scholarly journals Synthesis, Characterization, Thermochromism, and Photochromism of Aromatic Aldehyde Hydrazone Derivatives

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
ShaoPing Zhu ◽  
Yuan Chen ◽  
Jun Sun ◽  
YuTing Yang ◽  
ChuanJun Yue
Keyword(s):  
Uv Light ◽  
Time Variable ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Thermochromic Properties ◽  
Temperature Variable ◽  
Uv Visible ◽  
The Relationship ◽  
C Nmr ◽  
Visible Spectrometry

The Schiff bases N-(5-phenylthiazole-2-yl)-2-hydroxylnaphthaldehydehydrazone (1), N-(4′-chloro-5-phenylthiazole-2-yl)-2-hydroxylnaphthaldehydehydrazone (2), and N-(4′-nitro-5-phenylthiazole-2-yl)-2-hydroxylnaphthaldehydehydrazone (3) were synthesized. These compounds were characterized by using IR,1H NMR,13C NMR, and MS. The photochromism of the compounds was investigated by IR and UV-visible spectrometry which is time variable under irradiation of 254 nm UV light. The thermochromism of the compounds was studied using temperature-variable IR, UV-visible spectrometry, TG, and differential scanning calorimetry (DSC). The results suggested that compound2showed thermochromism properties and compounds2and3displayed photochromism properties. The relationship between the substituents species and photochromic or thermochromic properties of these compounds was revealed as well.

Cationic copolymerization of 1,3-pentadiene with α-pinene

2014 ◽  
Vol 34 (7) ◽  
pp. 583-589 ◽  
Author(s):  
Ai-Yuan Li ◽  
Xiang-Dong Sun ◽  
Hui-Bo Zhang ◽  
Yong-Chun Zhang ◽  
Bin Wang ◽  
...  
Keyword(s):  
Average Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Polymerization Temperature ◽  
Scanning Calorimetry ◽  
Gardner Color ◽  
H Nmr ◽  
Cationic Copolymerization ◽  
Ft Ir ◽  
Better Than ◽  
C Nmr

Abstract The cationic copolymerization of 1,3-pentadiene (PD) with α-pinene (AP) initiated by aluminum trichloride (AlCl3) was carried out in N-pentane solvent. The effects of the polymerization temperature and the comonomer composition on the yield of the copolymer, softening point, Gardner color scale and number-average molecular weight (Mn) are discussed. The performance of the copolymer was better than that of AP homopolymer (PAP) and PD homopolymer (PPD). The structure of the copolymer was characterized by Fourier transform infrared spectroscopy (FT-IR), 1H-nuclear magnetic resonance (1H-NMR), 13C-NMR, differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). In addition, the reactivity ratios for AP (M1) and PD (M2) determined by the Kelen-Tudos method from low-conversion data are r1=0.58 and r2=5.92, respectively.

Synthesis of Newer Mercury(II) Complexes of Meso-Tetraaryl-21,23-Dithiaporphyrins

2020 ◽  
Vol 12 (3) ◽  
pp. 416-421
Author(s):  
Soumee Bhattacharya ◽  
Uma Narang ◽  
Kumar Karitkey Yadav ◽  
Anshu Dandia ◽  
Shive M. S. Chauhan
Keyword(s):  
Fluorescence Spectra ◽  
Mercuric Acetate ◽  
H Nmr ◽  
Sensing Applications ◽  
Mercury Complex ◽  
Mercury Complexes ◽  
Visible Spectra ◽  
Uv Visible ◽  
Chloroform Methanol ◽  
C Nmr

Due to the larger size of hetero atom and poor binding with metals, N2X2 type of core modified porphyrins show lesser tendency to form metal complexes. Mercury(II) complexes of symmetrical and unsymmetrical meso-tetraaryl-21,23-dithiaporphyrins are synthesized and characterized by the reaction of corresponding meso-tetraaryl-21,23-dithiaporphyrins with mercuric acetate in chloroform/methanol. These mercury complexes are well characterized by their UV-Visible spectra, fluorescence spectra, 1H NMR, 13C NMR and elemental analysis. Soret bands of mercury complex of unsymmetrical 5,20-bis-(4′-methoxyphenyl)-10,15-bisphenyl-21,23-dithiaporphyrin appeared at 442 nm and 462 nm whereas Q band appeared at 516 nm, 560 nm, 620 nm and 714 nm. Appearance of four Q bands is characteristic for this mercury complex of N2X2 type of core modified porphyrins. Mercury complex of unsymmetrical 5,20-bis-(4′-methoxyphenyl)-10,15-bisphenyl-21,23dithiaporphyrin is an excellent fluorescent molecule and showed fluorescence spectrum at 722 nm. These core modified porphyrin complexes provides a good coordination examples of mercury complexes of 21,23-dithiaporphyrins that can be used in sensing applications.

