Polycondensation arene complexes

A step-growth polycondensation route has been succesfully devised to prepare novel nickel polymers 207 with arene spacer groups. The procedure involved the polycondensation of the fluorinated dilithiated species 206 and an Ni(ii) complex (Equation (75))." " The rod-like structure of these polymers was established by dilute-solution viscosity measurements, and the results were similar to those reported for the related platinum polyyne polymers 166 (M = Pt(P Bu3)2 x = 2) (Section 12.06.5.2.3). 

The pillar[5] arene dimer described above formed relatively strong host-guest complexes with Unear alkanes, whereas the complexation ability of the corresponding monomeric pillar[5] arene towards linear alkanes was too weak to determine the association constants or stoichiometry of any potential interactions. The dimerization of this pillar[5] arene system therefore enhanced its host-guest ability. Stoddart et al. synthesized one-dimensional tubular assemblies by the polycondensation reaction of pillar[5]arene with A-B units [47]. It is noteworthy that this strategy allowed for the successful formation of one-dimensional tubular arrays containing between two and nine piUar[5]arene molecules (i.e., 2-mer to 9-mer) (Fig. 19.10b). 

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