Tridentate Chelate Compounds. IV. Metal Complexes from α-Diketone Mono-α-pyridylhydrazone Type Ligands

1964 ◽  
Vol 3 (4) ◽  
pp. 492-499 ◽  
Author(s):  
Barry Chiswell ◽  
Francis Lions ◽  
Muriel L. Tomlinson
Keyword(s):  
Metal Complexes ◽  
Chelate Compounds

scholarly journals Studies on the Metal Chelate Compounds of Phenazine Derivatives. VI. Metal Complexes of 1-Phenazinemethanol

1973 ◽  
Vol 93 (4) ◽  
pp. 401-405
Author(s):  
YOSHINORI KIDANI ◽  
KATSUMASA ARAKAWA ◽  
HISASHI KOIKE
Keyword(s):  
Metal Complexes ◽  
Metal Chelate ◽  
Chelate Compounds

Bidentate Chelate Compounds. III. Metal Complexes of Some Pyridyl-Imidazole Derivatives

1964 ◽  
Vol 3 (1) ◽  
pp. 110-114 ◽  
Author(s):  
Barry Chiswell ◽  
Francis Lions ◽  
Benjamin S. Morris
Keyword(s):  
Metal Complexes ◽  
Imidazole Derivatives ◽  
Bidentate Chelate ◽  
Chelate Compounds

scholarly journals Aromatic properties of 8-hydroxyquinoline and its metal complexes

2013 ◽  
Vol 11 (5) ◽  
pp. 655-663 ◽  
Author(s):  
Krzysztof Zborowski ◽  
Miquel Solá ◽  
Jordi Poater ◽  
Leonard Proniewicz
Keyword(s):  
Metal Complexes ◽  
Metal Ion ◽  
Neutral Molecule ◽  
Electronic Systems ◽  
Chelate Complexes ◽  
Chelate Compounds ◽  
Metallocyclic Ring ◽  
The Stability

AbstractChelatoaromaticity (aromaticity of chelate complexes) has been recently recognized as an important property influencing the stability of chelate compounds. In this paper, aromaticity of various forms of 8-hydroxyquinoline (anion, neutral molecule, zwitterion and cation) as well as its chelate complexes with magnesium and aluminium ions are investigated. Aromatic properties of these compounds are analyzed using several aromaticity indices based on energetic, geometric, magnetic and electronic physical manifestations of this phenomenon. Results of performed calculations have shown different aromatic properties for the two rings (pyridine and benzene) occurring in the studied ligand. Aromaticity of these rings in metal complexes of 8-hydroxyquinoline is significantly higher than that in corresponding ligand anion. This means that during complexation the aromaticity of the ligand increases and the chelatoaromatic effect stabilizes the studied metal complexes. In contrast, metallocyclic rings of studied metal complexes have non-aromatic properties, and, consequently, the metallocyclic ring is not stabilized by chelatoaromaticity. We conclude that, in the complex, every 8-hydroxyquinoline unit and the metal ion are separated p-electronic systems.

Metallkomplexe mit biologisch wichtigen Liganden, CXXVIII [1], Palladium(II)-Komplexe mit deprotonierten Peptidestern als N,N′-Chelatliganden / Metal Complexes with Biologically Important Ligands, CXXVIII [1]. Palladium(II) Complexes with Deprotonated Peptide Esters as N,N′-Chelate Ligands

2000 ◽  
Vol 55 (9) ◽  
pp. 855-862 ◽  
Author(s):  
Winfried Hoffmüller ◽  
Roland Krämer ◽  
Michael Maurus ◽  
Kurt Polbom ◽  
Wolfgang Beck
Keyword(s):  
Amino Acid ◽  
Metal Complexes ◽  
Coordination Sphere ◽  
Acid Ester ◽  
Amino Acid Ester ◽  
X Ray Diffraction ◽  
Open Chain ◽  
X Ray ◽  
Chelate Compounds ◽  
Peptide Esters

Reactions of chloro bridged palladium compounds with di- and tripeptide esters give (Et3P)(Cl)2Pd(NH2CHR1CONHCHR2CO2CH3) and the N,N′-chelate compounds (Et3P)- (Cl)Pd(NH2CH2CONCHR1 CO2R2), [C6H4CH 2NMe2(C,N)]Pd(NH2CH2CONCH2CO2Et) and (Et3P)Pd(gly-gly-glyOMe-2H+). The structure of (Et3P)(Cl)Pd(gly-alaOMe-H+) was determined by X-ray diffraction analyses. Attempts to form open chain peptides from α-amino acid ester in the coordination sphere of palladium(II) are reported

scholarly journals Studies on Metal Chelate Compounds of Phenazine Derivatives. VIII. Metal Complexes of 1-Hydroxyphenazine

1973 ◽  
Vol 93 (9) ◽  
pp. 1089-1093 ◽  
Author(s):  
YOSHINORI KIDANI ◽  
KENJI INAGAKI ◽  
HISASHI KOIKE
Keyword(s):  
Metal Complexes ◽  
Metal Chelate ◽  
Chelate Compounds
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