scholarly journals Antimicrobial Applications of Transition Metal Complexes of Benzothiazole Based Terpolymer: Synthesis, Characterization, and Effect on Bacterial and Fungal Strains

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Mohamed A. Riswan Ahamed ◽  
Raja S. Azarudeen ◽  
N. Mujafar Kani
Keyword(s):  
Metal Complexes ◽  
Elemental Analysis ◽  
Biological Activities ◽  
Gel Permeation Chromatography ◽  
Spectral Studies ◽  
X Ray Diffraction ◽  
Spectral Techniques ◽  
H Nmr ◽  
Uv Visible ◽  
C Nmr

Terpolymer of 2-amino-6-nitro-benzothiazole-ethylenediamine-formaldehyde (BEF) has been synthesized and characterized by elemental analysis and various spectral techniques like FTIR, UV-Visible, and1H and13C-NMR. The terpolymer metal complexes were prepared with Cu2+, Ni2+, and Zn2+metal ions using BEF terpolymer as a ligand. The complexes have been characterized by elemental analysis and IR, UV-Visible, ESR,1H-NMR, and13C-NMR spectral studies. Gel permeation chromatography was used to determine the molecular weight of the ligand. The surface features and crystalline behavior of the ligand and its complexes were analyzed by scanning electron microscope and X-ray diffraction methods. Thermogravimetric analysis was used to analyze the thermal stability of the ligand and its metal complexes. Kinetic parameters such as activation energy(Ea)and order of reaction (n) and thermodynamic parameters, namely,ΔS,ΔF,S*, andZ, were calculated using Freeman-Carroll (FC), Sharp-Wentworth (SW), and Phadnis-Deshpande (PD) methods. Thermal degradation model of the terpolymer and its metal complexes was also proposed using PD method. Biological activities of the ligand and its complexes were tested againstShigella sonnei,Escherichia coli,Klebsiellaspecies,Staphylococcus aureus,Bacillus subtilis, andSalmonella typhimuriumbacteria andAspergillus flavus,Aspergillus niger,Penicilliumspecies,Candida albicans,Cryptococcus neoformans,Mucor speciesfungi.

Liquid crystalline hyperbranched polyesters with phosphorus functional groups

2020 ◽  
pp. 095400832096053
Author(s):  
Diana Serbezeanu ◽  
Ana-Maria Macsim ◽  
Ionela-Daniela Carja ◽  
Corneliu Hamciuc ◽  
Marius Pislaru ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Initial Decomposition Temperature ◽  
Molar Ratios ◽  
H Nmr ◽  
Hyperbranched Polyesters ◽  
Hyperbranched Poly ◽  
C Nmr

Liquid crystalline hyperbranched poly(aryl ester)s (A2B3) were prepared by polycondensation reaction of 2-(6-oxido-6H-dibenz<c,e><1,2>oxaphosphorin-6-yl)1,4-naphthalene diol with 1,3,5-benzenetricarbonyl trichloride, taken in two different molar ratios. The chemical structure of the newly synthesized hyperbranched polymers was confirmed by FTIR, 1H NMR, 13C NMR spectroscopy. The polymers exhibited high thermal stability with initial decomposition temperature above 410–435°C and char yield at 700°C higher than 40%. Combined differential scanning calorimetry, polarized optical microscopy and wide-angle X-ray diffraction measurements were carried out to closely examine their thermal behavior and phase transitions.

scholarly journals Resveratrol Functionalized Carboxymethyl-β-Cyclodextrin: Synthesis, Characterization, and Photostability

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Jin Gui Cheng ◽  
Bing Ren Tian ◽  
Qing Huang ◽  
Hu Rong Ge ◽  
Zhi Zhong Wang
Keyword(s):  
Absorption Spectrum ◽  
Inclusion Complex ◽  
Uv Light ◽  
Ultraviolet Absorption ◽  
Total Loss ◽  
Light Irradiation ◽  
Ultraviolet Absorption Spectrum ◽  
H Nmr ◽  
Uv Light Irradiation ◽  
C Nmr

The resveratrol functionalized carboxymethyl-β-cyclodextrin conjugate was synthesized by two simple steps. The conjugate was successfully demonstrated by 1H NMR, 13C NMR, UV, and FTIR. The photostability of the conjugate was studied by ultraviolet absorption spectrum. After 360 min of UV light irradiation, the conjugate showed a total loss in absorbance of only 12.54%, while the resveratrol and its CM-β-CD inclusion complex showed a total loss in absorbance of 32.15% and 24.05%, respectively. The results indicate that the conjugate was more stable than resveratrol and its CM-β-CD inclusion complex.

Mercury(I) chemistry. Part II. Reactions of the mercurous ion with some ligands having the heavier Group VA or VIA elements as donor atoms

1976 ◽  
Vol 54 (1) ◽  
pp. 177-187 ◽  
Author(s):  
Philip A. W. Dean ◽  
David G. Ibbott
Keyword(s):  
Sulfur Dioxide ◽  
Nmr Spectra ◽  
Large Magnitude ◽  
Liquid Sulfur ◽  
H Nmr ◽  
Phosphine Complexes ◽  
Back Bonding ◽  
The Relationship ◽  
Mercurous Ion ◽  
C Nmr

The reactions of Hg2(AsF6)2 with P(CF3)3, PF3, PCl3, P(CF3)Ph2, PClPh2, PPh3, P(OMe)3, AsPh3, SbPh3, SPPh3, SP(p-C6H4F)3, and SePPh3 in liquid sulfur dioxide have been studied. The last five ligands form insoluble 1:1 complexes, Hg2(AsF6)2•L, if L:Hg22+ ≤ 1, but disproportionation of the mercurous ion occurs if L:Hg22+ > 1; the 1:1 mercurous complexes have been characterized by analysis and vibrational spectroscopy. There is no evidence for complexation of P(CF3)3. PPh3 and P(OMe)3 cause disproportionation of the mercurous ion under all conditions; Hg(PPh3)22+ and Hg(P(OMe)3)22+ have been characterized by 13C and 1H nmr respectively. When P(CF3)Ph2:Hg22+ ≤ 1 soluble Hg2(P(CF3)Ph2)2+ is formed; the 19F and 13C nmr spectra of this complex are reported, as are those of Hg(P(CF3)Ph2)22+. In the system PF3–Hg2(AsF6)2–SO2 no disproportionation occurs; 19F nmr provides evidence that Hg2PF32+ and, probably, Hg2(PF3)22+ are formed. 1J(P–F) in mercurous and silver(I) complexes of PF3 is of unusually large magnitude. The 13C nmr spectra of Hg(PPh3)22+, Hg2(P(CF3)PPh2)2+, and Hg(P(CF3)Ph2)22+, are consistent with the occurrence of little metal-to-phosphorus back-bonding in these phosphine complexes. The relationship between the net electron donating ability of a phosphine and the nature of its interaction with the mercurous ion is discussed.

On Ruhemann's Purple

1980 ◽  
Vol 58 (3) ◽  
pp. 201-205 ◽  
Author(s):  
Donald C. Wigfield ◽  
Gerald W. Buchanan ◽  
Stephen M. Croteau
Keyword(s):  
Spectral Data ◽  
Nmr Spectrum ◽  
H Nmr ◽  
Uv Visible ◽  
Ruhemann’S Purple ◽  
C Nmr

The 1H nmr spectrum previously reported for Ruhemann's Purple is shown to be inconsistent with the accepted structure of this material. The discrepancy with the reported 1H nmr spectrum is shown to be due to the presence of a major impurity, identified as hydrindantin. Spectra (1H nmr, 3C nmr, ir, uv–visible) of Ruhemann's Purple, its protonated analogue DYDA, and other ninhydrin relatives are reported, and structural conclusions are based on these spectral data.

scholarly journals Green anionic polymerization of vinyl acetate using Maghnite-Na+ (Algerian MMT): synthesis characterization and reactional mechanism

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Badia Imene Cherifi ◽  
Mohammed Belbachir ◽  
Abdelkader Rahmouni
Keyword(s):  
Vinyl Acetate ◽  
Polymerization Reaction ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Simple Filtration ◽  
Renewable Material ◽  
Ft Ir ◽  
C Nmr

