Naphtho- and anthra-disilacyclobutadienes

2020 ◽  
Vol 56 (95) ◽  
pp. 15072-15075
Author(s):  
Shintaro Ishida ◽  
Shohei Sugawara ◽  
Shunya Honda ◽  
Takeaki Iwamoto
Keyword(s):  
Hypsochromic Shift

Naphthodisilacyclobutadiene and anthradisilacyclobutadiene exhibit a paratropic character due to the fused 1,2-disilacyclobutadiene moiety and a hypsochromic shift despite π-elongation.

Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

1998 ◽  
Vol 519 ◽  
Author(s):  
Y. Yan ◽  
Z. Duan ◽  
D.-G. Chen ◽  
S. Ray Chaudhuri
Keyword(s):  
Sol Gel ◽  
Hybrid Coating ◽  
Hypsochromic Shift ◽  
Hybrid Films ◽  
Coating Films ◽  
Organic Pigment ◽  
Inorganic Hybrid ◽  
Matrix Interactions ◽  
Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

scholarly journals Synthesis and Optical Performances of a Waterborne Polyurethane-Based Polymeric Dye

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xianhai Hu ◽  
Xingyuan Zhang ◽  
Jin Liu
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Waterborne Polyurethane ◽  
Average Particle ◽  
Particle Sizes ◽  
Hypsochromic Shift ◽  
Absorption Bands ◽  
Polymeric Dye ◽  
Emulsion Particle ◽  
Increasing Temperature

A waterborne polyurethane-based polymeric dye (WPU-CFBB) was synthesized by anchoring 1, 4-bis(methylamino)anthraquinone (CFBB) to waterborne polyurethane chains. The number molecular weight, glass transition temperature, and average emulsion particle size for the polymeric dye were determined, respectively. This polymeric dye exhibited intriguing optical behaviors. The polymeric dye engendered two new absorption bands centered at about 520 nm and 760 nm if compared with CFBB in UV-vis spectra. The 760 nm peak showed hypsochromic shift with the decrease of average particle sizes. The polymeric dye dramatically demonstrated both hypsochromic and bathochromic effects with increasing temperature. The fluorescence intensity of the polymeric dye was much higher than that of CFBB. It was found that the fluorescence intensities would be enhanced from 20°C to 40°C and then decline from 40°C to 90°C. The fluorescence of the polymeric dye emulsion was very stable and was not sensitive to quenchers.

scholarly journals New photochromic salt spiropyrans of indoline series

2019 ◽  
Vol 484 (6) ◽  
pp. 698-702
Author(s):  
A. D. Pugachev ◽  
M. B. Lukyanova ◽  
V. V. Tkachev ◽  
B. S. Lukyanov ◽  
N. I. Makarova ◽  
...  
Keyword(s):  
Absorption Band ◽  
Diffraction Analysis ◽  
Hypsochromic Shift ◽  
X Ray Diffraction ◽  
Photochromic Properties ◽  
Photoinduced Form ◽  
X Ray ◽  
Long Wavelength

The synthesis and study of the structure and photochromic properties of the new salt spiropyrans of the indoline series containing chlorine and bromine atoms as a substituent at the 6' position in 2H-chromene moiety are presented. The structure of the obtained compounds was confirmed by NMR 1H spectroscopy and X-ray diffraction analysis. The compounds are photochromic; the long-wavelength maximum of the absorption band of their open photoinduced form has a significant hypsochromic shift, and the lifetime substantially increases in comparison with the fluorine analog.

scholarly journals SYNTHESIS AND SPECTRAL CHARACTERISTICS OF PERSPECTIVE NANOSIZED CARBON QUANTUM DOTS FOR ADSORPTION AND CATALYTIC PROCESSES

2020 ◽  
Vol 86 (1) ◽  
pp. 3-11
Author(s):  
Volodymyr Ogenko ◽  
Svitlana Orysyk ◽  
Ljudmila Kharkova ◽  
Oleg Yanko
Keyword(s):  
Quantum Dots ◽  
Bathochromic Shift ◽  
Spectral Characteristics ◽  
Carbon Quantum Dots ◽  
Hypsochromic Shift ◽  
Absorption Bands ◽  
Rhodium Chloride ◽  
Electron Transitions ◽  
Trivalent State ◽  
Adsorption Processes

