Synthesis, Electronic States, and Electroluminescent Properties of Aluminum Complex Based on Mixed Ligands with 8-Hydroxyquinolinate and Acetylacetone

2011 ◽  
Vol 306-307 ◽  
pp. 358-361
Author(s):  
Liu Qing Chen ◽  
Chun Yan Sun ◽  
Xu Guang Liu ◽  
Bing She Xu
Keyword(s):  
Fluorescence Spectra ◽  
Orbital Energy ◽  
Computational Studies ◽  
Absorption And Fluorescence Spectra ◽  
Aluminum Complex ◽  
Analysis Techniques ◽  
H Nmr ◽  
Mixed Ligands ◽  
Organic Electroluminescent ◽  
Electron Transport Properties

We report the synthesis, photophysical investigation, computational studies and electroluminescent(EL) properties of an organic electroluminescent material-Bis(8-hydroxyQuino line) acetylacetone aluminum (Alq2A). It is characterized by 1H NMR, IR and elemental analysis techniques. The absorption and fluorescence spectra of various Alq2A systems including solution in ethanol, powder and thin film on quartz (thickness of 50nm) have also been systematically evaluated. Analysis of the electronic structure of Alq2A calculated by quantum chemical calculations reveals a localization of orbital and the distribution of orbital energy. The results from EL experiments indicate that Alq2A has good electron transport properties as compared with tris(8-hydroxyquinolinato) aluminum (Alq3). Thus, Alq2A is considered to be a superior emitter and electron transporting material for display application compared with Alq3.

Synthesis, Characterization and Photophysical Properties of Rhenium(I) Complexes Containing 4,5-Diazafluorene Ligan

2011 ◽  
Vol 239-242 ◽  
pp. 2612-2615
Author(s):  
Jie Xiu Wang ◽  
Feng Zhao
Keyword(s):  
Charge Transfer ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Absorption And Fluorescence Spectra ◽  
Rhenium Complexes ◽  
H Nmr ◽  
Ligand Charge Transfer

Two related tricarbonyl rhenium complexes with the formula of [Re(CO)3(L)Cl], where L=4,5-diazafluoren-9-one (Dafo-Re) and 9-(phenylamino)-4,5-diazafluoren (PADF-Re) were successfully synthesized with the aim to explore the effect of the geometry of Dafo on Rhenium(I) coordination, and characterized by1H NMR. Photophysical behaviors are investigated by UV–vis absorption and Fluorescence spectra. The two complexes Dafo-Re and PADF-Re show metal-to-ligand charge transfer absorptions at ca.391nm, ca.394 nm and emissions at ca.492nm, ca.470nm, respectively.

A novel nitrogen-containing compound with D-π-A structure: theoretical and experimental study

2014 ◽  
Vol 92 (5) ◽  
pp. 411-416 ◽  
Author(s):  
Xiaoting Gong ◽  
Ziyan Zhou ◽  
Shuguang Zhang ◽  
Shuping Zhuo ◽  
Xiurong Huang ◽  
...  
Keyword(s):  
Density Functional ◽  
Fluorescence Spectra ◽  
Density Functional Theory Calculations ◽  
Absorption And Fluorescence Spectra ◽  
Functional Theory ◽  
H Nmr ◽  
Measured Absorption ◽  
Nmr Techniques ◽  
Good Agreement ◽  
C Nmr

2-(2-Hydroxy-styryl)-4,6-dimethyl-1,3,5-triazine (P1), a novel compound with D-π-A structure, possesses a variety of isomers. Density functional theory calculations were employed to explore the isomerization mechanisms of its various isomers at the 6-311+G** level. The calculated results show that the phenol configurations of compound P1 are more stable than the quinoid configurations, whether they exist as monomers, complexes, with methanol or dimers. The most stable structure of compound P1 was used to calculate the UV-vis and fluorescence spectra. To validate the calculated results, the title compound was synthesized and characterized by 1H NMR and 13C NMR techniques. The measured absorption and fluorescence spectra of P1 in methanol and N,N-dimethylformamide are in good agreement with the calculated ones.

scholarly journals Cytotoxicity of doxorubicin conjugated with C60 fullerene. Structural and in vitro studies

