scholarly journals Novel styryl and aza-styryl cyanine dyes: Synthesis and spectral sensitization evaluation

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Elemental Analysis ◽  
Phenyl Ring ◽  
Spectroscopic Data ◽  
Cyanine Dyes ◽  
Ring System ◽  
Ethanol Solution ◽  
Spectral Sensitization ◽  
Visible Absorption ◽  
Naphthyl Ring ◽  
Visible Spectra

Novel styryl cyanine dyes and aza-styryl cyanine dyes having the nucleus of furo[(3,2-d)pyrazole;(3',2'-d)oxazole] iodide salt were prepared. Spectral sensitization evaluation for all the synthesized styryl and aza-styryl cyanine dyes was carried out through investigating their electronic visible absorption spectra in 95% ethanol solution. The dyes were thought to be better spectral sensitizers when they absorb light at longer wavelength bands (bathochromic shifted and/or red shifted dyes). Consequently the spectral sensitization of the dyes decreased when they absorb light at shorter wavelength bands (hypsochromic shifted and/or blue shifted dyes). The results discussed in this study revealed that the spectral sensitization properties of the examined dyes is highly effected by the type of the X substituted in the phenyl ring system for the styryl cyanine dyes and by the type of the phenyl and/or the naphthyl ring system for the aza-styryl cyanine dyes. Structural confirmations were identified by elemental analysis, visible spectra, IR and 1H NMR spectroscopic data.

scholarly journals Novel styryl and aza-styryl cyanine dyes: Synthesis and spectral sensitization evaluation

2019 ◽  
Author(s):  
Chem Int ◽  
Hassan Abazied Shindy
Keyword(s):  
Elemental Analysis ◽  
Phenyl Ring ◽  
Spectroscopic Data ◽  
Cyanine Dyes ◽  
Ring System ◽  
Ethanol Solution ◽  
Spectral Sensitization ◽  
Visible Absorption ◽  
Naphthyl Ring ◽  
Visible Spectra

Novel styryl cyanine dyes and aza-styryl cyanine dyes having the nucleus of furo[(3,2-d)pyrazole;(3',2'-d)oxazole] iodide salt were prepared. Spectral sensitization evaluation for all the synthesized styryl and aza-styryl cyanine dyes was carried out through investigating their electronic visible absorption spectra in 95% ethanol solution. The dyes were thought to be better spectral sensitizers when they absorb light at longer wavelength bands (bathochromic shifted and/or red shifted dyes). Consequently the spectral sensitization of the dyes decreased when they absorb light at shorter wavelength bands (hypsochromic shifted and/or blue shifted dyes). The results discussed in this study revealed that the spectral sensitization properties of the examined dyes is highly effected by the type of the X substituted in the phenyl ring system for the styryl cyanine dyes and by the type of the phenyl and/or the naphthyl ring system for the aza-styryl cyanine dyes. Structural confirmations were identified by elemental analysis, visible spectra, IR and 1H NMR spectroscopic data.

Novel carbocyanine and bis-carbocyanine dyes: synthesis, visible spectra studies, solvatochromism and halochromism

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Spectral Data ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Ethanol Solution ◽  
Carbocyanine Dyes ◽  
Buffer Solutions ◽  
Ph Values ◽  
Universal Buffer ◽  
Visible Spectra

Novel carbocyanine dyes (trimethine cyanine dyes) and bis-carbocyanine dyes (bis-trimethine cyanine dyes) derived from the nucleus of benzo[2,3-b; 2',3'-b'] bis-furo[2,3-d]imidazoline-3,5,8,10-tetra one were synthesized. The electronic visible adsorption spectra of all the synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism and/or halochromism for some selected dyes were examined in pure solvents having different polarities (water, dimethylformamide, ethanol, chloroform, carbontetrachloride and dioxane) and/or in aqueous universal buffer solutions owing varied pH values (1.45, 2.03, 3.72, 5.09, 7.57, 8.91, 10.20 and 12.04 units), respectively. Structural confirmations were determined by elemental analysis, visible, mass, IR and 1H NMR spectral data.