AbstractIn this work, the green polymerization of vinyl acetate is carried out by a new method which consists in the use of clay called Maghnite-Na+ as an ecological catalyst, non-toxic, inexpensive and recyclable by simple filtration. X-ray diffraction (XRD) showed that Maghnite-Na+ is successfully obtained after cationic treatment (sodium) on raw Maghnite. It is an effective alternative to replace toxic catalysts such as benzoyl peroxide (BPO) and Azobisisobutyronitrile (AIBN) which are mostly used during the synthesis of polyvinyl acetate (PVAc) making the polymerization reaction less problematic for the environment. The synthesis reaction is less energetic by the use of recycled polyurethane as container for the reaction mixture and which is considered as a renewable material and a good thermal insulator which maintains the temperature at 0 °C for 6 h. The reaction in bulk is also preferred to avoid the use of a solvent and therefore to stay in the context of green chemistry. In these conditions, the structure of obtained polymer is established by Nuclear Magnetic Resonance Spectroscopy 1H NMR and 13C NMR. Infrared spectroscopy (FT-IR) is also used to confirm the structure of PVAc. Thermogravimetric analysis (TGA) showed that it is thermally stable and it starts to degrade from 330 °C while Differential Scanning calorimetry (DSC) shows that this polymer has a glass transition temperature (Tg  = 50 °C). The composition in PVAc/Maghnite-Na+ (7 wt% of catalyst) is the most tensile resistant with a force of 182 N and a maximum stress of 73.16 MPa, the most flexible (E  = 955 MPa) and the most ductile (εr  = 768%).

scholarly journals Synthesis and structure/properties characterizations of four polyurethane model hard segments

2018 ◽  
Vol 5 (7) ◽  
pp. 180536 ◽  
Author(s):  
Lei Jiang ◽  
Zhiyong Ren ◽  
Wei Zhao ◽  
Wentao Liu ◽  
Hao Liu ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Hard Segment ◽  
Spectral Characteristics ◽  
Hexamethylene Diisocyanate ◽  
H Nmr ◽  
Starting Point ◽  
Hard Segments ◽  
The Relationship ◽  
C Nmr ◽  
Structure Properties

Four model polyurethane (PU) hard segments were synthesized by reaction of butanol with four typical diisocyanates. The four diisocyanates were aromatic 4,4′-diphenylmethane diisocyanate (4,4′-MDI) and MDI-50 (50% mixture of 2,4′-MDI and 4,4′-MDI), cycloaliphatic 4,4′-dicyclohexylmethane diisocyanate (HMDI) and linear aliphatic 1,6-hexamethylene diisocyanate (HDI). FTIR, 1 H NMR, 13 C NMR, MS, X-ray and DSC methods were employed to determine their structures and to analyse their crystallization behaviours and hydrogen bonding interactions. Each of the four PU compounds prepared in the present work displays unique spectral characteristics. The FTIR bands and NMR resonance peaks assigned in the four samples thus provide a reliable database and starting point for investigating the relationship between hard segment structure and the crystallization and hydrogen bonding behaviour in more complex-segmented PU compositions.

Silicon alkyne hybrid polymers containing Si–H and Si–CH3

2017 ◽  
Vol 30 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Shuaishuai Liu ◽  
Quan Zhou ◽  
Zhengqiang Peng ◽  
Ning Song ◽  
Lizhong Ni
Keyword(s):  
Oxidative Stability ◽  
Oxidation Resistance ◽  
Gel Permeation Chromatography ◽  
High Heat ◽  
Structure Design ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Thermal And Oxidative Stability ◽  
Gel Permeation ◽  
C Nmr

A silicon-containing polymer (HMSA), synthesized with n-BuLi, trichloroethylene, dichloromethylsilane, and dimethyldichlorosilane, with three different proportions of Si–H, and its influence on thermal oxidation have been studied. The structures of HMSA were characterized by Fourier transform infrared spectra, 1H-Nuclear Magnetic Resonance (H-NMR), 13C-NMR, 29Si-NMR, and gel permeation chromatography. Thermal and oxidative stabilities were studied by differential scanning calorimetry and thermogravimetric analysis, and the cross-linking reaction mechanisms of the HMSA were discussed. All the polymers exhibited excellent thermal and oxidation resistance; particularly, HMSA-1 showed high heat-resistant and thermo-oxidative stability; the temperatures of 5% weight loss ( Td5) were 636.3 and 645.5°C, and the residues at 1000°C were 87.07 and 86.23% in nitrogen and air, respectively. This system had excellent thermal and oxidative stability, and through the structure design, control of heat oxidation resistance was realized.

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