Thallium complexes cationic derivatives

Reaction of the anion 21 with Cp or Cp metal fragments provides further metallocene-type complexes with a pendant phosphaferrocene side-chain. For example, the reaction of the thallium derivative T1 21 with [Cp RhCl2]2 yields the cationic pentamethylrhodocenium 24 as its chloride (Scheme 1.5.10). This is an interesting species because it is a chiral water-soluble P ligand. The chloride anion can be exchanged by PF,s to make the compound more soluble in organic solvents. 

The lithium and thallium (I) salts of i satin-3-oxime (isatin oximates) were employed in the development of ion-selective electrodes for these cations. Transition metal complexes of isatin derivatives can also be employed as catalysts for the oxidative self-coupling of alkylphenol s639,640. 

Bromothallate(III) complexes also show variable coordination numbers and structural diversity for the thallium(III) ion. >591,602-605 x-ray data, supported by Raman analysis, showed that the [TlBrs] ion of 1,1,4,4-tetramethylpiperazinium and A,A -dimethyltriethylenediammonium salts adopts a trigonal-bipyramidal geometry. " Compounds derived from 4,4 -dimethyl-2,2 -bipyridi-nium cation contain unusual bromothallate units, with four short T1—Br bonds and one long T1—Br interaction. The A-methyl-l,3-propanediammonium salt of [TlBrs] is known. The X-ray... 

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