Langmuir Films of Asphaltene Model Compounds and Their Fluorescent Properties

Langmuir ◽  
2008 ◽  
Vol 24 (16) ◽  
pp. 8742-8751 ◽  
Author(s):  
Erland L. Nordgård ◽  
Eva Landsem ◽  
Johan Sjöblom
Keyword(s):  
Langmuir Films ◽  
Fluorescent Properties ◽  
Model Compounds

Synthesis and fluorescent properties of model compounds for conjugated polymer containing maleimide units at the main chain

2011 ◽  
Vol 49 (16) ◽  
pp. 3550-3558 ◽  
Author(s):  
Kenjiro Onimura ◽  
Mieko Matsushima ◽  
Munetoshi Nakamura ◽  
Tatsuya Tominaga ◽  
Kazuhiro Yamabuki ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Main Chain ◽  
Fluorescent Properties ◽  
Model Compounds

scholarly journals Comparing C2=O and C2=S Barbiturates: Different Hydrogen-Bonding Patterns of Thiobarbiturates in Solution and the Solid State

2021 ◽  
Vol 22 (23) ◽  
pp. 12679
Author(s):  
Chenming Li ◽  
Philipp Hilgeroth ◽  
Nazmul Hasan ◽  
Dieter Ströhl ◽  
Jörg Kressler ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Association Constants ◽  
Langmuir Films ◽  
Brewster Angle Microscopy ◽  
Temperature Dependent ◽  
Model Compounds ◽  
Hydrophobic Polymer ◽  
Hydrogen Bonding Strength ◽  
Bonding Patterns

Carbonyl-centered hydrogen bonds with various strength and geometries are often exploited in materials to embed dynamic and adaptive properties, with the use of thiocarbonyl groups as hydrogen-bonding acceptors remaining only scarcely investigated. We herein report a comparative study of C2=O and C2=S barbiturates in view of their differing hydrogen bonds, using the 5,5-disubstituted barbiturate B and the thiobarbiturate TB as model compounds. Owing to the different hydrogen-bonding strength and geometries of C2=O vs. C2=S, we postulate the formation of different hydrogen-bonding patterns in C2=S in comparison to the C2=O in conventional barbiturates. To study differences in their association in solution, we conducted concentration- and temperature-dependent NMR experiments to compare their association constants, Gibbs free energy of association ∆Gassn., and the coalescence behavior of the N-H‧‧‧S=C bonded assemblies. In Langmuir films, the introduction of C2=S suppressed 2D crystallization when comparing B and TB using Brewster angle microscopy, also revealing a significant deviation in morphology. When embedded into a hydrophobic polymer such as polyisobutylene, a largely different rheological behavior was observed for the barbiturate-bearing PB compared to the thiobarbiturate-bearing PTB polymers, indicative of a stronger hydrogen bonding in the thioanalogue PTB. We therefore prove that H-bonds, when affixed to a polymer, here the thiobarbiturate moieties in PTB, can reinforce the nonpolar PIB matrix even better, thus indicating the formation of stronger H-bonds among the thiobarbiturates in polymers in contrast to the effects observed in solution.

Langmuir films of dichroic dyes with fluorescent properties

2003 ◽  
Vol 56 (3) ◽  
pp. 209-217 ◽  
Author(s):  
A Biadasz ◽  
R Hertmanowski ◽  
T Martyński ◽  
K Inglot ◽  
D Bauman
Keyword(s):  
Langmuir Films ◽  
Fluorescent Properties

Structure Revision of Protoaculeine B, a Posttranslationally Modified N-Terminal Residue in the Peptide Toxin Aculeine B

2020 ◽  
Author(s):  
Raku Irie ◽  
Kei Miyako ◽  
Satoko Matsunaga ◽  
Ryuichi Sakai ◽  
Masato Oikawa
Keyword(s):  
Mass Spectra ◽  
Chemical Reactivity ◽  
Model Compounds ◽  
Structural Revision ◽  
Structure Revision ◽  
Peptide Toxin ◽  
One Step ◽  
Marine Peptide ◽  
Synthetic Models ◽  
Long Chain

<div>Here, we newly propose the structure of protoaculeine B, an N-terminal moiety of the marine peptide toxin aculeine B, as possessing the cis-disubstituted tetrahydro-beta-carboline framework. We prepared two truncated model compounds that lack long-chain polyamine by one-step Pictet-Spengler reaction of tryptophan, and compared the NMR and mass spectra and chemical reactivity with those of natural protoaculeine B. The synthetic models reproduced the profiles of the natural product well, which was conclusive for the structural revision.</div>

MONOLAYERS LENGMYUR AZAKRAUN-ESSENTIAL DERIVATIVES OF CALIXES[4]ARENA

2018 ◽  
Vol 1 (11(56)) ◽  
pp. 62-64
Author(s):  
A.A. Muravev ◽  
E.A. Ivanova ◽  
A.T. Yakupov
Keyword(s):  
Aggregation Behavior ◽  
Langmuir Films ◽  
Azacrown Ether ◽  
Derivatives Of

In this work, aggregation behavior of azacrown-ether derivatives on a macrocyclic calix[4]arene scaffold within ultrathin Langmuir films on water subphase is considered.

OH- Removal and its Effect on the Fluorescent Properties of Er3+/Yb3+ Co-doped Barium Gallogermanate Glass

2009 ◽  
Vol 24 (2) ◽  
pp. 243-246 ◽  
Author(s):  
Xiao-Ping JIANG ◽  
Zhong-Min YANG ◽  
Zhou-Ming FENG
Keyword(s):  
Fluorescent Properties ◽  
Co Doped

Lignin to Value-Added Chemical Synthesis

2020 ◽  
Vol 16 ◽  
Author(s):  
Mahdieh Sharifi ◽  
Ramyakrishna Pothu ◽  
Rajender Boddula ◽  
Inamuddin
Keyword(s):  
Ionic Liquids ◽  
Lignocellulosic Biomass ◽  
Academic Research ◽  
Power Saving ◽  
Value Added ◽  
Glycerol Ether ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Biomass Activity ◽  
Lignin Model

Background: There is a developing demand for innovation in petroleum systems replacements. Towards this aim, lignocellulosic biomass suggested as a possible sustainable source for the manufacturing of fuels and produced chemicals. The aims of this paper are to investigate different kinds of β-O-4 lignin model compounds for the production of value-added chemicals in presence of ionic liquids. Especially, a cheap β-O-4 lignin model Guaiacol glycerol ether (GGE) (Guaifenesin) is introduced to produce valuable chemicals and novel products. Methods: Research related to chemical depolymerization of lignocellulosic biomass activity is reviewed, the notes from different methods such as thermal and microwave collected during at least 10 years. So, this collection provides a good source for academic research and it gives an efficient strategy for the manufacturing of novel value-added chemicals at an industrial scale. Results: This research presented that ionic liquid microwave-assisted is a power saving, cost efficient, fast reaction, and clean way with high selectively and purity for production of high value chemicals rather that conversional heating. Guaiacol and catechol are some of these valuable chemicals that is produced from β-O-4 lignin model compounds with high word demands that are capable to produce in industry scale. Conclusion: The β-O-4 lignin model compounds such as Guaiacol glycerol ether (GGE) (Guaifenesin) are good platform for developing food materials, perfumery, biorefinery, and pharmaceutical industry by ionic liquids-assisted lignin depolymerization method.

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