2019 ◽  
Vol 30 (6) ◽  
pp. 2327-2338
Author(s):  
Kamila Butowska ◽  
Witold Kozak ◽  
Magdalena Zdrowowicz ◽  
Samanta Makurat ◽  
Michał Rychłowski ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Fluorescence Spectra ◽  
C60 Fullerene ◽  
Absorption And Fluorescence Spectra ◽  
H Nmr ◽  
Low Toxicity ◽  
Pass Through ◽  
The Impact

Abstract Conjugating an anticancer drug of high biological efficacy but large cytotoxicity with a “transporting” molecule of low toxicity constitutes a valuable approach to design safe drug delivery system. In the present study, doxorubicin (DOX) a drug of large cardiotoxicity was chemically conjugated to a C60-fullerene. The synthesized molecule, a fullerene-doxorubicin conjugate (Ful-DOX), was characterized using the 1H NMR and MALDI TOF mass spectrometry. The absorption and fluorescence spectra and dynamic light scattering of the conjugate were recorded in an aqueous solution, while the impact on viability of several cancer cell lines of the free DOX and the conjugate was compared using the SRB and WST-1 assays. A low antiproliferative activity of the conjugate as compared to the free DOX is a consequence of the presence of fullerene moiety in the former, which is also responsible for the conjugate aggregation in an aqueous solution. Unlike free DOX, these aggregates cannot pass through the nuclear membrane (as demonstrated by the confocal microscopy measurements), which makes them marginally cytotoxic.

Cyclic butadiyne-linked porphyrin(2.1.2.1) oligomers

2020 ◽  
Vol 24 (01n03) ◽  
pp. 489-497 ◽  
Author(s):  
Daiki Kuzuhara ◽  
Wataru Furukawa ◽  
Naoki Aratani ◽  
Hiroko Yamada
Keyword(s):  
Cyclic Voltammetry ◽  
Nmr Spectroscopy ◽  
Fluorescence Spectra ◽  
Theoretical Calculations ◽  
Cyclic Structure ◽  
Absorption And Fluorescence Spectra ◽  
H Nmr ◽  
Reduction Potentials ◽  
Cyclic Trimer ◽  
Tof Ms

Cyclic butadiyne-linked porphyrin(2.1.2.1) oligomers are synthesized from 5,16-diethynylporphyrin(2.1.2.1) by Glaser–Hay coupling. Porphyrin(2.1.2.1) forms a bent structure which gives advantages for making cyclic structure without templating molecules. We isolated cyclic trimer and tetramer and characterized them by MALDI-TOF-MS and [Formula: see text]H NMR spectroscopy, theoretical calculations, UV-vis absorption and fluorescence spectra and cyclic voltammetry. The cyclic structure mainly affects the reduction potentials because of expansion of [Formula: see text]-conjugations through butadiyne-linkages to stabilize their LUMOs.

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

Influence of Si-Al-Ge-Sb Matricies on Tm3+ Excitation Levels

2008 ◽  
Vol 587-588 ◽  
pp. 293-297
Author(s):  
M. Pospíšilová ◽  
P. Adámek ◽  
P. Peterka ◽  
V. Kubeček ◽  
I. Kašík ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Fluorescence Spectra ◽  
Chemical Vapor ◽  
Oscillator Strengths ◽  
Absorption And Fluorescence Spectra ◽  
Measured Absorption ◽  
Optical Fiber Drawing ◽  
Solution Doping

Absorption and fluorescence spectra in the range from 350 to 1750 nm of several Tm3+- doped optical performs (rods) for optical fiber drawing were measured. Silica-based matrices of Al2O3-GeO2-P2O5-Sb2O3-SiO2 composition doped with several thousands ppm of Tm3+ were characterized. The preforms were fabricated by the Modified Chemical Vapor Deposition and by the solution doping methods. A new method, Genetic Algorithm SPEctra Decomposition was adopted for processing of the measured absorption spectra. This decomposition made it possible to calculate the oscillator strengths of Tm3+ absorption levels. Fluorescence bands of Tm3+ at 800 nm or 1640 nm were found in fluorescence spectra measured on the preform samples when excited at 1064 nm only.

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