controlled assembly of multiple metals. Lewis acidic Sn halide starts a stepwise
coordination to the imines with stronger basicity from the inner layer of the DPAG4pPh, to the adjacent outer layer. Fine-controlled metal assembly was established for
various metal salts such as FeCl 3 and PtCl 4 , VCl 3 , TiCl 3 (acac), and PtCl 4
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(a)
(b)
Fig. 25 Structures of dendritic poly(phenylazomethine) (DPA) with (a) a p-phenylene core ( pPh,
two dendrons) and (b) a tetraphenylmethane core (TPM, four dendrons)
25
+
(b)
(a)
5
Dendrimer
Metal ions
Atom number
Atom number
Fig. 24 Models to assemble the metal ion to dendrimers with (a) random accumulation and (b)
precisely stepwise accumulation
152
M. Tanabe and K. Yamamoto