2002
DOI: 10.1038/415509a
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Stepwise radial complexation of imine groups in phenylazomethine dendrimers

Abstract: Dendrimers are highly branched organic macromolecules with successive layers or 'generations' of branch units surrounding a central core. Organic-inorganic hybrid versions have also been produced, by trapping metal ions or metal clusters within the voids of the dendrimers. The unusual, tree-like topology endows these nanometre-sized macromolecules with a gradient in branch density from the interior to the exterior, which can give rise to an energy gradient that directs the transfer of charge and energy from th… Show more

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Cited by 305 publications
(147 citation statements)
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“…For example, F 4 PPh-DPA G3 in which the p-phenylene core is substituted by four electron-withdrawing fluoro groups showed different changes in the isosbestic point from the analogue without fluoro groups (PPh-DPA G3). [102][103][104] Although the usual behavior (shifts of the isosbestic point upon the repeated addition of 2, 4, and 8 molar amounts of SnCl 2 ) was observed for PPh-DPA G3, the isosbestic point during the titration of F 4 PPh-DPA G3 was shifted upon the addition of 4, 8, and 2 molar amounts of SnCl 2 . This indicates that SnCl 2 initially coordinates to four imines in the second shell (intermediate), then coordinates to the eight imines in the third shell (terminal), and finally coordinates to two imines in the first shell (core) as shown in Scheme 3.…”
Section: Fine-controlled Metal Assembling In Dpas (Dendritic Phenylazmentioning
confidence: 97%
“…For example, F 4 PPh-DPA G3 in which the p-phenylene core is substituted by four electron-withdrawing fluoro groups showed different changes in the isosbestic point from the analogue without fluoro groups (PPh-DPA G3). [102][103][104] Although the usual behavior (shifts of the isosbestic point upon the repeated addition of 2, 4, and 8 molar amounts of SnCl 2 ) was observed for PPh-DPA G3, the isosbestic point during the titration of F 4 PPh-DPA G3 was shifted upon the addition of 4, 8, and 2 molar amounts of SnCl 2 . This indicates that SnCl 2 initially coordinates to four imines in the second shell (intermediate), then coordinates to the eight imines in the third shell (terminal), and finally coordinates to two imines in the first shell (core) as shown in Scheme 3.…”
Section: Fine-controlled Metal Assembling In Dpas (Dendritic Phenylazmentioning
confidence: 97%
“…In fact, the band gaps are almost similar for the branched and linear one because of their similar electronic absorption spectra attributed to the cation radical. However, the branched structure is advantageous for electron and hole transfers [2,[13][14][15]. The higher conductivity of the branched polymer results in the formation of a larger amount of polymer with a significantly higher redox activity and catalytic activity for the electron transfer on the electrode.…”
Section: Electro-oxidative Polymerization Of Monomersmentioning
confidence: 99%
“…Covalent modification of the dendritic interior, as highlighted in this review, can be supplemented by other alternative routes. For instance, sophisticated functional gradients throughout dendritic frameworks could elegantly be realized with either intrinsic backbone properties of sequentially elongated phenylacetylene dendrimers 123 or regiospecific complexation 124 and, in some cases, coordination chemistry. 47,48 I am convinced that if exceptional performance is revealed and efficient and modular syntheses are found, more sophisticated dendrimers incorporating a functionalized interior will enjoy a bright future and certainly play a vital role in the creation of the next generation smart materials for tomorrow's technologies.…”
Section: Discussionmentioning
confidence: 99%