Side Chain Influence on Main Chain Orientation of PPV-Type Oligomers

1999 ◽  
Vol 598 ◽  
Author(s):  
Ruth Müllner ◽  
Laurence Noirez ◽  
Egbert Zojer ◽  
Franz Stelzer ◽  
Günther Leising
Keyword(s):  
Magnetic Field ◽  
Neutron Diffraction ◽  
Main Chain ◽  
Side Chain ◽  
Phenylene Vinylene ◽  
Spectroscopic Methods ◽  
Polarized Optical Microscopy ◽  
Chain Orientation ◽  
H Nmr ◽  
Ft Ir

ABSTRACTOligo (p-phenylene vinylene)s OPV were synthesized having cyanobiphenyloxy-groups bonded to the vinylene double bonds via alkylene spacers. A Pd(0)-reaction was used to synthesize the oligomers starting with the dibromo-substituted benzene and the alkenyloxy-biphenyl-nitrile. The orientation of the mesogens by a magnetic field and their influence on the orientation of the main chain was investigated by means of neutron diffraction ND. Data on the photophysics of the oligomers were gained using several spectroscopic methods such as UV/VIS, polarized optical microscopy POM, SEC, 1H-NMR, FT-IR.

scholarly journals Synthesis and antioxidant properties of 2-(3-(hydroxyimino)methyl)-1H-indol-1-yl)acetamide derivatives

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Chandravadivelu Gopi ◽  
Magharla Dasaratha Dhanaraju
Keyword(s):  
Antioxidant Activity ◽  
Condensation Reaction ◽  
Antioxidant Properties ◽  
Side Chain ◽  
Antioxidant Power ◽  
H Nmr ◽  
Antioxidant Agents ◽  
Phenyl Rings ◽  
Ferric Reducing Antioxidant Power ◽  
Ft Ir

Abstract Background The main aim of this work was to synthesise a novel N-(substituted phenyl)-2-(3-(hydroxyimino) methyl)-1H-indol-1-yl) acetamide derivatives and evaluate their antioxidant activity. These compounds were prepared by a condensation reaction between 1H-indole carbaldehyde oxime and 2-chloro acetamide derivatives. The newly synthesised compound structures were characterised by FT-IR, 1H-NMR, mass spectroscopy and elemental analysis. Furthermore, the above-mentioned compounds were screened for antioxidant activity by using ferric reducing antioxidant power (FRAP) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) methods. Result The antioxidant activity result reveals that most of the compounds were exhibiting considerable activity in both methods and the values are very closer to the standards. Among the synthesised compounds, compound 3j, 3a and 3k were shown remarkable activity at low concentration. Conclusion Compounds 3j, 3a and 3k were shown highest activity among the prepared analogues due to the attachment of halogens connected at the appropriate place in the phenyl ring. Hence, these substituted phenyl rings considered as a perfect side chain for the indole nucleus for the development of the new antioxidant agents.

scholarly journals Synthesis of Fluorinated Amphiphilic Block Copolymers Based on PEGMA, HEMA, and MMA via ATRP and CuAAC Click Chemistry

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Fatime Eren Erol ◽  
Deniz Sinirlioglu ◽  
Sedat Cosgun ◽  
Ali Ekrem Muftuoglu
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Amphiphilic Block Copolymers ◽  
Random Copolymers ◽  
Side Chain ◽  
Dipolar Cycloaddition ◽  
Controlled Synthesis ◽  
H Nmr ◽  
Ft Ir ◽  
Click Coupling

Synthesis of fluorinated amphiphilic block copolymers via atom transfer radical polymerization (ATRP) and Cu(I) catalyzed Huisgen 1,3-dipolar cycloaddition (CuAAC) was demonstrated. First, a PEGMA and MMA based block copolymer carrying multiple side-chain acetylene moieties on the hydrophobic segment for postfunctionalization was carried out. This involves the synthesis of a series of P(HEMA-co-MMA) random copolymers to be employed as macroinitiators in the controlled synthesis of P(HEMA-co-MMA)-block-PPEGMA block copolymers by using ATRP, followed by a modification step on the hydroxyl side groups of HEMA via Steglich esterification to afford propargyl side-functional polymer, alkyne-P(HEMA-co-MMA)-block-PPEGMA. Finally, click coupling between side-chain acetylene functionalities and 2,3,4,5,6-pentafluorobenzyl azide yielded fluorinated amphiphilic block copolymers. The obtained polymers were structurally characterized by1H-NMR,19F-NMR, FT-IR, and GPC. Their thermal characterizations were performed using DSC and TGA.

