scholarly journals Polysiloxanes Grafted with Mono(alkenyl)Silsesquioxanes—Particular Concept for Their Connection

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4784
Author(s):  
Katarzyna Mituła ◽  
Julia Duszczak ◽  
Monika Rzonsowska ◽  
Patrycja Żak ◽  
Beata Dudziec
Keyword(s):  
Chain Length ◽  
Hybrid Materials ◽  
Spectroscopic Methods ◽  
Synthetic Route ◽  
Hydrosilylation Reaction ◽  
Alkenyl Chain ◽  
Ft Ir ◽  
High Yields ◽  
New Compounds

Herein, a facile and efficient synthetic route to unique hybrid materials containing polysiloxanes and mono(alkyl)silsesquioxanes as their pendant modifiers (T8@PS) was demonstrated. The idea of this work was to apply the hydrosilylation reaction as a tool for the efficient and selective attachment of mono(alkenyl)substituted silsesquioxanes (differing in the alkenyl chain length, from -vinyl to -dec-9-enyl and types of inert groups iBu, Ph at the inorganic core) onto two polysiloxanes containing various amount of Si-H units. The synthetic protocol, determined and confirmed by FT-IR in situ and NMR analyses, was optimized to ensure complete Si-H consumption along with the avoidance of side-products. A series of 20 new compounds with high yields and complete β-addition selectivity was obtained and characterized by spectroscopic methods.

Synthesis, characterization and electrochemical properties of isoflavone substituted zinc(II), cobalt(II), and metal-free phthalocyanines

2019 ◽  
Vol 23 (07n08) ◽  
pp. 856-869 ◽  
Author(s):  
Efe B. Orman ◽  
Ahmet Arıbal ◽  
Ali R. Özkaya ◽  
Mustafa Bulut ◽  
Ümit Salan
Keyword(s):  
Tetrabutylammonium Perchlorate ◽  
Metal Free ◽  
Ft Ir ◽  
Electron Transfer Properties ◽  
New Compounds ◽  
Transfer Properties ◽  
Obvious Feature ◽  
Tof Ms ◽  
C Nmr

In this study, novel tetrasubstituted metallo- and metal-free phthalocyanines containing 7-hydroxy-4′-methoxyisoflavonoxy moieties at peripheral and non-peripheral positions have been prepared by cyclotetramerization of corresponding phthalonitriles. The most obvious feature of these quaternized complexes is their extensive solubility and non-aggregated species (especially non-peripherally substituted) in organic solvents such as chloroform, tetrahydrofuran, dimethylformamide and dimethylsulfoxide, which makes them candidates for use in many applications in different fields. The new compounds have been characterized by elemental analysis, FT-IR, UV-vis, 1H and [Formula: see text]C NMR and MS (Maldi-TOF MS). Voltammetric and in situ spectroelectrochemical measurements have been performed with the aim of characterizing the electron transfer properties of the compounds on Pt in dimethylsulfoxide/tetrabutylammonium perchlorate, compared to those of previously reported corresponding compounds with tetra 6-hydroxyflavonoxy substituents. The effect of aggregation on the redox character of these complexes was also discussed.

scholarly journals An Eco-Friendly Technique: Solvent-Free Microwave Synthesis and Docking Studies of Some New Pyridine Nucleosides and Their Pharmacological Significance

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1969 ◽  
Author(s):  
Majed Alrobaian ◽  
Sana Al Azwari ◽  
Amany Belal ◽  
Hany A. Eldeab
Keyword(s):  
Research Work ◽  
2D Nmr ◽  
Docking Studies ◽  
Microwave Assisted Synthesis ◽  
Bacterial Strains ◽  
Chemical Structures ◽  
Pharmacological Significance ◽  
Ft Ir ◽  
High Yields ◽  
New Compounds

Two series of novel 5-arylazo-3-cyano-2-(2″,3″,4″,6″-tetra-O-acetyl-β-d-galacto pyranosyloxy) pyridines and 3-cyano-2-(2″,3″,4″,6″-tetra-O-acetyl-β-d-galactopyranosyloxy) pyridines were synthesized in high yields utilizing a microwave-assisted synthesis tool guided by the principles of green chemistry. The chemical structures of the new substances were confirmed on the basis of their elemental analysis and spectroscopic data (FT-IR, 1D, 2D-NMR). Activity against different bacterial strains was studied. The anticancer potential of the new compounds is also discussed. Molecular docking was used as a tool in this research work to get better insight into the possible interactions, affinities, and expected modes of binding of the most promising derivatives of the potential chemotherapeutic target (DHFR).