Novel pyrazolo pyrazoly heterocyclic in the synthesis of positive solvatochromic cyanine dyes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Absorption Spectra ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Ethanol Solution ◽  
Visible Absorption ◽  
Nucleus Structure

Novel cyanine dyes monomethine, bismonomethine and trimethine cyanine dyes were synthesized from 5-hydroxy-2-(5-hydroxy-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-2-ium as a nucleus. Structure confirmed by elemental analysis, IR, 1H-NMR, mass and visible was determined. The electronic visible absorption spectra of all the newly synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism for the newly prepared cyanine dyes were performed in pure solvents having different polarities.

Synthesis, photosensitization and antimicrobial activity evaluation of some novel Merocyanine dyes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Aspergillus Flavus ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Fungal Strains ◽  
Activity Evaluation ◽  
Visible Spectra ◽  
Merocyanine Dyes

Novel acyclic and cyclic merocyanine dyes derived from the nucleu of furo [(3,2-d) pyrazole; ( d 2 , 3 )imidazole]were prepared. The electronic visible absorptionspectra of all the synthesized new cyanine dyes were examined in 95% ethanolsolution to evaluate their photosensitization properties. Antibacterial andantifungal activities for some selected dyes were tested against various bacterialand fungal strains (Escherichia coli, Staphylococcus aureus, Aspergillus flavus andCandida albicans) to evaluate their antimicrobial activity. Structural identificationwas carried out via elemental analysis, visible spectra, IR and 1H NMRspectroscopic data.

scholarly journals Microwave Induced Synthesis of Pyrazoline Compounds Containing Substituted Benzyloxy Phenyl Ring System

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Jyoti Prajapati ◽  
Mangalshree Dulawat ◽  
Prakash Prajapat ◽  
Renu Rathore ◽  
Shiv S. Dulawat
Keyword(s):  
Reaction Time ◽  
Green Chemistry ◽  
Microwave Irradiation ◽  
Spectral Data ◽  
Elemental Analysis ◽  
Phenyl Ring ◽  
Ring System ◽  
Short Reaction Time ◽  
Highly Efficient

<div><p><em>Green chemistry uses highly efficient and environmental benign synthetic procedures to synthesize various bioactive heterocyclic frameworks which are the useful synthons for the synthesis of medicines, plastics, petrochemicals, agrochemicals, cosmetics and many more hence the green chemistry is the need of the day. In this methodology pyrazolines have been synthesized under microwave irradiation<sup>1</sup> using ethanol /alumina. The structures of these compounds were established by elemental analysis and spectral data. The method has several advantages in comparison with conventional synthesis including clean reaction procedure, easy workup, and short reaction time giving excellent yields of product.</em></p></div>

scholarly journals Synthesis and Visible Spectral Behaviour of Some New Photosensitizers: Monomethine, Dimethine, Trimethine, Styryl and Mixed Cyanine Dyes

1999 ◽  
Vol 23 (12) ◽  
pp. 700-701
Author(s):  
Hassan A. Shindy
Keyword(s):  
Nmr Spectroscopy ◽  
Absorption Spectra ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Visible Absorption ◽  
H Nmr ◽  
Spectral Behaviour

The new photosensitizers, monomethine, dimethine, trimethine, styryl and mixed cyanine dyes incorporating pyrazolo/oxazole(thiazole) nuclei are prepared; the visible absorption spectra for all the synthesized cyanines were examined in 95% ethanol; structural confirmation is carried out by elemental analysis, IR and 1H NMR spectroscopy.

scholarly journals (1R,2R)-8-Bromo-1-[(E)-2-(4-bromophenyl)ethenyl]-2-nitro-1,2-dihydronaphtho[2,1-b]furan

