Copper(II)-promoted solvolyses of nickel(II) complexes. III. Tetradentate Schiff base ligands containing various diamine segments

1973 ◽  
Vol 26 (7) ◽  
pp. 1475 ◽  
Author(s):  
WW Fee ◽  
JD Pulsford
Keyword(s):  
Schiff Base ◽  
Nickel Complex ◽  
Ligand Substitution ◽  
Steric Effects ◽  
Schiff Base Ligands ◽  
Initial Concentration ◽  
Tetradentate Schiff Base ◽  
High Initial Concentration ◽  
Leaving Groups ◽  
Complex Ligand

The large variations in the rates of the copper(II)-promoted solvolyses of various nickel(II) complexes, containing Schiff base ligands with varying diamine substituents, is attributed to steric effects. The important rate differences occur for reactants whose stereochemistries and electronic properties appear little different. However, the steric effects cannot be viewed definitely from either nickel-diamine dissociation or copper-diamine formation. Nickel reactants which may be distorted from planarity give trimeric products on reaction with copper in dmso and dmf, if the reactions are carried out at high initial concentration ratios of copper(II) to nickel complex. Ligand substitution studies indicate a differing reactivity sequence for the diamine-substituted ligands in their capacities as entering, compared to leaving, groups.

Tridentate and unsymmetrical tetradentate Schiff base ligands from salicylaldehydes and diamines: Their monomeric and dimeric nickel(II) complexes

1978 ◽  
Vol 31 (1) ◽  
pp. 35 ◽  
Author(s):  
RC Elder
Keyword(s):  
Schiff Base ◽  
Nickel Complex ◽  
Schiff Base Ligands ◽  
Tridentate Ligands ◽  
Spectroscopic Evidence ◽  
Tetradentate Schiff Base ◽  
Dimeric Complexes

A series of ligands has been formed by the 1 : 1 molar condensation of salicylaldehyde (sl) with the diamines, propane-1,3-diamine (p), butane-1,4-diamine (b) and 2,5-dimethylhexane-2,5-diamine (d). The potentially tridentate ligands are o-[N-(3- aminopropyl)formimidoyl]phenol (Hslp), o-[N-(4- aminobutyl)formimidoyl]phenol (Hslb) and o-[N-(4-amino-1,1,4- trimethylpentyl)formimidoyl]-phenol (Hsld), respectively. These form the bis-nickel(II) complexes Ni(slp)2, Ni(slb)2 and Ni(sld)2. All appear to have octahedral structures in the solid. Ni(slb)2 occurs in yellow and green forms in the solid. In solution Ni(sld)2 occurs in equilibrium between tetrahedral (amines uncoordinated) and an octahedral centrosymmetric form with facially bound sld ligands. Ni(slp)2 reacts with bis(5-chloro-salicylaldehyde)nickel(II) to give the unsymmetrical four-coordinate nickel complex formed from the 1 : 1 : 1 molar condensation of salicylaldehyde, propane-1,3-diamine and 5- chlorosalicylaldehyde. A dimeric, amido bridged complex has been produced by the vacuum thermolysis of Ni(slp)2. Mass spectroscopic evidence is cited for the formation of the analogous dimeric complexes from Ni(slb)2 and Ni(sld)2.

Tetranuclear Copper and Mononuclear Nickel Complex of the Schiff Base of (3Z)-3-Hydrazonobutan-2-One Oxime with Different Aromatic Carbonyl Compounds: Synthesis, Single Crystal X-Ray Structure, Catecholase Activity, Phenoxazinone Synthase Activity, Catalytic Study for the Homocoupling of Benzyl Amines

2019 ◽  
Author(s):  
Swaraj Sengupta ◽  
Sahanwaj Khan ◽  
Shyamal K. Chattopadhyay ◽  
Indrani Banerjee ◽  
Tarun K. Panda ◽  
...  
Keyword(s):  
Schiff Base ◽  
Single Crystal ◽  
Copper Complex ◽  
Carbonyl Compounds ◽  
Nickel Complex ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Phenoxazinone Synthase ◽  
Catecholase Activity ◽  
Aromatic Carbonyl Compounds

Synthesis and characterisation of one trinuclear copper complex, ([Cu<sub>3</sub>L<sub>3</sub>O]ClO<sub>4</sub>) (<b>1</b>) and one nickel complex ([Ni(L'H)<sub>2</sub>(dmso)<sub>2</sub>](ClO<sub>4</sub>)<sub>2</sub>) (<b>2</b>) with Schiff base ligands: (3Z)-3-((Z)-(1-(thiophen-2-yl)ethylidene)hydrazono)butan-2-one oxime (LH) and 1-(pyridin-2-yl)ethylidene)hydrazono)butan-2-one oxime (L<sup>'</sup>H). <b>1</b> shows high catecholase activity and has also been tested as a catalyst for the synthesis of benzylimine. <b>2 </b> shows phenoxazinone synthase activity.

Copper(II) complexes with tridentate halogen‐substituted Schiff base ligands: synthesis, crystal structures and investigating the effect of halogenation, leaving group and ligand flexibility on antiproliferative activities

2021 ◽  
Author(s):  
Nazanin Kordestani ◽  
Hadi Amiri Rudbari ◽  
Alexandra R Fernandes ◽  
Luís R Raposo ◽  
André Luz ◽  
...  
Keyword(s):  
Schiff Base ◽  
Anticancer Activity ◽  
Crystal Structures ◽  
Copper Complexes ◽  
Schiff Base Ligands ◽  
Leaving Group ◽  
Leaving Groups ◽  
Tridentate Schiff Base ◽  
Antiproliferative Activities

To investigate the effect of different halogen substituents, leaving groups and the flexibility of ligand on the anticancer activity of copper complexes, sixteen copper(II) complexes with eight different tridentate Schiff-base...

ChemInform Abstract: High-valent Manganese Complexes of Tetradentate Schiff Base Ligands.

1986 ◽  
Vol 17 (38) ◽  
Author(s):  
C. A. MCAULIFFE ◽  
R. V. PARISH ◽  
S. M. ABU-EL-WAFA ◽  
R. M. ISSA
Keyword(s):  
Schiff Base ◽  
Manganese Complexes ◽  
Schiff Base Ligands ◽  
Tetradentate Schiff Base ◽  
High Valent
Sign in / Sign up

Export Citation Format

Share Document