scholarly journals Bio-inspired synthesis of palladium nanoparticles fabricated magnetic Fe3O4 nanocomposite over Fritillaria imperialis flower extract as an efficient recyclable catalyst for the reduction of nitroarenes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hojat Veisi ◽  
Bikash Karmakar ◽  
Taiebeh Tamoradi ◽  
Reza Tayebee ◽  
Sami Sajjadifar ◽  
...  
Keyword(s):  
Central Idea ◽  
Environmental Friendliness ◽  
Mild Conditions ◽  
Flower Extract ◽  
Catalytic Potential ◽  
Ligand Free ◽  
Ft Ir ◽  
High Yields ◽  
Magnetic Fe3o4

AbstractThis current research is based on a bio-inspired procedure for the synthesis of biomolecule functionalized hybrid magnetic nanocomposite with the Fe3O4 NPs at core and Pd NPs at outer shell. The central idea was the initial modification of magnetic NP by the phytochemicals from Fritillaria imperialis flower extract, which was further exploited in the green reduction of Pd2+ ions into Pd NPs, in situ. The flower extract also acted as a capping agent for the obtained Pd/Fe3O4 composite without the need of additional toxic reagents. The as-synthesized Fe3O4@Fritillaria/Pd nanocomposite was methodically characterized over different physicochemical measures like FT-IR, ICP-AES, FESEM, EDX, TEM, XPS and VSM analysis. Thereafter, its catalytic potential was evaluated in the reduction of various nitrobenzenes to arylamines applying hydrazine hydrate as reductant in ethanol/water (1:2) medium under mild conditions. Furthermore, the nanocatalyst was retrieved using a bar magnet and recycled several times without considerable leaching or loss of activity. This green, bio-inspired ligand-free protocol has remarkable advantages like environmental friendliness, high yields, easy workup and reusability of the catalyst.

4-Carboxymethyl-8-methyl-7-oxycoumarin substituted zinc, cobalt and indium phthalocyanines: electrochemical and photochemical properties

2013 ◽  
Vol 17 (10) ◽  
pp. 1046-1054 ◽  
Author(s):  
Ali Emre Çalık ◽  
Baybars Köksoy ◽  
Efe Baturhan Orman ◽  
Mahmut Durmuş ◽  
Ali Rıza Özkaya ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Elemental Analysis ◽  
Metal Salts ◽  
The Novel ◽  
Maldi Tof ◽  
Ft Ir ◽  
Photochemical Properties ◽  
New Compounds

In this study, the novel tetra-substituted Zn ( II )(3), Co ( II )(4) and In ( III )acetate (5) phthalocyanines were synthesized by cyclotetramerization reactions of 7-(2,3-dicyanophenoxy)-8-methylcoumarin-4-acetic acid (2) with corresponding metal salts. All the new compounds have been characterized by MALDI-TOF mass, FT-IR and UV-vis spectra, and elemental analysis as well. The electrochemical, in situ spectroelectrochemical and photochemical properties of tetra-substituted Zn ( II ), Co ( II ) and In ( III )acetate phthalocyanines were also investigated.

Synthesis, characterization and electrochemical properties of novel pyridine phthalocyanine derivatives

2018 ◽  
Vol 22 (01n03) ◽  
pp. 243-249 ◽  
Author(s):  
Büşra Mızrak ◽  
Efe Baturhan Orman ◽  
Şaziye Abdurrahmanoğlu ◽  
Ali Rıza Özkaya
Keyword(s):  
The Novel ◽  
Tetrabutylammonium Perchlorate ◽  
Metal Free ◽  
H Nmr ◽  
Vis Spectroscopy ◽  
Peripheral Position ◽  
Sandwich Type ◽  
Ft Ir ◽  
New Compounds

In this study, the novel Zn(II), metal-free and sandwich-type Lu(Pc)2 phthalocyanines containing tetra pyridine substituted at peripheral position were synthesized. All the new compounds have been characterized by FT-IR and UV-vis spectroscopy, [Formula: see text]H-NMR, MALDI-MS and elemental analysis. The electrochemical and spectroelectrochemical properties of all novel metallo- and metal free phthalocyanine compounds were also investigated by voltammetric and in situ spectroelectrochemical measurements on Pt in dimethylsulfoxide/tetrabutylammonium perchlorate.

scholarly journals Synthesis and Characterization of New Polyimide Contain Heterocyclic

2013 ◽  
Vol 10 (4) ◽  
pp. 1203-1210
Author(s):  
Baghdad Science Journal
Keyword(s):  
Nucleophilic Substitution ◽  
Hydrazine Hydrate ◽  
Carbon Disulfide ◽  
13C Nmr ◽  
Acid Hydrazide ◽  
Synthesis And Characterization ◽  
Spectroscopic Methods ◽  
Synthetic Route ◽  
Ft Ir

Novel heterocyclic polyimide 5(a,b) have been synthesized based on polyacrylic backbone. The synthetic route start with nucleophilic substitution of 2-amino, or 4-amino, pyridine 1(a,b) to the polyacryloyl chloride afforded poly substituted amide 2(a,b). Another nucleophilic substitution were carried with adipoyl chloride to form polyimide chloride 3(a,b). Treatment of 3(a,b) with hydrazine hydrate afforded acid hydrazide polyimide 4(a,b), which upon cyclocondensation with carbon disulfide gave the target heterocyclic polyimide. The synthesized compounds were identified by spectroscopic methods: FT-IR, 1H-NMR and 13C-NMR.

