Synthesis and crystal structures of arylamidine Ru(III) compounds containing a tetradentate Schiff base ligand from a amine-amine coupling reaction

2021 ◽  
Vol 124 ◽  
pp. 108361
Author(s):  
Li-Juan Luo ◽  
Li-Xin Wang ◽  
Xu Zhang ◽  
Qian-Qian Su ◽  
Jing Xiang
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Coupling Reaction ◽  
Tetradentate Schiff Base ◽  
Amine Amine ◽  
Amine Coupling

Synthesis and Crystal Structures of a New μ-Bis(tetradentate) Schiff Base Ligand and its Mononuclear Iron(III) Complex: Iron(III) Induced Imidazolidine Ring Hydrolysis of Binucleating Schiff Base Ligand

2005 ◽  
Vol 60 (5) ◽  
pp. 520-526 ◽  
Author(s):  
C. T. Zeyrek ◽  
A. Elmali ◽  
Y. Elerman
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Minimum Energy ◽  
Mononuclear Iron ◽  
Tetradentate Schiff Base ◽  
Oxygen Donor ◽  
Distorted Octahedral Coordination Geometry ◽  
Distorted Octahedral

The μ-bis(tetradentate) ligand, [C27H26Cl3N4O4], H3L′, 1,3-bis[N-(5-chloro-2-hydroxybenzylidene)- 2-aminoethyl]-2-(5-chloro-2-hydroxyphenyl)imidazolidine and its mononuclear iron(III) complex, [Fe(L)](ClO4), L = N, N′-bis(5-chloro-2-hydroxybenzylidene)-triethylenetetramine have been synthesized and their crystal structures determined. Minimum energy conformations of the ligand were calculated (MOPAC, AM1) as a function of two torsion angles and the results compared with optimized crystal structure. The ligand (H3L′) reacts with Fe(ClO4)2 · 6H2O in aqueous methanol to form the mononuclear [Fe(L)](ClO4) complex with the imidazolidine ring cleaved by hydrolysis. The complex has an N4O2 donor atom set forming a distorted octahedral coordination geometry around the metal atom as established from a crystal structure determination. The terminal oxygen donor atoms occupy cis positions, and the remaining four nitrogen atoms (two cis amine and two trans imine) complete the coordination sphere.

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