Synthesis and Characterization of New Polyaryleneethynylenes based on 3-Hexyl Multisubstituted Oligothiophene Blocks

1999 ◽  
Vol 598 ◽  
Author(s):  
Silvia Destri ◽  
William Porzio ◽  
Irina A. Khotina ◽  
Chiara Botta ◽  
Roberto Consonni
Keyword(s):  
Quantum Yield ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Large Molecules ◽  
Photoluminescence Quantum Yield ◽  
Nmr Characterization

ABSTRACTA series of new regioregular polyaryleneethynylene obtained by condensation of 3-hexyl multisubstituted oligothiophene derivatives with benzene and anthracene compounds were prepared. A complete NMR characterization of the starting monomers and model compounds lead to a deep investigation of the corresponding macromolecules. Both small and large molecules were optically characterized, the former, particularly when containing anthracene, moieties display noticeable photoluminescence quantum yield. In the polymers the photoluminescence quantum yield is lower than that of the starting molecules when anthracene is present, while the polymers containing benzene are more luminescent.

scholarly journals Synthesis and characterization of CdSxSe1−xalloy quantum dots with composition-dependent band gaps and paramagnetic properties

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 30002-30011 ◽  
Author(s):  
Yueh-Chi Chung ◽  
Chien-Hsin Yang ◽  
Hao-Wen Zheng ◽  
Ping-Szu Tsai ◽  
Tzong-Liu Wang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Fluorescence Intensity ◽  
Band Gaps ◽  
Synthesis And Characterization ◽  
Paramagnetic Properties

Both the fluorescence intensity and quantum yield of all the nanocrystals are much enhanced after the CdSxSe1−xQD cores are coated with a ZnS shell.

Synthesis and characterization of polymer supported vitamin B12 model compounds

2000 ◽  
Vol 49 (11) ◽  
pp. 1338-1342 ◽  
Author(s):  
S Sailaja Devi ◽  
M Radhakrishna Reddy ◽  
P Sambasiva Reddy ◽  
K Hussain Reddy ◽  
K Mohana Raju
Keyword(s):  
Vitamin B12 ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Polymer Supported

scholarly journals 3D0900 Synthesis and characterization of the chromophore model compounds of Photoactive Yellow Protein

2002 ◽  
Vol 42 (supplement2) ◽  
pp. S152
Author(s):  
H. Yamamoto ◽  
T. Sumi ◽  
N. Hamada ◽  
F. Tokunaga ◽  
T. Okamura ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Photoactive Yellow Protein ◽  
Model Compounds

Macrotorials: synthesis and characterization of model compounds related to PTH (1–34)

2006 ◽  
pp. 472-474
Author(s):  
A. F. Spatola ◽  
W. Ma ◽  
A. Harvey ◽  
S. Chandrasekhar ◽  
J. A. Dodge
Keyword(s):  
Synthesis And Characterization ◽  
Model Compounds

scholarly journals Boron difluoride formazanate copolymers with 9,9-di-n-hexylfluorene prepared by copper-catalyzed alkyne–azide cycloaddition chemistry

2016 ◽  
Vol 7 (21) ◽  
pp. 3589-3598 ◽  
Author(s):  
Stephanie M. Barbon ◽  
Joe B. Gilroy
Keyword(s):  
Light Harvesting ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Related Model ◽  
Boron Difluoride

The synthesis and characterization of copolymers with promising light-harvesting properties and closely related model compounds based on boron difluoride formazanate and 9,9-di-n-hexylfluorene units are described.

New Poly(4-Dichloro)Maleimides: III. Synthesis and Characterization of Poly[Ether-Ester-Azomethine-(4-Chloro) Maleimides] and Poly(Azomethin Ester-Aspartimides)

2001 ◽  
Vol 13 (4) ◽  
pp. 269-280 ◽  
Author(s):  
C Gaina ◽  
V Gaina ◽  
M Sava
Keyword(s):  
Weight Loss ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Elemental Analyses ◽  
Ether Ester

New poly[(N-ester-azo)-3-ether-4-chloro)maleimides] and poly(azomethin-ester-aspartimides) were synthesized by the reaction of N-[4-(formylphenoxy carboxylphenyl)]-3-(4-formylphenoxy)-4-chloromaleimide (3 a) or N-[4-formylphenoxycarbonylphenyl)maleimide (3 b) with various diamines. IR and elemental analyses confirmed the structures of the resulting polymers. A series of model compounds were synthesized to facilitate confirmation of the polymer structures. The polymers possess inherent viscosities in the range 0.17–0.42 dl g−1, solubility in aprotic dipolar solvents and 5% weight loss at temperatures above 300 °C.

Synthesis and characterization of several series of 4-acyl-1-[2-aryl-1-diazenyl]piperazines

2014 ◽  
Vol 92 (9) ◽  
pp. 838-848 ◽  
Author(s):  
Vanessa Renee Little ◽  
Keith Vaughan
Keyword(s):  
High Resolution ◽  
Ir Spectroscopy ◽  
Chemical Shifts ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Primary Aromatic Amine ◽  
Piperazine Ring ◽  
H Nmr ◽  
C Nmr

Five series of a novel class of 4-acyl-1-[2-aryl-1-diazenyl]piperazines have been synthesized and characterized: the 4-acetyl-1-[2-aryl-1-diazenyl]piperazines [series 1]; the 4-cyclohexylcarbonyl-1-[2-aryl-1-diazenyl]piperazines [series 2]; the 4-benzoyl-1-[2-aryl-1-diazenyl]piperazines [series 3]; the benzyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates [series 4]; and the t-butyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates [series 5]. The compounds were synthesized by diazotization of a primary aromatic amine and subsequent coupling to an appropriate secondary amine: 1-acetylpiperazine [series 1]; 1-(cyclohexylcarbonyl)-piperaizine [series 2]; 1-benzoylpiperazine [series 3]; benzyl 1-piperazinecarboxylate [series 4]; and t-butyl piperazine-1-carboxylate (1-BOC-piperazine) [series 5]. The compounds of series 1–5 were characterized by 1H NMR, 13C NMR, high-resolution MS and IR spectroscopy. The model compounds 1,4-di[2-aryl-1-diazenyl]piperazines, and ethyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates were used to facilitate the assignment of the chemical shifts specific to the piperazine ring carbons. HSQC spectra of select compounds established the correlation between proton and carbon resonance signals.

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