Study on Synthesis and Characterization of Unsaturated Polyester by Enzyme-Catalyzed

2013 ◽  
Vol 575-576 ◽  
pp. 67-70
Author(s):  
Fen Juan Shao ◽  
Qun Yang ◽  
Lan Ying Li ◽  
Da Nian Lu
Keyword(s):  
High Temperature ◽  
Unsaturated Polyester ◽  
Soxhlet Extraction ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Cross Link ◽  
H Nmr ◽  
Ft Ir

Unsaturated polyester was prepared with adipic acid (AA), fumaric acid (FA), itaconic acid (IA) and 1, 6-hexanediol (HD) by enzyme-catalyzed polmerization. The insoluble gel fraction (Qs), as the cross-linking degree of cured unsaturated polyesters which could be self-cross-linked at high temperature through C=C in it, was got by Soxhlet Extraction. The properties were investigated by FT-IR, 1H NMR, DSC, XRD and so on. The results indicated that the C=C in unsaturated diacids reduced the acitvity of N435, which affected the polmerization. With the introduction of C=C of IA or FA, the Mn of polyester reduced. The C=C could self-cross-link under high temperature for lengthy time. The higher the temperature and the longer the time, the Qs increased. As the C=C of IA was in the side chain, it could move easily. Then Qs of poly (AA-co-IA-co-HD) was higher than ploy (AA-co-FA-co-HD). With the increased content of unsaturated diacid, Qs increased. And the biodegradation of cross-linked polyesters became worse.

Modification of styrene polymer by attaching suitable groups as side chain

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Mehrdad Mahkam ◽  
Bakhshali Massoumi ◽  
Hossien Mirfatahi
Keyword(s):  
Thermogravimetric Analysis ◽  
Cycloaddition Reaction ◽  
Side Chain ◽  
H Nmr ◽  
Azide Ion ◽  
Ft Ir ◽  
Commercial Polymers ◽  
Polymerization Method ◽  
Thermal Stability Of ◽  
Dimethyl Acetylene Dicarboxylate

AbstractChemical modification of inexpensive commercial polymers, such as styrene, is a safe methodology to obtain new copolymers. The 4-chloromethyl styrene (CMS) was copolymerized with styrene (in various mole ratios) by free radical polymerization method at 70 ºC using α,α-azobis(isobutyronitrile) (AIBN) as an initiator. The azide ion was covalently attached to the obtained copolymers with replacement of all the chlorine atoms in CMS units. The 1,3-dipolar click cycloaddition reaction between azido polymers and dimethyl acetylene dicarboxylate (DMAD) yielded polymers with 1,2,3-triazoles in side chain. The polymers, obtained in quantitative yields, were characterized by FT-IR and 1H NMR spectroscopy; thermogravimetric analysis (TGA) and GPC studies. The thermogravimetric analysis (TGA) indicated that the thermal stability of copolymers increases with incorporation of 1,2,3-triazole groups in side chains of copolymers.

Synthesis and Characterization of Polyesters Containing 5-Fluorouracil in the Main Chain

2012 ◽  
Vol 499 ◽  
pp. 99-103
Author(s):  
Jun Chang ◽  
Cheng Wu Li ◽  
Gang Li
Keyword(s):  
Main Chain ◽  
Slow Release ◽  
Uv Spectroscopy ◽  
Release Profile ◽  
Drug Release Profile ◽  
H Nmr ◽  
Ft Ir ◽  
Potential Antitumor

A series of polyesters containing 5-fluorouracil in the main chain were prepared by reacting potassium salt of 5-fluorouracil with different molecular weight ω-chloroalkyl chloroacetyl esters.The copolymers were characterized by FT-IR, 1H-NMR, VPO and UV spectroscopy. The drug release profile in vitro of the copolymers were studied, the results showed prodrug could slow release 5-FU or 5-FU units in different solution, they may be likely to become potential antitumor prodrug.

Preparation and Interaction of Modified PHS and CMC Liquid Composites

2014 ◽  
Vol 1035 ◽  
pp. 204-211 ◽  
Author(s):  
Xiao Ling Xu ◽  
Min Zhang ◽  
Ji Qing Song ◽  
Wen Qing He
Keyword(s):  
Molecular Dynamics ◽  
Polyethylene Glycol ◽  
Main Chain ◽  
Composite Films ◽  
Interfacial Interaction ◽  
Structure Characterization ◽  
Nmr Spectrum ◽  
H Nmr ◽  
Ft Ir

Novel liquid composites were successfully prepared by blending copolymer (PEG/PHS) and carboxymethyl cellulose (CMC) in this work. PEG/PHS was achieved by introducing polyethylene glycol (PEG) into the main chain of poly hexanediol succinic (PHS). The results showed that the structure characterization of PEG/PHS was displayed in 1H NMR spectrum. The interaction existed between PEG/PHS and CMC which was validated in FT-IR and SEM. This conjecture was simulated by molecular dynamics under the software YASARA. Because of the existence of interfacial interaction, composites films kept good thermal performance and the flexibility of composite films was greatly improved.

