scholarly journals Heterocyclic Schiff Bases of 3-Aminobenzanthrone and Their Reduced Analogues: Synthesis, Properties and Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2570
Author(s):  
Natalja Orlova ◽  
Irena Nikolajeva ◽  
Aleksandrs Pučkins ◽  
Sergey Belyakov ◽  
Elena Kirilova
Keyword(s):  
Condensation Reaction ◽  
Solvent Polarity ◽  
Aromatic Aldehydes ◽  
Crystal Structure Analysis ◽  
The Novel ◽  
X Ray ◽  
Synthesis Properties ◽  
Heterocyclic Schiff Bases ◽  
Stokes Shifts ◽  
Single Crystal Structure Analysis

New substituted azomethines of benzanthrone with heterocyclic substituents were synthesized by condensation reaction of 3-aminobenzo[de]anthracen-7-one with appropriate aromatic aldehydes. The resulting imines were reduced with sodium borohydride to the corresponding amines, the luminescence of which is more pronounced in comparison with the initial azomethines. The novel benzanthrone derivatives were characterized by NMR, IR, MS, UV/Vis, and fluorescence spectroscopy. The structure of three dyes was studied by the X-ray single crystal structure analysis. The solvent effect on photophysical behaviors of synthesized imines and amines was investigated. The obtained compounds absorb at 420–525 nm, have relatively large Stokes shifts (up to 150 nm in ethanol), and emit at 500–660 nm. The results testify that emission of the studied compounds is sensitive to the solvent polarity, exhibiting negative fluorosolvatochromism for the synthesized azomethines and positive fluorosolvatochromism for the obtained amines. The results obtained indicate that the synthesized compounds are promising as luminescent dyes.

scholarly journals Coordination chemistry and photoswitching of dinuclear macrocyclic cadmium-, nickel-, and zinc complexes containing azobenzene carboxylato co-ligands

2019 ◽  
Vol 15 ◽  
pp. 840-851
Author(s):  
Jennifer Klose ◽  
Tobias Severin ◽  
Peter Hahn ◽  
Alexander Jeremies ◽  
Jens Bergmann ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Crystal Structure Analysis ◽  
Mixed Ligand ◽  
Ionization Mass ◽  
Coupling Constant ◽  
Magnetic Exchange ◽  
X Ray ◽  
Magnetic Exchange Coupling ◽  
Ferromagnetic Exchange ◽  
Single Crystal Structure Analysis

The synthesis of mixed-ligand complexes of the type [M2L(μ-L')]+, where L represents a 24-membered macrocyclic hexaaza-dithiophenolate ligand, L' is an azobenzene carboxylate co-ligand, and M = Cd(II), Ni(II) or Zn(II), is reported. A series of new complexes were synthesized, namely [M2L(μ-L')]+ (L' = azo-H, M = Cd (1), Ni (2); L' = azo-OH, M = Zn (3), Ni (4); L' = azo-NMe2, M = Zn (5), Cd (6), Ni (7); L' = azo-CO2Me, M = Cd (8), Ni (9)), and characterized by elemental analysis, electrospray ionization mass spectrometry (ESIMS), IR, UV–vis and NMR spectroscopy (for diamagnetic Zn and Cd complexes) and X-ray single crystal structure analysis. The crystal structures of 3' and 5–8 display an isostructural series of compounds with bridging azobenzene carboxylates in the trans form. The paramagnetic Ni complexes 2, 4 and 7 reveal a weak ferromagnetic exchange interaction with magnetic exchange coupling constant values between 21 and 23 cm−1 (H = −2JS1S2). Irradiation of 1 with λ = 365 nm reveals a photoisomerization of the co-ligand from the trans to the cis form.

A fourfold interpenetrating diamond-like three-dimensional zinc(II) coordination polymer: synthesis, crystal structure and physical properties

2019 ◽  
Vol 75 (5) ◽  
pp. 504-507 ◽  
Author(s):  
Hui-Ru Chen
Keyword(s):  
Crystal Structure ◽  
Room Temperature ◽  
Three Dimensional ◽  
Fluorescence Emission ◽  
Crystal Structure Analysis ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Compounds ◽  
X Ray ◽  
Coordination Framework

Excellent fluorescence properties are exhibited by d 10 metal compounds. The novel three-dimensional ZnII coordination framework, poly[[{μ2-bis[4-(2-methyl-1H-imidazol-1-yl)phenyl] ether-κ2 N 3:N 3′}(μ2-furan-2,5-dicarboxylato-κ2 O 2:O 5)zinc(II)] 1.76-hydrate], {[Zn(C6H2O5)(C20H18N4O)]·1.76H2O} n , has been prepared and characterized using IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The crystal structure analysis revealed that the compound exhibits a novel fourfold interpenetrating diamond-like network. This polymer also displays a strong fluorescence emission in the solid state at room temperature.

