Dendrimers silicon

Silane dendrimers Silicone dendrimers Polysiloxysilane dendrimers Tetraallylsilane as the zeroth generation five generations synthesized (C4368 H7764Si485)- [272, 273] [274] [275]... 

Entries on new materials, including re-cyclate plastics, fullerenes, hard-surfaced polymers, dendrimers, transflective materials, rapid prototyping materials, silicone nitride, supercritical fluids, bulk molding compounds, conversion coatings, folic acid, replacements for chloro-fluorocarbons ... 

Perrier RJ (2001) Direct Conversion of 5,6-Unsaturated Hexopyranosyl Compounds to Functionalized Glycohexanones. 215 277-291 Frey H, Schlenk C (2000) Silicon-Based Dendrimers. 210 69-129 Forster S (2003) Amphiphilic Block Copolymers for Templating Applications. 226 1-28 Frullano L, Rohovec J, Peters JA, Geraldes CFGC (2002) Structures of MRI Contrast Agents in Solution. 221 25-60... 

Ferrier RJ (2001) Direct Conversion of 5,6-Unsaturated Hexopyranosyl Compounds to Functionalized Glycohexanones. 215 277-291 Frey H, Schlenk C (2000) Silicon-Based Dendrimers. 210 69-129... 

Transfer experiments of the Langmuir films onto solid substrates and the preparation of LB films were investigated for 43. The deposition of films of 43 occurred regularly on quartz sHdes or silicon wafers with a transfer ratio of 1 0.05. The diblock structure of dendrimer 43 also appeared crucial for efficient transfers of the Langmuir films in order to obtain well-ordered multilayered LB films. Effectively, the transfer of the Langmuir films of the dendrimer 42 with the small polar head group was found to be difficult with a transfer ratio of about... 

Regen and Watanabe [158] fabricated multi-layers close to a thickness of 800 A by using fourth or sixth generation PAM AM dendrimers with 16 or 12 cycles, respectively. The construction techniques involved activation with K2PtCl4 on a silicon wafer containing amino groups on the surface, which was followed by deposition of the dendrimer layer. However, elimination of Pt2+ layer resulted in absence of layer growth, as examined by X-ray photoelectron spectroscopy. 

Seyferth and coworkers [181] introduced ethynyl groups onto the periphery of carbosilane dendrimers by displacement of chloride from the terminal silicon groups. They further treated these ethynyl terminated silicon dendrimers with Co2(CO)8 to afford the corresponding acetylenedicobalt hexacarbonyl dendritic complexes. 

Although the first publication on dendrimers appeared in 1978 [ 1 ] it is only in 1990 that the first report on phosphorus-containing dendrimers was published [2] i.e. after numerous papers devoted to the synthesis of organic dendrimers and practically at the same time than the description of a silicon containing dendrimer. 

Especially, the divergent and convergent strategies have been applied to many dendrimer syntheses. Nowadays, there are dendrimers with branching units which are based on silicon, phosphorus and other heteroatoms,1101 dendrimers which are built up supramolecularly (rather than covalently)1111 and even pure hydrocarbon dendrimers.112,131 A dendrimer of the tenth generation with 3072 gold ions at its periphery, which is 15 nanometers in diameter, has been prepared successfully by Majoral et al.1101... 

Concerning the nomenclature of higher-dimensionality silicon polymers such as networks, ladders, cages, and dendrimers, the variety of architectures possible is too great to treat concisely here, and the reader is directed to IUPAC sources.2... 

The dynamics of polysilane dendrimer excited states were also studied by Watanabe as mentioned above in a comparison with polysilynes,360,364 and suggested that a configuration coordinate model is applicable to the photophysics of branched silicon chains. Calculations showed a distorted geometry of the excited state localized at a branching point. 

Son, D. Y. Silicon-Based Dendrimers and Hyperbranched Polymers. In Chemistry of Organic Silicon Compounds-, Rappoport, Z., Apeloig, Y., Eds. Wiley Chichester, 2001 Vol. 3, pp 745-803. 

Krska, S. W. Son, D. Y. Seyferth, D. Organosilicon Dendrimers. In Silicon-Containing Polymers. The Science and Technology of Their Synthesis and Applications-, Jones, R. G., Ando, W., Chojnowski, J., Eds. Kluwer Dordrecht, 2000 pp 615-641. 

Dendrimers with a carbon-silicon core were prepared by a divergent hy-drosilylation - vinylation method followed by methoxylation [72], Hydrolysis and condensation resulted in gels only in the case of generation two dendrimers, while the sol-gel reaction products of generation one were still soluble, apparently due to strong cyclization characteristics of the sol-gel reactions. 

It was found that dendrimer monolayers formed on a silicon surface by all amine-terminated generations are very smooth and homogeneous, with very light, grainy surface morphologies, Figure 12.7(a). The thickness of dendrimer monolayers was measured by the AFM technique from occasional holes in the... 

Dvornic, P. R., de Leuze-Jallouli, A. M., Owen, M. J. and Perz, S. V. Radially layered poly(amidoamine-organosilicon) (PAMAMOS) copolymeric dendrimers in Clarson, S. J., Owen, M. J., Fitzgerald, J. J., Smith, S. D. (eds.), Silicones and Silicone-Modified Materials, ACS Symposium Series, Vol. 729, American Chemical Society, Washington, DC, 2000, pp. 241-269. 

Alonso et al. prepared ferrocenyl silicon dendrimers [67], which could be used as mediators in glucose biosensors, based on glucose oxidase [68, 69], The ferrocenyl units are located at the end of long, flexible, silicon containing branches and serve to electrically connect the enzyme to the electrode. The flexibility of the dendrimer is proposed to play an important role in the interaction with the redox center of glucose oxidase. 

The dendrimers containing more ferrocene units are more interesting from the electrochemical viewpoint. Scheme 6 shows the 1st and 2nd generation members of a silicon-centred series containing four and eight ferrocenyl units, respectively.48... 

---