scholarly journals Carborane–stilbene dyads: the influence of substituents and cluster isomers on photoluminescence properties

2017 ◽  
Vol 46 (7) ◽  
pp. 2091-2104 ◽  
Author(s):  
A. Ferrer-Ugalde ◽  
J. Cabrera-González ◽  
E. J. Juárez-Pérez ◽  
F. Teixidor ◽  
E. Pérez-Inestrosa ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Carbon Cluster ◽  
Photoluminescence Properties ◽  
Cluster Atom ◽  
Influence Of Substituents

A family of stilbene-containing meta- and ortho-carborane derivatives substitute at the second carbon cluster atom are synthesised and their photophysical properties evaluated.

scholarly journals Indenopyrans – synthesis and photoluminescence properties

2016 ◽  
Vol 12 ◽  
pp. 825-834 ◽  
Author(s):  
Andreea Petronela Diac ◽  
Ana-Maria Ţepeş ◽  
Albert Soran ◽  
Ion Grosu ◽  
Anamaria Terec ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Band ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Band Broadening ◽  
Photoluminescence Properties ◽  
Fluorescence Quantum Yields ◽  
Blue Emitters ◽  
Solid State Fluorescence

New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.

Synthesis and Characterization of Luminescent Rod-Coil Poly[2,7-(9,9- Dihexylfluorene)] - Block-Poly(2-(Dimethylamino) Ethyl Methacrylate) by Atom Transfer Radical Polymerization

2008 ◽  
Vol 47-50 ◽  
pp. 642-645
Author(s):  
Yang Yen Yu ◽  
Wen Chen Chien ◽  
Chia Liang Tsai
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Photophysical Properties ◽  
Mixed Solvents ◽  
Solvent System ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Ethyl Methacrylate ◽  
Large Compound

The synthesis, morphology, and photophysical properties of Poly[2,7-(9,9-dihexyl fluorene)]- block-poly(2-(Dimethylamino) ethyl methacrylate) (PF-b-PDMAEMA) copolymers in various mixed solvents, i.e., THF/MeOH, DMF/MeOH, and 1,4-Dioxane/MeOH, with methanol contents of 0, 10, 25, 50, 75, 90 vol.% were reported. TEM images showed that different aggregate morphologies of PF-b-PDMAEMA, including spherical and large compound micelles, cylinder, nanorods, long stick-like structure, could be prepared by introducing different amount of methanol into the copolymer/solvent system. The results indicated that aggregate morphologies of PF-b-PDMAEMA, which obtained from various coil lengths and mixed solvents, had a great influenced on the optical and photoluminescence properties of the prepared PF-b-PDMAEMA copolymers.

Polynuclear Cu(i) and Ag(i) phosphine complexes containing multi-dentate polytopic ligands: syntheses, crystal structures and photoluminescence properties

2019 ◽  
Vol 48 (2) ◽  
pp. 741-750 ◽  
Author(s):  
Jing Xiang ◽  
Shun-Cheung Cheng ◽  
Xin-Xin Jin ◽  
Qian-Qian Su ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Photophysical Properties ◽  
Photoluminescence Properties ◽  
Phosphine Complexes

A series of polynuclear Cu(i)/Ag(i) complexes have been obtained on the basis of three polytopic ligands. Their structures and photophysical properties have been investigated in detail.

Transition metal based single chained surfactants: synthesis, aggregation behavior and enhanced photoluminescence properties of fluorescein

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108573-108582 ◽  
Author(s):  
Preeti Garg ◽  
Gurpreet Kaur ◽  
Ganga Ram Chaudhary
Keyword(s):  
Transition Metal ◽  
Photophysical Properties ◽  
Aggregation Behavior ◽  
Photoluminescence Properties ◽  
Enhanced Photoluminescence ◽  
Counter Ion ◽  
Aggregation Behaviour

Four different transition metal based surfactants were synthesized. The effect of presence of metal as a part of counter ion on the aggregation behaviour of metallosurfactants and on the photophysical properties of fluorescein was explored.

scholarly journals Synthesis and Characterization of Multifunctional Chiral and Photoactive Organic-Inorganic Block Copolymers of Poly(methylphenylsilane) with (R)-N-(1-phenylethyl)methacrylamide, Disperse Red 1 Methacrylate and Their optical and Photophysical Properties

2018 ◽  
Author(s):  
Km. Meenu ◽  
Dibyendu S. Bag ◽  
Rekha Lagarkha ◽  
Radha Tomar ◽  
Arvind Kumar Gupta
Keyword(s):  
Photophysical Properties ◽  
Visible Region ◽  
Photoluminescence Property ◽  
Secondary Amide ◽  
Inorganic Polymers ◽  
Photoluminescence Properties ◽  
Optical Absorbance ◽  
Stretching Vibration ◽  
Disperse Red 1 ◽  
Code Identification