FT-IR microspectroscopic analysis of diseased white matter brain tissues

1995 ◽  
Vol 53 ◽  
pp. 968-969
Author(s):  
Steven M. Le Vine ◽  
David L. Wetzel
Keyword(s):  
White Matter ◽  
Gray Matter ◽  
Twitcher Mouse ◽  
Grid Pattern ◽  
Marked Contrast ◽  
Spatially Resolved ◽  
Ft Ir ◽  
Ir Microspectroscopy ◽  
Chemical Evidence

In situ FT-IR microspectroscopy has allowed spatially resolved interrogation of different parts of brain tissue. In previous work the spectrrscopic features of normal barin tissue were characterized. The white matter, gray matter and basal ganglia were mapped from appropriate peak area measurements from spectra obtained in a grid pattern. Bands prevalent in white matter were mostly associated with the lipid. These included 2927 and 1469 cm-1 due to CH2 as well as carbonyl at 1740 cm-1. Also 1235 and 1085 cm-1 due to phospholipid and galactocerebroside, respectively (Figs 1and2). Localized chemical changes in the white matter as a result of white matter diseases have been studied. This involved the documentation of localized chemical evidence of demyelination in shiverer mice in which the spectra of white matter lacked the marked contrast between it and gray matter exhibited in the white matter of normal mice (Fig. 3).The twitcher mouse, a model of Krabbe’s desease, was also studied. The purpose in this case was to look for a localized build-up of psychosine in the white matter caused by deficiencies in the enzyme responsible for its breakdown under normal conditions.

Unexpected Keto-enol Tautomerism in the Cyclopyridinophane Class Direct and indirect proofs

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Paul Ionut Dron ◽  
Neculai Doru Miron ◽  
Gheorghe Surpateanu
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Stable Conformer ◽  
Ph Measurements ◽  
Theoretical Methods ◽  
Nmr Data ◽  
Tautomeric Forms ◽  
New Compounds

The paper presents the synthesis of cyclo (bis-paraquat p-phenylene p-phenylene-carbonyl) tetrakis (hexafluorophosphate), named �CETOBOX�, and the closely related structural determinations. This compound exists in three tautomeric forms. These forms were evidentiated by NMR-data (1H-NMR, TOCSY, COSY, NOESY), UV-Vis spectra coupled with pH measurements and by synthesis. As the �CETOBOX� gives �in situ� only the corresponding monoylide, the synthesis of a new fluorescent indolizine cyclophane has been performed by a 3+2 cycloaddition. All structures of the new compounds presented herein have been established by NMR spectroscopy. Also, theoretical methods (MM3, AM1, AM1-COSMO and B88LYPDFT) have been used to determine the most stable conformer structures.

scholarly journals Microwave-Assisted Synthesis, Characterization, Antimicrobial and Antioxidant Activity of Some New Isatin Derivatives

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
G. Kiran ◽  
T. Maneshwar ◽  
Y. Rajeshwar ◽  
M. Sarangapani
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Radical Scavenging ◽  
Microwave Assisted Synthesis ◽  
Stable Free Radical ◽  
Ft Ir ◽  
Antimicrobial And Antioxidant Activity ◽  
New Compounds ◽  
Isatin Derivatives

A series of β-Isatin aldehyde-N,N′-thiocarbohydrazone derivatives were synthesized and assayed for theirin vitroantimicrobial and antioxidant activity. The new compounds were characterized based on spectral (FT-IR, NMR, MS) analyses. All the test compounds possessed a broad spectrum of activity having MIC values rangeing from 12.5 to 400 μg/ml against the tested microorganisms. Among the compounds3e,3jand3nshow highest significant antimicrobial activity. The free radical scavenging effects of the test compounds against stable free radical DPPH (α,α-diphenyl-β-picryl hydrazyl) and H2O2were measured spectrophotometrically. Compounds3j,3n,3l, and3e, respectively, had the most effective antioxidant activity against DPPH and H2O2scavenging activity.

scholarly journals Hybrid material by anchoring a ruthenium(ii) imine complex to SiO2: preparation, characterization and DFT studies

RSC Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 6221-6233
Author(s):  
G. Eliad Benitez-Medina ◽  
Raúl Flores ◽  
Luis Vargas ◽  
Fernando Cuenú ◽  
Pankaj Sharma ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Dft Studies ◽  
Ft Ir ◽  
Silica Hybrid

Ruthenium–silica hybrid materials were synthesized. The process was tracked by FT-IR, DRS-UV-Vis, DFT and deconvolution analyses, finding experimental–theoretical correlation.

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