scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

scholarly journals Azulenoisoindigo: A Building Block for π-Functional Materials with Reversible Redox Behavior and Proton Responsiveness

2021 ◽  
Author(s):  
Bin Hou ◽  
Jing Li ◽  
Xiaodi Yang ◽  
Jianwei Zhang ◽  
Hanshen Xin ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Functional Materials ◽  
Redox Behavior ◽  
Paramagnetic Resonance ◽  
Cation Radicals ◽  
H Nmr ◽  
Reversible Redox ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

<p>Azulene, one of representative nonbenzenoid aromatic hydrocarbons, exhibits unique molecular structure and distinctive physical and chemical properties. Herein, an azulene-based isoindigo analogue, azulenoisoindigo (<b>AzII</b>) is designed and synthesized, which has a twisted molecular backbone and R/S-isomers in single crystals. Interestingly, <b>AzII</b> shows the characteristics of both isoindigo and azulene, such as completely reversible redox behavior and reversible proton responsiveness. UV-vis-NIR, <sup>1</sup>H NMR and electron paramagnetic resonance (EPR) measurements were carried out to get insights into the possible mechanism of the proton-responsive property of <b>AzII</b>. The results demonstrated that only one azulenyl moiety of molecule of <b>AzII</b> was protonated and deprotonated, and the protonated <b>AzII</b> can be further oxidized to form azulenium cation radicals.</p>

scholarly journals Theoretical studies of the EPR parameters and local structure for the trigonal Yb3+ center in YAl3(BO3)4 crystal

2018 ◽  
Vol 65 (1) ◽  
pp. 1
Author(s):  
Hui-Ning Dong ◽  
Rong Zhang
Keyword(s):  
Chemical Properties ◽  
Defect Structures ◽  
Paramagnetic Resonance ◽  
Yttrium Aluminium ◽  
Epr Parameters ◽  
Structure Constants ◽  
Crystal Field Parameters ◽  
Physical And Chemical ◽  
Electron Paramagnetic ◽  
And Chemical Properties

Yttrium aluminium borate crystals have excellent physical and chemical properties. In this paper, the electron paramagnetic resonance (EPR) g factors g//, g^ of Yb3+ and hyperfine structure constants A//, A^ of 171Yb3+ and 173Yb3+ isotopes in YAl3(BO3)4 crystal are calculated from the perturbation formulas. The crystal field parameters are obtained from the superposition model and the crystal structure data. The EPR parameters for trigonal Yb3+ centers in YAl3(BO3)4 are reasonably explained by considering the defect structures of doped Yb3+ centers. In the calculation, we also find that Yb3+ ion does not exactly reside in Y3+ site, but suffers an angle distortion  Dq (≈ 3.98 Å) with C3 axis. The results are discussed.

Sila-Pharmaka, 9. Mitt. [1] Darstellung und Eigenschaften potentiell curarewirksamer Silicium-Verbindungen, I / Sila-Drugs, 9th Communication [1] Preparation and Properties of Silicon Compounds with Potential Curare-Like Activity, I

1978 ◽  
Vol 33 (4) ◽  
pp. 412-416 ◽  
Author(s):  
Reinhold Tacke ◽  
Roland Niedner
Keyword(s):  
Mass Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Organosilicon Compounds ◽  
Silicon Compounds ◽  
H Nmr ◽  
Toxicological Data ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

Abstract Organosilicon compounds 8, 9 and 10 with potential curare-like action and their precursors 5, 6 and 7 were synthesized for the first time. 5−10 were characterized by their physical and chemical properties, and their structures were confirmed by analyses, 1 H NMR and mass spectroscopy (only for 5−7). The pharmacological and toxicological data of 8, 9 and 10 are reported.

