Effect of PAMAM Dendrimer Size and pH on the Electrostatic Binding of Metal Complexes Using Cyclic Voltammetry

2006 ◽  
Vol 39 (21) ◽  
pp. 7372-7377 ◽  
Author(s):  
Agnieszka Kulczynska ◽  
Tony Frost ◽  
Lawrence D. Margerum
Keyword(s):  
Cyclic Voltammetry ◽  
Metal Complexes ◽  
Pamam Dendrimer ◽  
Electrostatic Binding

Metallkomplexe mit Tetrapyrrol-Liganden, LVI [1] / Metal Complexes with Tetrapyrrole Ligands, LVI [1]

1990 ◽  
Vol 45 (4) ◽  
pp. 531-542 ◽  
Author(s):  
Johann W. Buchler ◽  
Jürgen Löffler
Keyword(s):  
Cyclic Voltammetry ◽  
Metal Complexes ◽  
Mass Spectra ◽  
Electronic System ◽  
Porphyrin Ring ◽  
H Nmr ◽  
Double Decker ◽  
Porphyrin Rings

The reaction of tris(2,4-pentanedionato)europium(III) with a porphyrin H2(P)** in boiling 1,2,4-trichlorobenzene affords a so-called “redox mixture” of europium(III) bisporphyrinates, i. e. porphyrin π-radicals of the type Eu(P)2 and sandwiches EuH(P)2 in which one of the porphyrin rings is protonated. Thus, from either tetraphenylporphyrin or its dilithium derivative, or octaethylporphyrin, or a mixture of both porphyrins, the corresponding mixtures of double-deckers with two identical or two differnt porphyrin rings are obtained. The transformation of the redox mixtures into the pure tetraphenylporphyrin derivatives Eu(TPP)2, EuH(TPP)2, and the salt [NBu4] [Eu(TPP),, the separation of the octaethylporphyrin derivatives Eu(OEP)2 and EuH(OEP)2, and the purification of the “mixed” double-decker Eu(OEP)-(TPP) are described. The compounds are characterized by cyclic voltammetry, IR, UV/VIS/NIR, 1H NMR, and mass spectra. The obtained data indicate that the π-electrons of the two porphyrin rings behave as a common electronic system in which a defect electron is delocalized. However, in the “mixed” double-decker Eu(OEP) (TPP) the defect electron is more concentrated on the OEP ring, i. e. the porphyrin ring which is more easily oxidized.

Syntheses of Chelating Tetrazole-Containing Ligands and Studies of Their Palladium(II) and Ruthenium(II) Complexes

1995 ◽  
Vol 48 (9) ◽  
pp. 1625 ◽  
Author(s):  
AJ Downard ◽  
PJ Steel ◽  
J Steenwijk
Keyword(s):  
Cyclic Voltammetry ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Absorption Spectroscopy ◽  
Electronic Absorption ◽  
Ph Control ◽  
Strong Electron ◽  
Ligand Interactions ◽  
Metal Ligand

Eleven chelating tetrazole -containing ligands have been synthesized, and their complexes with palladium(II) and ruthenium(II) prepared. Proton n.m.r. spectroscopy, electronic absorption spectroscopy and cyclic voltammetry have been used to study the nature of the metal-ligand interactions in these complexes. The negatively charged tetrazolate group is shown to be a strong electron donor with very different properties to those of the protonated or alkylated tetrazole group. This leads to pH control of the properties of transition metal complexes containing such ligands.

Electrostatic Binding of Metal Complexes to Electrode Surfaces Coated with Highly Charged Polymeric Films

1980 ◽  
Vol 127 (1) ◽  
pp. 247-248 ◽  
Author(s):  
Noboru Oyama ◽  
Fred C. Anson
Keyword(s):  
Metal Complexes ◽  
Polymeric Films ◽  
Electrode Surfaces ◽  
Electrostatic Binding
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