Schiff base fluorescent hydrogel containing acylhydrazone structure and pyridine ring with multifunction

2022 ◽  
Author(s):  
Jinde He ◽  
Ye Yuan ◽  
Liuyan Tang ◽  
Jinqing Qu
Keyword(s):  
Schiff Base ◽  
Pyridine Ring

scholarly journals Aqua{4,4′-dimethoxy-2,2′-[pyridine-2,3-diylbis(nitrilomethanylylidene)]diphenolato}copper(II)

2012 ◽  
Vol 68 (8) ◽  
pp. m1069-m1070 ◽  
Author(s):  
Fatiha Benghanem ◽  
Razika Benramdane ◽  
Sofiane Bouacida ◽  
Saida Keraghel ◽  
Ali Ourari
Keyword(s):  
Schiff Base ◽  
Pyridine Ring ◽  
Crystal Packing ◽  
Interplanar Distance ◽  
Mirror Plane ◽  
Stacking Interactions ◽  
Apical Position ◽  
Tetradentate Schiff Base ◽  
Hydrogen Bonding Interactions ◽  
Centroid Distance

Molecules of the title compound, [Cu(C21H17N3O4)(H2O)], lie across a crystallographic mirror plane. The CuIIatom is five-coordinated in a distorted square-pyramidal environment by two phenolate O atoms and two imine N atoms of the tetradentate Schiff base anion in the basal plane and one water molecule in the apical position. Because of symmetry, the pyridine N atom and the corresponding C atom at the 4-position of the pyridine ring are disordered. The crystal packing can be described as being composed of alternating layers stacked along [001]. Intramolecular C—H...N and intermolecular C—H...O and O—H...O hydrogen-bonding interactions, as well as C—H...π and π–π stacking interactions [shortest centroid–centroid distance = 3.799 (8) Å and interplanar distance = 3.469 (2) Å] are observed.

scholarly journals Crystal structure of di-μ-chlorido-bis(chlorido{N1-phenyl-N4-[(pyridin-2-yl-κN)methylidene]benzene-1,4-diamine-κN4}mercury(II))

2015 ◽  
Vol 71 (9) ◽  
pp. m175-m176 ◽  
Author(s):  
Md. Serajul Haque Faizi ◽  
Elena V. Prisyazhnaya
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Dihedral Angle ◽  
Phenyl Ring ◽  
Pyridine Ring ◽  
Title Complex ◽  
The Other ◽  
Inversion Symmetry ◽  
Central Ring ◽  
Cl Atoms

The whole molecule of the title complex, [Hg2Cl4(C18H15N3)2], is generated by inversion symmetry. It was synthesized from the pyridine-derived Schiff baseN-phenyl-N′-[(pyridin-2-yl)methylidene]benzene-1,4-diamine (PPMBD). The five-coordinated Hg2+ions have a distorted square-pyramidal environment defined by two N atoms,viz.the imine and the other pyridyl [Hg—N = 2.467 (6) and 2.310 (6) Å, respectively] belonging to the bidentate iminopyridine ligand, and three Cl atoms [Hg—Cl = 2.407 (2), 2.447 (2) and 3.031 (2) Å]. The longest Hg—Cl bond is bridging about the inversion centre. In the ligand, the central ring and pyridine ring are oriented at a dihedral angle of 8.1 (4)°, while the planes of the pyridine ring and the terminal phenyl ring are oriented at a dihedral angle of 53.8 (4)°. In the crystal, molecules are linked by N—H...Cl and C—H...Cl hydrogen bonds, forming sheets parallel to (001).

