Complexation behaviour of the f-block, Chemistry

Assignment Help:

Q. Complexation Behaviour of the f-block?

Ions of actinide and lanthanide elements have a strong tendency to form complexes with a variety of oxygen and nitrogen donor ligands. Perhaps, because of their comparatively higher charge to size ratio, the actinide ions have a greater tendency to form complexes than the lanthanides. Also, because of the existence of a large number of oxidation states, the complexation behaviour of actinides is more varied. The lanthanide and actinide ions form the most stable complexes with chelating ligands such as oxalic acid, tartaric acid, citric acid, nitric acid, ethylenediamine tetraacetic acid (EDTA) and 0-diketones. In these complexes the metal ions have very high coordination numbers. For case, the coordination number of the metal ion in [Th(acac)4]. [Ce(N03)4.(OPPh3)2] and  [Ce(N03)6]2- is 8, 10, 12, respectively. In these complexes, the acetyl acetonate (acac) and the nitrate ligands are operating as bidentate ligands occupying two coordination sites around the metal ion. These metal ions form water soluble complexes with citric acid, tartaric acid and EDTA. The formation of water soluble complexes with these ligands facilitates separation of the metal ions by ion exchange chromatography.


Related Discussions:- Complexation behaviour of the f-block

Tendency to form electrovalent bond is largest, The tendency to form electr...

The tendency to form electrovalent bond is largest in (1)  A                                         (2) B (3)  C                                          (4)  D

A covalent bond between two atoms, A covalent bond between two atoms is for...

A covalent bond between two atoms is formed by which of the following: (1) Electron nuclear attraction  (2) Electron sharing  (3) Electron transfer (

Phylum Protozoa, 1. Write an easy on the classification of Phylum Protozoa,...

1. Write an easy on the classification of Phylum Protozoa, a large phylum comprising approximately 50,000 species. (10marks)

Tests for acetone - indigo test and iodoform test, Tests for acetone - Indi...

Tests for acetone - Indigo test and Iodoform test (a) Indigo test: When a small amount of orthonitrobenzaldehyde is added to approximately 2 ml. of acetone and it is diluted al

Oleic Acid in Olive Oil, What is the concentration of Oleic Acid in mg/100m...

What is the concentration of Oleic Acid in mg/100ml (Wt/Vol) in Extra Virgin Olive Oil (EVOO)?

Crystals, what is a crystal and why do crystals have regular faces?

what is a crystal and why do crystals have regular faces?

Lubricants, What r the requirements for a good refractory material

What r the requirements for a good refractory material

Chemical bonding, explain why carbon tetra-chloride does not dissolve in wa...

explain why carbon tetra-chloride does not dissolve in water?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd