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

Anesthetics - drugs and medicines, Anesthetics: It may be described as ...

Anesthetics: It may be described as those drugs that generate insensibility to the major functions of all types of cell particularly of nervous system. Anesthetics may be categ

Why sky appears blue in colour, Describe the following observations: a....

Describe the following observations: a. Lyophilic colloid is more stable than Lyophobic colloid. b. Coagulation takes place when sodium chloride solution is added to a collo

Photon absorption for ir spectroscopy, Photon absorption for IR spectroscop...

Photon absorption for IR spectroscopy Absorption spectroscopy refers to spectroscopic methods which measure the absorption of radiation, as a function of frequency or waveleng

Transition metals, what is the advantages of preparing interstitial compoun...

what is the advantages of preparing interstitial compounds

Types of titrations - oxidation reduction titrations, Oxidation Reduction T...

Oxidation Reduction Titrations The titrations based upon oxidation-reduction reactions are termed redox titrations. The chemical reactions proceed along with transfer of electr

Coupling reaction - miscellaneous reactions, Coupling reaction - Miscellane...

Coupling reaction - Miscellaneous reactions Phenol couples along with benzene diazonium chloride in existence of an alkaline solution to make a red dye (p-hydroxy azobenzene).

How tetrahedral complex splitting takes place?, The tetrahedral arrangement...

The tetrahedral arrangement of four ligands surrounding the metal ion may be visualized. It is clear that in tetrahedral field, none of the orbitals point exactly towards the ligan

Free radical aromatic substitution - hydrocarbon, Free radical aromatic sub...

Free radical aromatic substitution - Hydrocarbon The aromatic substitution reactions that follow free radical mechanisms are extremely few and have limited synthetic value. Alt

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