Precursor chemistry

McMurray L, Holmes AJ, Kuperman A, Ozin GA, Ozkar S (1991) IntrazeoUte semiconductors sodium-23 MAS NMR, thallium(l+) luminescence quenching and far-IR studies of acid-base precursor chemistry in zeolite Y. J Phys Chem 95 9448-9456... 

The conductors, semiconductors, and superconductors that have been discussed are materials that can be prepared via some type of CVD process. In order to prepare each material, a precursor is required. The precursor chemistry of these materials is based heavily on organometallic and inorganic chemistry. Numerous ligand platforms have been investigated for use in the preparation of suitable CVD precursors. 

The purpose of this volume of Topics in Organometallic Chemistry, however, is to highlight recent and emerging directions and aspects of molecular precursor chemistry for advanced inorganic materials rather than give a sys-... 

The second contribution by A. Devi, R. Schmid, J. Muller and R. A. Fischer entitled Materials Chemistry of Group 13 Nitrides reviews the organometalHc precursor chemistry of group-III nitride OMCVD. The authors discuss the various efforts undertaken in the past decade to come up with alternative precursors to compete with the classical system of Ga(CH3)3 and NH3 to grow GaN, which is commercially employed in industry. The potential of the rather exotic organometallic azide compounds as precursors for the nitride materials is critically discussed, showing the limitations and prospects of that approach as well as representing one of the few examples of comprehensive studies on... 

Fischer R. A, Devi A (2000), Precursor Chemistry for OMVPE of group-13 nitrides. Recent Research and Developments in Crystal Growth 2, 61-82... 

Obrien P, Nomura R (1995) Single-Molecule Precursor Chemistry for the Deposition of Chalcogenide(S or Se)-Containing Compound Semiconductors by Mocvd and Related Methods. Journal of Materials Chemistry 5(11), 1761-1773... 

Current interest in saturated Si-N rings stems primarily from the industrial uses of silicon nitride (and related materials), which is a hard, chemically resistant insulator, and as precursors to silicon-nitrogen polymers (poly-silazanes). The formation and precursor chemistry of these polymers are discussed in Section 10.3.3. 

Perovskites AB)/3C2/303 (A = Ba, Sr, B = Zn, Mg, Co, Ni C = Nb, Ta) are promising compounds for microwave applications. It is important to synthesize these complex oxides as pure perovskite phases because the slightest admixture of a second phase hinders drastically the dielectric properties of ceramics, which sinter only at very high temperatures (1400 to 1500°Q. The precursor chemistry resembles greatly that of BaTi03 formation by alkoxide or alkoxide-hydroxide routes. Below we summarize the 3 approaches to the synthesis of these perovskites by the sol-gel method ... 

As a result of these disadvantages, tremendous efforts over the past 20 years have focused on developing chemistries/processes to improve or replace the Yajima process. At this point, as discussed below, several precursors can be synthesized and/or processed to produce phase pure SiC shapes with controlled microstructures that offer the exceptional properties expected of SiC. Thus, this area of precursor chemistry can now be considered to be mature. Consequently, only engineering and/or cost considerations now dictate which precursor systems are useful for a given application. Furthermore, because the general area of SiC precursors has been reviewed in detail6,7, we focus here only on those precursors and processing methods that provide phase pure SiC. 

The text of this chapter on Features of Organolanthanide Chemistry has been geared to the precursor chemistry of potential applications in the fields of catalysis and material sciences, which are certainly two of the most-discussed topics in current publications. However, organolanthanide chemistry has also penetrated other important areas for example, in a text on macrocyclic derivatives the topic probes in life is to be found [92]. 

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