporphyrin‐anthracene (DP), zinc diporphyrin‐anthracene (ZnDP) and fused zinc diporphyrin‐anthracene (FZnDP) in which FZnDP absorbs in NIR region and permits a CT complex with the electron acceptor, perylene diimide (PDI ) in CHCl3 exclusively. UV/Vis‐NIR absorption, 1H NMR, NOESY and powder X‐ray diffraction analysis demonstrated that the CT complex formation occurs by π–π stacking between perylene units in FZnDP and PDI upon mixing together in a 1:1 molar concentration in CHCl3, unlike non‐fused ZnDP and DP. TEM and AFM images revealed that the CT complex initially forms nanospheres leading to nanorods by diffusion of CH3OH vapors into the CHCl3 solution of FZnDP/PDI (1:1 molar ratio). Therefore, these CT nanorods could lead to significant advances in optical, biological and ferroelectric applications. 相似文献
35.
Hansda Samrat Pandit Swapan K. Sheu Tony W. H. 《Journal of Thermal Analysis and Calorimetry》2022,147(12):7007-7029
Journal of Thermal Analysis and Calorimetry - In this paper, we have conducted a numerical investigation to investigate thermal and solutal performances of thermosolutal mixed convection flow in a... 相似文献
36.
Wilhelm C Boyd SA Chawda S Fowler FW Goroff NS Halada GP Grey CP Lauher JW Luo L Martin CD Parise JB Tarabrella C Webb JA 《Journal of the American Chemical Society》2008,130(13):4415-4420
Diiodobutadiyne forms cocrystals with bis(pyridyl)oxalamides in which the diyne alignment is near the ideal parameters for topochemical polymerization to the ordered conjugated polymer, poly(diiododiacetylene) (PIDA). Nonetheless, previous efforts to induce polymerization in these samples via heat or irradiation were unsuccessful. We report here the successful ordered polymerization of diiodobutadiyne in these cocrystals, by subjecting them to high external pressure (0.3-10 GPa). At the lower end of the pressure range, the samples contain primarily monomer, as demonstrated by X-ray diffraction studies, but some polymerization does occur, leading to a pronounced color change from colorless to blue and to the development of intense Raman peaks at 962, 1394, and 2055 cm-1, corresponding to the poly(diacetylene). At higher pressures, the samples turn black and contain primarily polymer, as determined by solid-state NMR and Raman spectroscopy. Both density functional theory calculations (B3LYP/LanL2DZ) and comparisons to authentic samples of PIDA have confirmed the data analysis. 相似文献
37.
This review provides an account of single-molecule fluorescence methodologies for freely diffusing molecules applied to a
diverse array of biological problems pertaining to biomolecular folding and assembly. We describe the principles of confocal
fluorescence microscopy to detect and analyze fluorescence bursts from diffusing single molecules. These methods including
single-molecule fluorescence resonance energy transfer, coincidence, correlations and polarization offer a powerful means
to uncover hidden information about conformational sub-populations and interconversion dynamics of biomolecular systems in
a wide range of timescales. We offer several key examples to illustrate how these methodologies have been extremely useful
in teasing out structural and dynamical aspects of many important biomolecular systems. 相似文献
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39.
Samrat Chatterjee 《Nonlinear Analysis: Real World Applications》2010,11(5):4415-4430
An eco-epidemiological model is considered where the prey population is migratory in nature. To incorporate the temporal pattern of the avian migration into the model, a time dependent recruitment rate was considered with a general functional response. In the numerical simulation we substitute the general functional response with Holling type-I and Holling type-II functional responses. It was observed that the qualitative behaviour of the system does not depend on the choice of the functional responses. The results showed that the system could be made disease free by either decreasing the contact rate or simultaneously increasing the predation and the recovery rate. Moreover, it was observed that the presence of an alternative food source for the predator population helps in the coexistence of all the species. 相似文献
40.
[reaction: see text] Avicholic acid, a major constituent of the bile of several avian species, was synthesized in eight steps from readily available chenodeoxycholic acid in 9% overall yield using Breslow's remote functionalization strategy in a key step. Micelle formation and equilibrium cholesterol solubilization properties were studied for avicholate in aqueous solution. 相似文献