IUCrData ◽  
2016 ◽  
Vol 1 (4) ◽  
Author(s):  
Xiaoqin Fang ◽  
Yifeng Wang
Keyword(s):  
Double Bond ◽  
Medicinal Plants ◽  
Phenyl Ring ◽  
Furan Ring ◽  
Ring System ◽  
Dihedral Angles ◽  
Active Components ◽  
Compound C ◽  
Naphthyl Ring ◽  
The Mean

The title compound,C20H13Br2NO3, contains the dihydrobenzofuran moiety, which is present in the physiologically active components of many medicinal plants. The naphthyl ring system is nearly perpendicular to the phenyl ring, while the mean plane of the double bond is almost coplanar with the phenyl ring [dihedral angles of 79.14 (3) and 13.56 (1)°, respectively]. The nitro group and bromobenzene alkenyl group aretransto one another on opposite sides of the furan ring. There are two stereogenic centres, and each has theRconfiguration. In the crystal, there are very weak intermolecular C—H...Br interactions.

scholarly journals Crystal structure of benzyl 2-naphthyl ether, a sensitiser for thermal paper

2019 ◽  
Vol 75 (2) ◽  
pp. 242-245
Author(s):  
Takuya Kikuchi ◽  
Saori Gontani ◽  
Kyohei Miyanaga ◽  
Takaaki Kurata ◽  
Yoshiki Akatani ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dihedral Angle ◽  
Title Compound ◽  
Phenyl Ring ◽  
Ring System ◽  
Π Interactions ◽  
Molecular Arrangement ◽  
Naphthyl Ring ◽  
Thermal Paper

The title compound [systematic name: 2-(benzyloxy)naphthalene], C17H14O, which is used as a sensitiser for thermal paper, has a twisted conformation with a dihedral angle of 48.71 (12)° between the phenyl ring and the naphthyl ring system. In the crystal, one molecule interacts with six neighbouring molecules via intermolecular C—H...π interactions to form a herringbone molecular arrangement.

scholarly journals Green Synthesis andIn VitroBiological Evaluation of Heteroaryl Chalcones and Pyrazolines of Medicinal Interest

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Vishal Banewar
Keyword(s):  
Green Synthesis ◽  
Elemental Analysis ◽  
Broad Spectrum ◽  
Spectroscopic Data ◽  
Heterocyclic Compounds ◽  
Biological Activities ◽  
Biological Evaluation ◽  
Active Compounds

Pyrazolines are well known and important nitrogen containing 5-membered heterocyclic compounds. In the present investigation, a series of various heteroaryl chalcones and pyrazolines were synthesized by condensing formylquinolines with diverse ketones. The newly synthesized 2-pyrazolines were characterized on the basis of elemental analysis and spectroscopic data. All of the newly synthesized target compounds were selected by the NCI forin vitrobiological evaluation. These active compounds exhibited broad spectrum of various biological activities. Most of the compounds showed potent activity.

scholarly journals Crystal structure ofN1-phenyl-N4-[(quinolin-2-yl)methylidene]benzene-1,4-diamine

2014 ◽  
Vol 70 (9) ◽  
pp. o905-o906 ◽  
Author(s):  
Md. Serajul Haque Faizi ◽  
Ashraf Mashrai ◽  
Saleem Garandal ◽  
M. Shahid
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Benzene Ring ◽  
Title Compound ◽  
Phenyl Ring ◽  
Bond Angle ◽  
Ring System ◽  
Dihedral Angles ◽  
Quinoline Ring ◽  
Compound C

In the title compound, C22H17N3, the dihedral angles between the central benzene ring and the terminal phenyl ring and quinoline ring system (r.m.s. deviation = 0.027 Å) are 44.72 (7) and 9.02 (4)°, respectively, and the bond-angle sum at the amine N atom is 359.9°. In the crystal, the N—H group is not involved in hydrogen bonding and the molecules are linked by weak C—H...π interactions, generating [010] chains.

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