Organometallic polymer properties

Gleria M, Bortolus P, Flamigni L, Minto F (1992) In Laine RM (ed) Inorganic and organometallic polymers with special properties. Nato ASI Series E Applied Sciences 206 375... 

Singler, R. E., Sennett, M. S., and Willingham, R. A., Phos-phazene polymers Synthesis, structure, and properties, in Inorganic and Organometallic Polymers (M. Zeldin, K. J. Wynne,... 

Finally, one additional comment concerning the nature of progress from interdisciplinary research is evident from the results reported in this Symposium Volume. Once again it is seen that most rapid progress is made when synthetic chemists collaborate with their colleagues in materials science or physics to determine properties of new inorganic and organometallic polymers. 

It is well known that the mechanical and physical properties of vinyl polymers are dependent upon their stereochemical configuration. It is critical, therefore, that the stereoregularity of poly(TBTM/MMA) be determined accurately and conveniently if the field performance of the material is to be predicted with any certainty. The effectiveness of organometallic polymers as an anti-... 

Yamamoto T Macromol Rapid Commun (2002) 23 583-606 n-Conjugated polymers with electronic and optical functionalities preparation by organometallic polycondensation, properties, and applications... 

The reaction is usually performed in water, but sometimes without solvent or in EtOH, THF, and benzene. Organometallic precursors like diethyl zinc have also been used (in THF at —70 °C). The nature of the precursors does not seem to have any marked influence on the polymer properties of the metal phosphinates. 

Many of the organometallic polymers are semiconductors with bulk resistivities in the range of 10 —10 ° O-cm suitable for specific semiconductor use. Further, some exhibit interesting photo properties. 

Natural and biomedical polymers Organometallic polymers Inorganic polymers Reactions of polymers Rheology (flow properties, viscoelasticity)... 

Sanchez C, Ribot F, Doeuff S. in Inorganic and Organometallic Polymers with Special Properties, R.M.Laine ed, Kluwer Acad. Publ, Amsterdam, 1992, 267. 

The objectives of this article are (i) to give an overview on the compounds prepared mainly during the last five years, (ii) to compare synthetic routes, (iii) to discuss the structures and some structure-property relationships and (iv) to highlight important future directions for organometallic polymers containing germanium, tin and lead, respectively. 

Materials science applications have driven a vigorous search for new organometallic compounds, both molecular3 and polymeric,4 as precursors for new materials. In the case of polymers, this interest is driven by two different end applications. The first is the intrinsic properties of the materials, such as their electronic, photonic, or thermal/mechanical properties. The second is their use as precursors to purely inorganic materials. Organometallic polymers are particularly attractive precursors because of the inherent ease and versatility that they exhibit with regard to processing. 

Besides these monodentate ligands, many multidentate ones have been prepared and used in different fields of chemistry and only a few should be mentioned here. Rigid bidentate benzimidazole-based N-heterocyclic carbenes were successfully used to synthesize main-chain conjugated organometallic polymers 23, an interesting class of materials with desirable electronic and mechanical properties (Fig. 9) [110]. 

T/6-Arene ruthenium and osmium offer specific properties for the reactivity of arene ligand. The activation toward nucleophiles or electrophiles is controlled mainly by the oxidation state of the metal (II or 0). Recently, from classic organometallic arene ruthenium and osmium chemistry has grown an area making significant contributions to the chemistry of cyclo-phanes. These compounds are potential precursors of organometallic polymers which show interesting electrical properties and conductivity. 

In the fields of organometallic polymer see Polymer) chemistry , in which complexes may have particularly interesting physical properties (liquid crystallinity, optical nonlinearity see Nonlinear Optical Materials), etc.), or of molecular electronics , metal alkynyl complexes play a significant role. These areas have been the subject of recent reviews, thus only a brief overview of methods to prepare iron alkynes will be given here. Liu has also recently reviewed the cyclization chemistry of alkynyl organometaUics, including those of iron. ... 

To have a useful preceramic polymer, considerations of structure and reactivity are of paramount importance. Not every inorganic or organometallic polymer will be a useful preceramic polymer. Although preceramic polymers are potentially high-value products if the desired properties result from their use, the more generally useful and practical systems will be those based on commercially available and relatively cheap starting monomers. 

X HE USE OF CHEMICAL APPROACHES to improve the processing, properties, and performance of advanced ceramic materials is a rapidly growing area of research and development. One approach involves the preparation of organometallic polymer precursors and their controlled pyrolysis to ceramic materials. This chapter will review the preparation and application of silicon-, carbon-, and nitrogen-containing polymer systems. However, the discussion is not exhaustive the focus is on systems with historical significance or that demonstrate key technological advances. 

The expectation that organometallics containing ligands with conjugated and delocalized tt systems will provide useful applications for the synthesis of new polyunsaturated organic substrates or serve as precursors to organometallic polymers displaying electronic conductivity and nonlinear optical properties has stimulated intense research efforts into their synthesis and properties. 

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