Now-a-days, the thrust area of materials’ research is to develop multifunctional materials, which have multiple properties in a single functional material. We are interested to develop multifunctional polysilanes having special functional properties such as optical activity and photoluminescence (PL) properties. In this investigation, poly(methyl phenyl silane) (PMPS) was integrated with a chiral unit and a photoactive unit by in situ photopolymerization of  (R)-N-(1-phenyl ethyl) methacrylamide (R-NPEMAM) and disperse red 1 methacrylate (DR1MA) monomer in the presence of PMPS. PMPS acted as a macrophotoinitiator and by UV exposure it produced macroradicals which initiated polymerization of chiral and photoactive monomers. Thus a block copolymer of PMPS-b-(R-NPEMAM-ran-DR1MA) was synthesized.The synthesized multifunctional organic inorganic hybrid polymer samples were characterized by FTIR and NMR spectroscopy. The molecular weights of the samples were measured by GPC analysis. The optical, chiroptical and photoluminescence properties were studied. The narrow band at about 1638 cm-1 is due to C=O stretching vibration of -CONH- of the chiral unit.  A wide absorption peaks at 3444 cm-1 is the characteristic of NH trans stretching vibration of secondary amide group. The asymmetric stretching of NO2 group appeared at 1481 cm-1 and the characteristic peak at 1427 cm-1 was observed due to azo (-N=N-) group stretching of DR1MA unit. The Si-Si band of PMPS appeared at about 462 cm-1 in FTIR spectra. The optical absorbance observed at 272 nm is due to π-π* transition of aromatic ring and at 330 nm corresponds to σ-σ* transition of Si-Si bond. The other electronic absorption observed in the visible region at 475 nm corresponds to the combined contribution of n-π* and π-π* transition of DR1MA unit. The photoluminescence properties of such polymers were studied for the variation of concentration of the polymer solution and variation with excitation energy such as 275 nm, 325 nm and 475 nm in THF solvent. Such synthesized multifunctional photoactive organic-inorganic polymers having unusual optical, chiroptical and photoluminescence property may find novel optoelectronic (friend foe identification and secretive code identification) applications.

Structural Properties of Ruthenium Biimidazole Complexes Determining the Stability of their Supramolecular Aggregates

2010 ◽  
Vol 65 (3) ◽  
pp. 281-290 ◽  
Author(s):  
Nils Rockstroh ◽  
Katrin Peuntinger ◽  
Helmar Görls ◽  
Dirk M Guldi ◽  
Frank W. Heinemann ◽  
...  
Keyword(s):  
Structural Properties ◽  
Ruthenium Complex ◽  
Photophysical Properties ◽  
Visible Range ◽  
X Ray ◽  
Bond Lengths ◽  
Amine Function ◽  
The Stability ◽  
Supramolecular Aggregates ◽  
Influence Of Substituents

The results of a detailed investigation of the influence of substituents in a variety of ruthenium biimidazole-type complexes [Ru(R-bpy)2(R´-bi(bz)imH2)]2+ (R = H, tBu; R´ = H,Me; bi(bz)imH2 = 2,2´-bi(benz)imidazole) on selected structural and photophysical properties is reported. The photophysical properties are only marginally influenced by the substituents at the bipyridine and the biimidazole core. All complexes show intense absorptions in the visible range of the spectrum with maxima around 475 nm, and emission from the formed excited state occurs at wavelengths between 650 and 670 nm. The comparison of structural properties determined by X-ray analysis within a series of related complexes shows that the Ru-N bond lengths to the coordinated bipyridines are not significantly influenced by the substituents, but slight differences in the Ru-N bond lengths to the biimidazole-type ligands can be detected. The reactions between ruthenium complexes containing different biimidazole-type ligands with the sulfate dianion, however, show a strong correlation between the substituents at the biimidazole core and the solubility of the product. The bibenzimidazolecontaining complexes precipitate from aqueous solution whereas the ruthenium complex containing unsubstituted biimidazole stays in solution. The solid-state structure of one example of the sulfatecontaining products (2b) shows that strong hydrogen bonds between the secondary amine function of the bibenzimidazole and the oxygen functionalities of the sulfate contribute to this unexpected behavior.

Influence of substituents in the phenyl ring on photophysical properties of 3-[2-(phenyl)benzoxazol-5-yl]alanine derivatives

2005 ◽  
Vol 175 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Katarzyna Guzow ◽  
Justyna Zielińska ◽  
Kamil Mazurkiewicz ◽  
Jerzy Karolczak ◽  
Wiesław Wiczk
Keyword(s):  
Phenyl Ring ◽  
Photophysical Properties ◽  
Influence Of Substituents
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