Synthesis, Characterization and Photophysicochemical Properties of Zinc(Ii) Phthalocyanine With New Benzenesulfonamide Derivative Substituents

2021 ◽  
Author(s):  
Gülen Atiye Öncül ◽  
Ömer Faruk Öztürk ◽  
Mehmet Pişkin
Keyword(s):  
Elemental Analysis ◽  
Mass Spectra ◽  
Spectroscopic Methods ◽  
H Nmr ◽  
Maldi Tof Mass Spectra ◽  
New Type ◽  
Ft Ir ◽  
Photochemical Properties ◽  
Photocatalytic Applications ◽  
C Nmr

Abstract Novel (E)-4-((5-bromo-2-hydroxy-3-methoxybenzylidene)amino)-N-(pyridin-2-yl)benzenesulfonamide 1, (E)-4-((5-bromo-2-(3,4-dicyanophenoxy)-3-methoxybenzylidene)amino)-N-(pyridin-2-yl)benzene sulfonamide 2 and 2(3),9(10),16(17),23(24)-tetra-[(E)-4-((5-bromo-3-methoxy-2-(λ1-oxidanyl)benzyl idene)amino)-N-(pyridine-2-yl)benzenesulfonamide]phthalocyaninato zinc(II) phthalocyanine 3 were synthesized. Their (1-3) structures were illuminated with spectroscopic methods such as FT-IR, 1H NMR,13C NMR, UV–vis, MALDI-TOF mass spectra and also elemental analysis. The spectroscopic, photophysical and photochemical properties of the zinc(II) phthalocyanine 3 were investigated in dimethyl sulfoxide and its effects on the above mentioned properties were reported as a result of containing new type benzenesulfonamide derivatives as substituents. In addition, its above-mentioned properties were reported by comparing different species with those of their substituted and/or unsubstituted counterparts. The zinc(II) phthalocyanine 3 has photosensitizing abilities suitable and sufficient especially for photocatalytic applications.

Synthesis and Characterization of Polyesteramides Containing 5-Fluorouracil in the Main Chain

2011 ◽  
Vol 284-286 ◽  
pp. 1728-1731
Author(s):  
Jun Chang ◽  
Cheng Wu Li ◽  
Gang Li
Keyword(s):  
Main Chain ◽  
Slow Release ◽  
Uv Spectroscopy ◽  
Release Profile ◽  
Drug Release Profile ◽  
H Nmr ◽  
Ft Ir ◽  
Potential Antitumor

A series of polyesteramide containing 5-fluorouracil in the main chain were prepared by reacting potassium salt of 5-fluorouracil with N-(2-chloroacetoxylalkyl)-chloroacetamide.The copolymers were characterized by FT-IR, 1H-NMR, VPO and UV spectroscopy. The drug release profile in vitro of the copolymers were studied, the results showed prodrug could slow release 5-FU or 5-FU units in different solution, they may be likely to become potential antitumor prodrug.

Thermal Properties of a Liquid-Crystalline Polyurethanes Containing Biphenyl Mesogen

2006 ◽  
Vol 321-323 ◽  
pp. 1385-1388
Author(s):  
Jong Baek Lee ◽  
Kwang Hyun Lee ◽  
Byung Chul Kang ◽  
Byung Won Kang ◽  
Sang Ll Lee ◽  
...  
Keyword(s):  
Nematic Phase ◽  
Liquid Crystalline ◽  
Main Chain ◽  
Spectroscopic Methods ◽  
Liquid Crystallinity ◽  
Cooling Stage ◽  
Temperature Ranges ◽  
New Type ◽  
Ft Ir ◽  
Tolylene Diisocyanate

A new type of thermotropic main-chain liquid crystalline polyurethanes containing biphenyl units was synthesized by polyaddition reaction of diisocyanates such as 2,6-tolylene diisocyanate, 2,5-tolylene diisocyanate, 2,4-tolylene diisocyanate, and 1,4-phenylene diisocyanate, with 4,4′-Bis(11-hydroxyundeyloxy)biphenyl (BP11). The structure of the monomer and the corresponding polymers were confirmed FT-IR and 1H NMR spectroscopic methods. BP11 exhibited a smectic type mesophase, however, nematic phase was found for all synthesized liquid crystalline polyurethanes except for 1,4-phenylene diisocyanate/BP11 based polyurethane. For example, polyurethane 2,5-TDI/BP11 exhibited monotropic liquid crystallinity in the temperature ranges from 173 to 156 °C on the cooling stage.

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