Synthese und Eigenschaften von Alkyloxi-und Aryloxi-substituierten Trithiadiborolanen / Synthesis and Properties of Alkoxi and Aryloxi Substituted Trithiadiborolanes

1981 ◽  
Vol 36 (11) ◽  
pp. 1444-1450 ◽  
Author(s):  
Max Schmidt ◽  
Erich Sametschek
Keyword(s):  
Thermal Stability ◽  
Nmr Spectra ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
H Nmr ◽  
New Compounds ◽  
Physical And Chemical ◽  
Thermal Stability Of ◽  
And Chemical Properties

Abstract The first examples of the hitherto unknown 1,2,4-Trithia-3,5-diborolanes with B-O-C-bonds have been synthesized and characterised. The diiodo substituted ring (2) reacts with 2,6-dimethylphenol, to form 3,5-bis-(2,6-dimethylphenyloxi)-1,2,4-trithia-3,5-di-borolane (3) and HI. 3,5-Diethoxi-1,2,4-trithia-3,5-diborolane, 5, and C2H5I are formed via the cleavage of diethylether by 2. From 2 and diisopropylether, the corresponding 3,5-diisopropyloxi-1,2,4-trithia-3,5-diborolane (6) is formed. The unsymmetrical ethers methyl-t-butylether and methylphenylether undergo reactions with 2 resulting in the formation of 3,5-dimethyloxi-1,2,4-trithia-3,5-diborolane (8) (besides t-C4H9I) and 3,5-diphenyloxi-1,2,4-trithia-3,5-diborolane (10) (besides CH3I). The thermal stability of the new compounds is increasing with increasing size of R in the -OR group and from aliphatic to aromatic R in this group. IR, Raman, 1H NMR and 11B NMR spectra of the compounds are reported as well as some physical and chemical properties.

scholarly journals Sila-Pharmaka, 14. Mitt. Darstellung und Eigenschaften sowie Kristall-und Molekülstruktur von Sila-Difenidol /Sila-Drugs, 14th Communication Preparation and Properties as well as Crystal and Molecular Structure of Sila-Difenidol

1979 ◽  
Vol 34 (9) ◽  
pp. 1279-1285 ◽  
Author(s):  
R. Tacke ◽  
M. Strecker ◽  
W. S. Sheldrick ◽  
E. Heeg ◽  
B. Berndt ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Mass Spectroscopy ◽  
Crystal And Molecular Structure ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
H Nmr ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Sila-difenidol (6b), a sila-analogue of the drug difenidol (6a), was synthesized according to Scheme 1. 6b and its new precursors 3 and 5 were characterized by their physical and chemical properties, and their structures confirmed by elementary analyses, 1H NMR and mass spectroscopy. 6 b crystallizes orthorhombic P212121 with a = 11.523(1), b = 14.366(4), c = 11.450(1) Å, Z = 4, Dber = 1.14 gcm-3. The structure was refined to R = 0.050 for 1897 reflexions. A strong nearly linear intramolecular O-H···N hydrogen bond of 2.685 Å is observed. The anticholinergic, histaminolytic and musculotropic spasmolytic activities of 6 a and 6 b are reported.

scholarly journals Encapsulation of Fatty Oils into Electrospun Nanofibers for Cosmetic Products with Antioxidant Activity

2019 ◽  
Vol 9 (15) ◽  
pp. 2955 ◽  
Author(s):  
Aleksandra Miletić ◽  
Branimir Pavlić ◽  
Ivan Ristić ◽  
Zoran Zeković ◽  
Branka Pilić
Keyword(s):  
Mechanical Properties ◽  
Antioxidant Activity ◽  
Chemical Properties ◽  
Electrospun Nanofibers ◽  
Functional Materials ◽  
Electrospinning Technique ◽  
Active Compounds ◽  
Good Material ◽  
Physical And Chemical ◽  
And Chemical Properties

Active compounds derived from pomegranate and sea-buckthorn were encapsulated into polylactide (PLA-based fibers) and poly(vinyl-pirrolidone) (PVP-based fibers) nanofibers using electrospinning technique. The focus was on the antioxidant activity of prepared nonwovens. Morphology, thermal, and mechanical properties were also examined. Due to the different physical and chemical properties of the basic polymers, the obtained results indicate that PLA-based fibers have better antioxidant activity than PVP-based ones. All prepared samples were formed from bead-less continuous fibers networks, but in the case of PLA-based samples some small irregularities in the structure occurred. Mechanical properties were improved with the addition of active compounds in most of the cases, while thermal properties were slightly affected. Preserved antioxidant activity of active compounds by encapsulation and good material properties significant for manipulation, make these functional materials promising candidates for application in cosmetics.