Processes of interaction between carbon quantum dots (CQDs) and solutions of rhodium, ruthenium and palladium chlorides in the surface layer have been investigated by electron and IR spectroscopy. When rhodium chloride is added to a solution of CQDS, a bathochromic shift of the β- and p-absorption bands (ABs) at 48725 and 41711 cm-1 as well as hypsochromic shift of the α-AB at 28935 cm-1 indicate that rhodium adsorption occurs on the surface of CQDs. The bathochromic shift of the absorption bands at 22400 сm1 together with the hypsochromic shift of ABs corresponding to d-d electron transitions in the metal ions indicates the formation of rhodium with CQDs. When ruthenium and palladium chlorides are added to an aqueous solution of CQDs, the intensive of ABs characterizing the complex anions [RuCl6]3-, [RuCl6]2- or [PdCl4]2- are absent in the UV-Vis spectra. This indicates the passage of adsorption processes of metals on the surface of CQDs.  The present of ABs (at 27055 and 25125 сm-1) indicate the trivalent state of ruthenium ion; the p-ABs bathochromic shift as well as α-ABs hypsochromic shift indicates the probable complex formation of CQDs with Ru3+ ions. The change in the position of the absorption bands of d-d electron transitions (at 25448 сm1) together with the bathochromic shift of p-ABs and hypsochromic shift of α-ABs indicates a change in coordination environment in the palladium ion with the possible formation of Pd → N bond. The IR-spectra data of CQDs showed the presence of a number of characteristic ABs for functionalized CQDs: ν(N–H) at 3260 сm1, (C=O) at 1830, 1840 and 1850 сm1, –С=O(NH) at 1770 сm1, ν(C=N) at 1680 and δ(N–H) at 1640 сm1, which confirms the coordination of metals on the surface of CQDs.

Acid-induced degradation of widely used NIR dye DiR causes hypsochromic shift in fluorescence properties

2019 ◽  
Vol 132 ◽  
pp. 27-33 ◽  
Author(s):  
Markus Riehl ◽  
Meike Harms ◽  
Benedikt Göttel ◽  
Holger Kubas ◽  
Dirk Schiroky ◽  
...  
Keyword(s):  
Fluorescence Properties ◽  
Hypsochromic Shift ◽  
Nir Dye

Schwingungs-und Elektronenspektren der bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV) / Vibrational and Electronic Spectra of Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV)

1988 ◽  
Vol 43 (4) ◽  
pp. 371-381 ◽  
Author(s):  
K. Bütje ◽  
W. Preetz
Keyword(s):  
Charge Transfer ◽  
Vibrational Spectra ◽  
Near Infrared ◽  
Bathochromic Shift ◽  
Infrared Region ◽  
Hypsochromic Shift ◽  
Linkage Isomers ◽  
Near Infrared Region ◽  
Ir And Raman ◽  
Metal Ligand

AbstractWell-resolved IR and Raman spectra of the two sets of all 10 isomeric complexes [Os(NCS)n(SCN)6-n]3-/2-, n = 0-6, have been recorded. For both series, νCS(N) > νCS(S) and δNCS > δSCN; for the Os(III) complexes, vCN(N) ~ vCN(S) and vOsN ≥ vOsS while for the Os(IV) compounds, vCN(N) < vCN(S) and vOsN ~ vOsS. The vibrational spectra of the n = 0 and n = 6 members of both sets are assigned according to D3d and Oh point symmetry, respectively. For the mixed linkage isomers the band pattern is strongly influenced by pseudo-octahedral coupling wherever frequencies of N- and S-bonded groups coincide. The metal-ligand stretching region is therefore assigned according rather to pseudo-Oh, pseudo-D3d and pseudo-D4h symmetry than to D4h, C4v, C3v and C2v microsymmetry. The charge-transfer spectra of both series are similar, showing a parallel hypsochromic shift with increasing n value. Upon oxidation, a bathochromic shift of the CT bands by an average of 5400 cm-1 is observed, and the intensity increases by a factor 2-2.5. Weak absorptions in the near infrared region are assigned to intraconfigurational transitions.

Strong emission of 2,4,6-triphenylpyridine-functionalized polytyrosine and hydrogen-bonding interactions with poly(4-vinylpyridine)

2015 ◽  
Vol 6 (35) ◽  
pp. 6340-6350 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Fang-Hsien Lu ◽  
Jin-Long Hong ◽  
Shiao-Wei Kuo
Keyword(s):  
Hydrogen Bonding ◽  
Emission Intensity ◽  
Hypsochromic Shift ◽  
Strong Emission ◽  
Hydrogen Bonding Interactions ◽  
Intramolecular Rotation

The emission intensity of Pyridine-PTyr decreased after blending with P4VP and underwent a hypsochromic shift from 536 to 489 nm due to the release of the restricted intramolecular rotation of the triphenyl pyridine unit in the center of the polymer.

Multifunctionalized octamethoxy-[8]cycloparaphenylene: facile synthesis and analysis of novel photophysical and photoinduced electron transfer properties

2019 ◽  
Vol 6 (11) ◽  
pp. 1885-1890 ◽  
Author(s):  
Shengsheng Cui ◽  
Guilin Zhuang ◽  
Jinyi Wang ◽  
Qiang Huang ◽  
Shengda Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Emission Spectrum ◽  
Photoinduced Electron Transfer ◽  
Photophysical Properties ◽  
Hypsochromic Shift ◽  
Facile Synthesis ◽  
Electron Transfer Properties ◽  
Transfer Properties

A novel multifunctionalized carbon nanoring was facilely synthesized, which demonstrates an unusual hypsochromic shift in the emission spectrum with interesting photophysical properties.

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