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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.
Generation of the electrophile : The electrophile is the carbocation produced by protonation of the alcohol oxygen and loss of water.
Characteristic flame colour: specific metals and their salts impart particular colours to Bunsen burner flame. (1) Pb (plumbum) impart pale greenish colour to the f
The mathematical expression used for expressing the rates of chemical reaction is given below by taking two different set of chemical reactions. Reactions involving same s
how does salt bridge works??
styx code of B4H10
In a Ecell, why do you flip the value of the smaller value?
Explain Newman projections The systematic name for "pullane" is 1,1-di-tert-butyl-2,4-diethylcyclopentane. Hence, structures B and C are Newman projections of the same compo
balance?
Beckmann rearrangement Ketoxime while treated with acid at 0° C it goes through rearrangement termed as Beckmann rearrangement. So, acid catalysed conversion of ketoximes t
GFAAS is often necessary to add modifiers in order to increase the sensitivity of the techniques.Giving example explain the principles used in the selection of such modifiers,be ca
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