The Synthesis of Some New Mono and bis(Crown Ether)s and Their Sodium Complexes. Tautomerism in o‐Hydroxybenzo‐15‐crown‐5 Schiff Bases as Studied by UV‐VIS Spectrophotometry

2004 ◽  
Vol 34 (4) ◽  
pp. 713-732 ◽  
Author(s):  
Mustafa Hayvalı ◽  
Zeliha Hayvalı
Keyword(s):  
Crown Ether ◽  
Schiff Bases ◽  
Sodium Complexes

scholarly journals Crown Ether Schiff bases and their Complexes: Recent Advances (A Review )

2018 ◽  
Vol 34 (4) ◽  
pp. 1701-1718 ◽  
Author(s):  
KHALID MAHER ◽  
SHIREEN MOHAMMED
Keyword(s):  
Crown Ether ◽  
Schiff Bases ◽  
Review Paper ◽  
Literature Survey ◽  
Present Review ◽  
Chelating Activity ◽  
Recent Advances

In latterly years, an interest in the synthesis of crown ether Schiff bases and their Complexes has been increased, due to the significance and broadly the uses of these compounds in various fields. In the present review paper outline extensive recent advances literature survey on the crown ether including azomethine gathering and their complexes with the tough and easy granter atoms, has been reconsidered. Assertiveness has been done on element complexation with crown ether holding Schiff bases to enable the researchers to procure valuable information of the chelating activity of crown ether containing azomethine gathering and their enforcement.

An Embodiment on Metal-Complexation of Crown Ether Schiff Bases

2008 ◽  
Vol 28 (2) ◽  
pp. 89-159 ◽  
Author(s):  
Shobhana K. Menon, ◽  
Vrajesh B. Parikh,
Keyword(s):  
Crown Ether ◽  
Schiff Bases ◽  
Metal Complexation

ChemInform Abstract: SELECTIVITY IN THE N- AND/OR C-ALKYLATION OF SCHIFF BASES CATALYZED BY CROWN ETHER

1981 ◽  
Vol 12 (30) ◽  
Author(s):  
S. AKABORI ◽  
M. OHTOMI ◽  
K. SHIMADA ◽  
A. TAKEMURA
Keyword(s):  
Crown Ether ◽  
Schiff Bases

ChemInform Abstract: Metal Complexation of Crown Ether Schiff Bases

ChemInform ◽  
2009 ◽  
Vol 40 (42) ◽  
Author(s):  
Shobhana K. Menon ◽  
Vrajesh B. Parikh
Keyword(s):  
Crown Ether ◽  
Schiff Bases ◽  
Metal Complexation

Synthesis, Complex Formation and Spectral Investigation of New Tritopic Bis(Crown Ether) Compounds Containing Recognition Sites for Sodium and Nickel Guest Cations*

2000 ◽  
Vol 55 (10) ◽  
pp. 975-981 ◽  
Author(s):  
Zeliha Hayvali ◽  
Necla Gündüz ◽  
Zeynel Kilic ◽  
Edwin Weber
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Complex Formation ◽  
Crown Ether ◽  
Nickel Complexes ◽  
Spectral Investigation ◽  
Polar Solvents ◽  
Recognition Sites ◽  
Sodium Complexes ◽  
Basic Solutions

AbstractNew bis(crown ether) ligands (1 - 3) of Schiff base type containing recognition sites for sodium and nickel guest cations have been synthesized by the condensation of two equivalents of 4′-formyl-5′-hydroxy(benzo-15-crown-5)with 1,5-diamino-3-azapentane, 1,8-diamino-3,6- diazaoctane or 1,8-diamino-3,6-dioxaoctane. Homonuclear ditopic crystalline 2:1 (Na+:ligand) complexes (1a - 3a) of the ligands with NaClO4 have been prepared. Heteronuclear tritopic crystalline 2:1:1 (Na⊕ : Ni2⊕ : ligand) complexes (2b and 3b) have also been synthesized from the reactions of the ditopic complexes (2a and 3a) with Ni(CH3COO)2 · 6H2O. The UV-VIS spectra of 1 - 3, their sodium complexes 1a - 3a and sodium-nickel complexes 2b and 3b have been recorded in polar and non-polar solvents as well as in acidic and basic media. In polar solvents and basic solutions, tautomeric equilibria (phenol-imine and keto-amine forms, O-H···N⇌O···H-N ) are present, depending on the hydrogen bonding. The results indicate that the concentrations of the keto forms of the compounds generally increase as the polarity of the solvent increases

scholarly journals Binuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes with Schiff-bases derived from crown ether platforms: Rare examples of ether oxygen atoms bridging metal centers

Polyhedron ◽  
2010 ◽  
Vol 29 (11) ◽  
pp. 2269-2277 ◽  
Author(s):  
Lea Vaiana ◽  
Marta Mato-Iglesias ◽  
David Esteban-Gómez ◽  
Carlos Platas-Iglesias ◽  
Andrés de Blas ◽  
...  
Keyword(s):  
Crown Ether ◽  
Schiff Bases ◽  
Metal Centers ◽  
Ether Oxygen ◽  
Oxygen Atoms
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