Dendrimer complexes: Fine control of metal assembly in macromolecules

Abstract

New phenylazomethine dendrimers have been developed, with each dendrimer having a unique single structure. From ultraviolet–visible absorption spectra, we determined that stannous chloride added to dendritic polyphenylaz omethine (DPA) was assembled in a stepwise manner from the core shell to the periphery. The selective binding was achieved by the electron density gradient formed in the dendrimer, and it was confirmed by shell‐selective imine reduction, transmission electron microscopy, and NMR measurements. The complex formation constants of the respective shells were estimated to be considerably different by a simulation analysis of ultraviolet–visible absorption spectra. The reversible assembly and release of iron into and out of the dendrimer were possible by electrochemical oxidation and reduction, respectively. DPA with a porphyrin at the core was found to function as an effective reduction catalyst of carbon dioxide. DPA with aryl amine at the core was demonstrated to function as a hole‐transporting material in electroluminescent devices. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3719–3727, 2005

Iron‐Containing Poly(propylene imine) Dendromesogens with Photoactive Properties

“…[33,34] In order to prove such an arrangement of iron centers, the Japanese scientists [34] carried out a stepwise complexation control with continuous monitoring the reaction by UV absorption spectra. This approach is very time-consuming and is not always acceptable.…”

Influence of the structure of nanoscopic building blocks on the assembly of micropatterned surfaces

“…The controlled assembly of (macro)molecules into well-defined objects of nano-or micrometer scales is an area of current interest in materials science, fundamentally and technologically. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] For example, the assembly of conjugated polymer segments allows the tuning of their optoelectronic properties, [17][18][19][20][21][22][23][24][25][26] and micropatterned films have demonstrated potential for applications in antifouling/fouling release coatings. 27 Key developments in the preparation of micropatterned films have typically involved methods that employ a template that is prepared by some form of lithography.…”

Pd(II)‐catalyzed base‐free oxidative homocoupling of fluorene diboronic acid ester: A new approach for the synthesis of π‐conjugated polymers

“…Until now, there have been two main types of procedures for the preparation of p-conjugated polymers. One is transition metal-catalyzed condensation, including the use of Ullman, 28 Yamamoto, 29 Suzuki, 30 Kumada, 31 and Stille reaction. 32 Another is oxidative coupling directly from electron-rich monomers under a condition of either with an oxidant (FeCl 3 ) 33,34 or electrochemical condensation.…”