Cross-linked poly (4-vinylpyridine) supported azide ion as a versatile and recyclable polymeric reagent for synthesis of 1-substituted-1H-1,2,3,4-tetrazoles

2013 ◽  
Vol 11 (1) ◽  
pp. 91-99 ◽  
Author(s):  
Mohammad Ali Karimi Zarchi ◽  
Fatemeh Nazem
Keyword(s):  
Polymeric Reagent ◽  
Azide Ion

Remarkable kinetic stability of α-thiocarbamoyl substituted 4-methoxybenzylcations

1998 ◽  
Vol 76 (12) ◽  
pp. 1910-1915 ◽  
Author(s):  
Robert A McClelland ◽  
Victoria E Licence ◽  
John P Richard ◽  
Kathleen B Williams ◽  
Shrong-Shi Lin
Keyword(s):  
Key Words ◽  
Strong Interaction ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Visible Absorption ◽  
Methyl Group ◽  
Thioamide Group ◽  
Azide Ion ◽  
Uv Visible ◽  
Leaving Groups

4-Methoxybenzyl cations bearing α-(N,N-dimethylcarbamoyl) and α-(N,N-dimethylthiocarbamoyl) substituents have been generated photochemically upon irradiation of precursors with pentafluorobenzoate or 4-methoxybenzoate leaving groups. The ions have been observed with flash photolysis in 40:60 acetonitrile:water and in 50:50 methanol:water, and rate constants were measured for their decay in solvent alone and for their capture by azide ion. The cations so studied and their lifetimes in 40% acetonitrile are 6, ArC+H-CONMe2, 0.6 μs; 2, ArC+H-CSNMe2, 7 ms; and 4, ArC+(CH3)-CSMe2, 6 ms, where Ar = 4-MeOC6H4. The cation 4 reacts with solvent by elimination of a proton from the α-methyl group, and the rate constant for solvent addition must be less than 1 s-1. The CSNMe2 substituted cations are 105-107-fold longer lived than analogs where the thioamide group has been replaced with an α-methyl. The UV-visible absorption spectra of these two cations also show significant differences from those of typical 4-methoxybenzyl cations. Thus, both the lifetimes and spectra point to a strong interaction of the benzylic centre with the thioamide group. Key words: flash photolysis, thiocarbamoyl stabilized carbocation, photosolvolysis.

Interaction of Azide Ion with Hemin and CytochromecImmobilized on Au and Ag Nanoparticles

Langmuir ◽  
2005 ◽  
Vol 21 (25) ◽  
pp. 11896-11902 ◽  
Author(s):  
Renjis T. Tom ◽  
T. Pradeep
Keyword(s):  
Ag Nanoparticles ◽  
Azide Ion

Intermediates in the oxidation of azide ion in acidic solutions

1986 ◽  
Vol 90 (6) ◽  
pp. 1198-1203 ◽  
Author(s):  
Zeev B. Alfassi ◽  
W. A. Pruetz ◽  
Robert H. Schuler
Keyword(s):  
Acidic Solutions ◽  
Azide Ion

Electronic Spectra of the Azide Ion, Hydrazoic Acid, and Azido Molecules

1970 ◽  
Vol 52 (3) ◽  
pp. 1332-1340 ◽  
Author(s):  
J. R. McDonald ◽  
J. W. Rabalais ◽  
S. P. McGlynn
Keyword(s):  
Electronic Spectra ◽  
Hydrazoic Acid ◽  
Azide Ion

Etude théorique de la structure et de la réactivité de l'anion du pentazole

1983 ◽  
Vol 61 (7) ◽  
pp. 1435-1439 ◽  
Author(s):  
Minh-Tho Nguyen ◽  
Michel Sana ◽  
Georges Leroy ◽  
Jose Elguero
Keyword(s):  
Molecular Nitrogen ◽  
Activation Energies ◽  
Basis Set ◽  
Etude Théorique ◽  
Mo Calculations ◽  
Étude Théorique ◽  
Azide Ion ◽  
Synthetic Target ◽  
Stable Structures

"Abinitio" LCAO-SCF-MO calculations using the 4-31G basis set were carried out in order to study the supersystem [Formula: see text]. The three possible stable structures (azide ion + molecular nitrogen, pentazene ion, and pentazole ion) and their reactions paths were calculated. The pentazole anion is less stable than the reagents [Formula: see text], but much more stable than the pentazene anion; it could constitute a reasonable synthetic target. The activation energies of the different paths were compared with those of the neutral supersystem N5H.

scholarly journals Syntheses, Structures, Magnetic Properties and Antibacterial Activities of Two Copper(II) Azido Complexes with Varied Nuclearities Containing Symmetrical 1,3-Diammine as Chelator

2021 ◽  
Vol 33 (2) ◽  
pp. 359-366
Author(s):  
Habibar Chowdhury ◽  
Chandan Adhikary
Keyword(s):  
Hydrogen Bonds ◽  
Variable Temperature ◽  
Antibacterial Activities ◽  
Metal Centers ◽  
X Ray ◽  
Pyramidal Geometry ◽  
Azide Ion ◽  
3D Network ◽  
Square Pyramidal Geometry ◽  
Dinuclear Structure

Two copper(II) azido complexes of the types mononuclear [Cu(TMEDA)2(N3)2] (1) and dinuclear [Cu(TMEDA)(μ1,1-N3)(N3)]2 (2) [TMEDA = trimethylenediamine; N3 – = azide ion] have been synthesized and characterized. X-ray structural analysis revealed that each copper(II) center in complex 1 adopts a distorted octahedron geometry with a CuN6 chromophore ligated through four N atoms of two different symmetrical TMEDA ligands as bidentate chelator and two N atoms of two terminal azides. In complex 2, each copper(II) center adopts a distorted square pyramidal geometry with a CuN5 chromophore ligated through two N atoms of TMEDA as bidentate chelator and two N atoms of two different azides as μ1,1-N3 bridging mode and one N atom of terminal azide ion. The two copper centers are connected through double μ1,1-N3 bridges affording a dinuclear structure with Cu···Cu separation 3.327(2) Å. In crystalline state, mononuclear units in complex 1 are associated through intermolecular N-H···N and C-H···N hydrogen bonds to form a 2D sheet structure viewed along crystallographic b-axis, whereas dinuclear entities in complex 2 are propagated through intermolecular N-H···N and C-H···N hydrogen bonds to form a 3D network structure viewed along crystallographic a-axis. The Variable-temperature magnetic susceptibility measurement evidenced a dominant antiferromagnetic interaction between the metal centers through μ1,1-azide bridges in complex 2 with J = − 0.40 cm-1. The antibacterial activities of the complexes have also been studied.

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