π–π Dimerization of a mono(pyridyl–imine) platinum(II) chelate

2012 ◽  
Vol 68 (7) ◽  
pp. m189-m193
Author(s):  
Rosanne C. Salmond ◽  
Orde Q. Munro
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Pyridine Ring ◽  
Chloride Ion ◽  
Complex Salt ◽  
Title Complex ◽  
Lateral Shift ◽  
Square Planar ◽  
Tridentate Schiff Base

The cation of the title complex salt, chlorido{2,2-dimethyl-N-[(E)-1-(pyridin-2-yl)ethylidene]propane-1,3-diamine}platinum(II) tetrafluoridoborate, [PtCl(C12H19N3)]BF4, exhibits a nominally square-planar PtIIion coordinated to a chloride ion [Pt—Cl = 2.3046 (9) Å] and three unique N-atom types,viz.pyridine, imine and amine, of the tridentate Schiff base ligand formed by the 1:1 condensation of 1-(pyridin-2-yl)ethanone and 2,2-dimethylpropane-1,3-diamine. The cations are π-stacked in inversion-related pairs (dimers), with a mean plane separation of 3.426 Å, an intradimer Pt...Pt separation of 5.0785 (6) Å and a lateral shift of 3.676 Å. The centroid (Cg) of the pyridine ring is positioned approximately over the PtIIion of the neighbouring cation (Pt...Cg= 3.503 Å).

scholarly journals Iodocyclisation of Electronically Resistant Alkynes: Synthesis of 2-Carboxy (and sulfoxy)-3-iodobenzo[b]thiophenes

2021 ◽  
Vol 74 (1) ◽  
pp. 65 ◽  
Author(s):  
Shuqi Chen ◽  
Bernard L. Flynn
Keyword(s):  
Schiff Base ◽  
Carboxy Group ◽  
Pyridine Ring ◽  
Radical Mechanism ◽  
Addition Reactions ◽  
Electrophilic Attack ◽  
Reaction Conditions ◽  
Highly Effective ◽  
Alkyne Coupling

The iodocyclisation of alkynes bearing tethered nucleophiles is a highly effective method for the construction and diversification of heterocycles. A key limitation to this methodology is the 5-endo-dig iodocyclisation of alkynes that have an unfavourable electronic bias for electrophilic cyclisation. These tend to direct electrophilic attack of the iodonium atom to the wrong carbon for cyclisation, thus favouring competing addition reactions. Using our previously determined reaction conditions for the 5-endo-dig iodocyclisations of electronically resistant alkynes, we have achieved efficient synthetic access to 2-carboxy (and sulfoxy)-3-iodobenzo[b]thiophenes. The corresponding benzo[b]furans and indoles were not accessible under these conditions. This difference may arise due to the availability of a radical mechanism in the case of iodobenzo[b]thiophenes. The 2-carboxy functionality of the iodocyclised products can be further employed in iterative alkyne-coupling iodocyclisation reactions, where the carboxy group or an imine (Schiff base) partakes in a second iodocyclisation to generate a lactone or pyridine ring.

Spin-crossover in an iron(iii) complex showing a broad thermal hysteresis

2021 ◽  
Author(s):  
Cyril Rajnák ◽  
Romana Mičová ◽  
Ján Moncoľ ◽  
Ľubor Dlháň ◽  
Christoph Krüger ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Mononuclear Complex ◽  
Hysteresis Width ◽  
Thermally Induced

A pentadentate Schiff-base ligand 3,5Cl-L2− and NCSe− form a iron(iii) mononuclear complex [Fe(3,5Cl-L)(NCSe)], which shows a thermally induced spin crossover with a broad hysteresis width of 24 K between 123 K (warming) and 99 K (cooling).

Polymer Anchored Copper (II) Complex Supported by -ONNO- Schiff Base: Efficient Catalysts for Oxidation of Phenol

2011 ◽  
Vol 3 (11) ◽  
pp. 44-48
Author(s):  
Alekha Kumar Sutar ◽  
◽  
Yasobanta Das ◽  
Prasanta Rath ◽  
Tungabidya Maharana
Keyword(s):  
Schiff Base ◽  
Polymer Anchored ◽  
Oxidation Of Phenol
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