Ten-Coordinate Neodymium(III) Complexes with Triethylenetetraaminehexaacetic Acid

2006 ◽  
Vol 2006 (9) ◽  
pp. 1859-1867 ◽  
Author(s):  
Anna Mondry ◽  
Przemysław Starynowicz
Keyword(s):  
Triethylenetetraaminehexaacetic Acid

scholarly journals Complex Formation with Triethylenetetraaminehexaacetic Acid. II. Mercury Chelates.

1966 ◽  
Vol 20 ◽  
pp. 881-891 ◽  
Author(s):  
Knut Henning Schrøder ◽  
Sune Delin ◽  
Gerhard E. Miksche ◽  
E. Kulonen ◽  
J. Brunvoll ◽  
...  
Keyword(s):  
Complex Formation ◽  
Triethylenetetraaminehexaacetic Acid

Metal – Aminopolycarboxylic Acid Complexes. II. Studies of Triethylenetetraaminehexaacetic Acid and its Lead(II) Complexes in Aqueous Solution by Proton Magnetic Resonance Spectroscopy

1971 ◽  
Vol 49 (12) ◽  
pp. 2086-2095 ◽  
Author(s):  
P. Letkeman ◽  
J. B. Westmore
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Proton Magnetic Resonance Spectroscopy ◽  
Equilibrium Constants ◽  
The Other ◽  
Resonance Spectroscopy ◽  
Carboxylate Groups ◽  
Triethylenetetraaminehexaacetic Acid ◽  
Nitrogen Bonds ◽  
Aminopolycarboxylic Acid

Nuclear magnetic resonance (n.m.r.) spectroscopy was used to determine the preferred protonation sites in TTHA. For its 1:1 complex with Pb(II) the following equilibrium constants for protonation were obtained (triethylenetetraaminehexaacetic acid ≡ H6A)[Formula: see text]The non-protonated complex is considered to have four coplanar (or nearly coplanar) metal–nitrogen bonds with the center carboxylate groups coordinated above and below this plane, and with the terminal carboxylate groups playing only a small part in the coordinate bonding. The first and second protonations of the complex occur preferentially at the terminal and center nitrogen atoms, respectively, on the same side of the complex, accompanied by breaking of the respective metal–nitrogen bonds. This causes partial unwrapping of the complex from one side. Rapid interconversion between configurations in which unwrapping and rewrapping occurs first from one side of the molecule and then from the other leads to simplified n.m.r. spectra.

New Organometallic and Coordination Chemistry Routes Towards Unsupported and Silica-Supported Bismuth-Based Oxide-Type Materials

1998 ◽  
Vol 547 ◽  
Author(s):  
M. Devillers ◽  
S. Lebrun ◽  
O. Tirions ◽  
H. Wullens
Keyword(s):  
Coordination Chemistry ◽  
Organic Solvents ◽  
Organometallic Compounds ◽  
Bismuth Molybdates ◽  
Triethylenetetraaminehexaacetic Acid

AbstractCoordination and organometallic compounds containing bismuth, lanthanum or molybdenum are used as precursors for the preparation of unsupported or silica-supported Bi-based oxides. Bismuth (III) and lanthanum (III) polyaminocarboxylates, and more specifically homo- and heteropolymetallic complexes of triethylenetetraaminehexaacetic acid (H6ttha) are shown to constitute adequate precursors for the formation of mixed Bi2-xLaxO3 oxides at moderate temperatures. Silica-supported bismuth molybdates are obtained from impregnation or combined impregnation-deposition procedures involving Bi ß-diketonates, carboxylates or mixed acetate-Nmethylimidazole Bi complexes, in association with molybdenyl acetylacetonate or heteroleptic carbonyl-pyridine Mo complexes, either dissolved or dispersed in various organic solvents.

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