Bipyridine and Terpyridine Ligands

The same Py structural unit functionalized with the Os complex (Fig. 3.22) has also been co-polymerized with Th and used in the frame of amperometric biosensing for pyruvate determination [107], taking advantage of the mediation 

Rationale is given to parallel experimental cychc voltammetric and conducti-metric tests in which the ions are either present or absent inside the coordination sphere the results also depend on the nature of the metal and of the Th structural unit. In particular, reversible uptake of Cu(ll) ions by macrocyclic ligands 

Peculiar metallopolymers, seemingly representative of situations intermediate between type 2 and 3 metallopolymers, present the metal co-ordinated to a ligand that is part of the jr-electron chain and completes the co-ordination set with additional external ligands. Similar metallopolymers have been synthesized and characterized, in which the Ru metal is co-ordinated to bipy belonging to the ICP backbone, consisting of bipy and Th basic structural units in a co-polymeric chain [68] (see Fig. 3.24)  

Aware that the response of analytical meaning is, in the case depicted, in terms of conductivity, we firmly believe, however, that amperometric sensing could take advantage of similar effects, e.g., based on the behavior with respect to an electroactive probe in solution, or on some other mechanism. 

Similar systems to those discussed above are found in Ref. [110] and Ref. [111]. In Ref. [Ill], Fe or Ru metal ions are co-ordinated to two bipy ligands, each one interposed between two EDOT units. Polymerization at the extreme EDOT residues occurs, the metal also acting as a bridge between two adjacent oligomeric chains. The shortness of the organic segments between adjacent metal complexes causes the redox conductivity character to largely predominate. A 

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Table 6 compiles the electrode potentials of the chromium complexes with phenantroline, bipyridine and terpyridine ligands, respectively25-27. 

Table II. Effect of other cations in zeolite Y on the complex formation of Co(ll) with bipyridine and terpyridine ligands (7.10" mol Co/g of zeolite Y Co bpy terpy = 1 1 1) (adapted from [10]).

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