Technological Processes for Obtaining Monolithic Polydisperse Protein-Base Systems

2018 ◽  
Vol 284 ◽  
pp. 133-138 ◽  
Author(s):  
S.A. Parshina ◽  
A.Yu. Sokolov ◽  
E.O. Savchenko
Keyword(s):  
Food Processing ◽  
Sustainable Use ◽  
Chemical Properties ◽  
Functional Materials ◽  
Structure And Properties ◽  
Natural Polymers ◽  
Technological Processes ◽  
Raster Electron Microscopy ◽  
Physical And Chemical ◽  
And Chemical Properties

This research addresses the challenges of sustainable use of natural polymers, including in technical fields. One of the leading trends in science and industry headway today lies in designing advanced functional materials, e.g. for manufacturing medical items, technical devices, food-processing tools et al. For this purpose, universally applicable technological processes are being developed, including in biotechnology. One of the main goals of this research is to explore ways to consolidate living systems, by instilling in them desirable physical and chemical properties so as to diversify their applications, including in technical fields. Polymers structure and properties have been investigated via raster electron microscopy, spectral analysis, et al.

Nanoparticulate Functional Materials: Green Synthesis and Application for the Degradation of Phenolic Compounds

2012 ◽  
Vol 476-478 ◽  
pp. 1608-1611
Author(s):  
Feng Zhang
Keyword(s):  
Phenolic Compounds ◽  
Zinc Oxide Nanoparticles ◽  
Chemical Properties ◽  
Functional Materials ◽  
Oxide Nanoparticles ◽  
Physical And Chemical Properties ◽  
Nano Zno ◽  
Physical And Chemical ◽  
Zinc Acetate Precursor ◽  
And Chemical Properties

Zinc oxide nanoparticles was synthesized by microwave decomposition of zinc acetate precursor. Horseradish peroxidase (HRP) was immobilized on nano-ZnO. The catalytic activity, physical, and chemical properties of immobilized HRP as well as the interaction between HRP and nano-ZnO was studied. The Nano-ZnO immobilized HRP showed a better property in the thermostability, active pH stability. The Nano-ZnO is more effective than free HRP in the removal of many phenolic compounds. The results show that nano-ZnO is strong functional materials for envrionment protection.

Sila-Pharmaka, 16. Mitt. [1]. Sila-Analoga von Nifedipin-ähnlichen 4-Aryl-2.6-dimethyl-1.4-dihydropyridin-3.5-dicarbonsäure-dialkylestern, I. / Sila-Drugs, 16th Communication [1]. Sila-Analogues of Nifedipine-Like Dialkyl 4-Aryl-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylates, I.

1980 ◽  
Vol 35 (4) ◽  
pp. 494-501 ◽  
Author(s):  
R. Tacke ◽  
A. Bentlage ◽  
R. Towart ◽  
H. Meyer ◽  
F. Bossert ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
H Nmr ◽  
Physical And Chemical ◽  
Antihypertensive Properties ◽  
First Time ◽  
And Chemical Properties

The nifedipine-like 1,4-dihydropyridines 10a and 11a as well as their sila-analogues 10b, 10c, and 11b were synthesized for the first time. 10a, 10b, 10c, 11 a , 11b , and their precursors 8a, 8b, 9a, and 9b were characterized by their physical and chemical properties, and their structures confirmed by analyses, 1H NMR and mass spectroscopy. The antispasmodic, vasodilating, and antihypertensive properties of 10a, 10b, 10c, 11a, and 11b were compared.

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