Stereoselective Syntheses of Alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates in Solvent-Free Conditions, X-Ray Single Crystal Structure Analysis of Ethyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetate

2005 ◽  
Vol 60 (5) ◽  
pp. 569-571 ◽  
Author(s):  
Ali Ramazani ◽  
Ali Morsali ◽  
Bijan Ganjeie ◽  
Ali Reza Kazemizadeh ◽  
Ebrahim Ahmadi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Solvent Free ◽  
Single Crystal Structure ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Stereoselective Syntheses ◽  
Single Crystal Structure Analysis

Selenourea reacts with dialkyl acetylenedicarboxylates under solvent-free conditions to form 1:1 adducts, which undergo a cyclization reaction to produce alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates, in good yields. The stereochemistry of the ethyl Z-2-(2-amino-4-oxo-1,3- selenazol-5(4H)-ylidene)acetate was established by X-ray single crystal structure analysis. The reaction is completely stereoselective.

Effects of Acidity on Nitrogen-Heterocyclic Compounds with Rare Earth Coordination and the Structure of Protonated Phenanthroline

2011 ◽  
Vol 233-235 ◽  
pp. 2808-2811
Author(s):  
Huan Huan Li ◽  
Hai Bin Chu ◽  
Ying Nan Chen ◽  
Xiao Tao Fu ◽  
Hui Juan Sun ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heterocyclic Compounds ◽  
Crystal Structure Analysis ◽  
Rare Earth Ions ◽  
Molecular Formula ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Rare Earth Coordination ◽  
Single Crystal Structure Analysis

2,3-bis(2-pyridyl)-5,6-dihydropyrazine and a protonated phenanthroline (Phen) have been synthesized and the structure of protonated Phen is established by X-ray diffraction single crystal structure analysis. The coordination reactions of Phen, 2,2'- bipyridine and 2,3-bis(2-pyridyl)-5,6-dihydropyrazine with rare earth ions in low pH have been studied. The results show that 2,3-bis(2-pyridyl)-5,6-dihydropyrazine is hydrolyzed to be 2,2’-pyridil and protonated ethylenediamine. Meanwhile, Phen combines with proton, which results that nitrogen atoms can not coordinate with rare earth ions. The molecular formula of protonated Phen is C12H8N2HCl·H2O. It crystallizes in the triclinic space group P -1 (2), with a = 7.1212(14) Å, b = 7.2786(15) Å, c = 20.817(4) Å, α = 90.00º, β = 96.69(3) º, γ = 90.00 º, V = 1071.65(379) Å3, Z = 4.

X-ray and neutron diffraction investigation at 298 K of NH4I · NH3 and ND4I · ND3 containing the cation H3N – H … NH3+ and D3N – D … ND3+

1992 ◽  
Vol 200 (3-4) ◽  
Author(s):  
H. J. Berthold ◽  
E. Vonholdt ◽  
R. Wartchow ◽  
T. Vogt
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Single Crystal Structure ◽  
X Ray ◽  
Single Crystal Structure Analysis

AbstractNHA single crystal structure analysis of NThe deuterated compound NThe structures of the ordered low temperature phases will be reported separately.

X-Ray Crystal Structure Analysis of Deacetyldehydroeuphorianin: The Correct Structure of the Novel Pentacyclic Macrocyclic Diterpene, Euphorianin

1987 ◽  
Vol 42 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Joseph I. Okogun ◽  
Christopher O. Fakunle ◽  
Donald E. U. Ekong ◽  
Hans J. Lindner ◽  
Gerhard G. Habermehl
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
The Novel ◽  
X Ray ◽  
Correct Structure

Abstract The conversion of euphorianin to deacetyldehydroeuphorianin which was used in an X-ray crystal structure analysis is described. A new pentacyclic structure related to ingol tetraacetate is described for euphorianin.

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