Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1999-05-24
2000-11-21
Nazario-Gonzalez, Porfirio
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
556136, C07F 100, C07F 1500
Patent
active
061505455
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to novel chemical substances constituting organo-metal complexes which reduce and deposit metals by firing, and more particulary to metal acetylide compounds which contain no sulfur or chlorine and are therefore clean with respect to the environment by not emitting environmental contaminants such as sulfurous acid gas or chlorine compounds, etc. during manufacturing and firing and further to a method for manufacturing such compounds.
BACKGROUND TECHNOLOGY
Ordinarily, in cases where electrodes are formed on insulating substrates or semiconductors, a method is used in which: a metal paste containing an organo-metal complex of gold or platinum, etc. is prepared; this metal paste is applied as a coating in a prescribed pattern; and the pattern is fired so that the organic component is scattered, thus causing reductive deposition of the metal so that metal electrodes of the pattern are formed. Fields in which organo-metal complexes are used are not limited to this semiconductor industry; such complexes are currently widely used in a variety of fields such as electronic devices, ceramics and art, etc.
Conventionally, such organo-metal complexes include, for example, terepineolrhodium sulfide (C.sub.10 H.sub.18 SRhCl.sub.x), terepineolplatinum sulfide (C.sub.10 H.sub.18 SPtCl.sub.x) and terepineolpalladium sulfide (C.sub.10 H.sub.18 SPdCl.sub.x), etc. These compounds are also known by the abbreviated names of rhodium balsam, platinum balsam and palladium balsam. In addition, precious metal balsams such as gold balsam and ruthenium balsam, etc. are also known.
Methods in which a terpene type compound is reacted with sulfur to produce a terpene type balsam, after which an organo-metal complex is manufactured by reacting hexachlororhodium (H.sub.3 RhCl.sub.6), hexachloroplatinum (H.sub.2 PtCl.sub.6) or hexachloropalladium (H.sub.2 PdCl.sub.6) with this terpene type balsam, are known as methods for manufacturing such organo-metal complexes.
Such conventional organo-metal complexes involve problems. First of all, recent environmental problems, especially problems of atmospheric contamination, have been caused by NO.sub.x and SO.sub.x, and chlorine compounds are not an exception in this regard. In order to protect the environment in plants and areas where such gases are handled, the installation of desulfurizing equipment has become a must. Since sulfur is used in the manufacturing stage of the organo-metal complexes, there is a danger that SO.sub.2 gas will be generated. Furthermore, organic matter is decomposed in the firing stage in which such complexes are used in the form of a metal paste, so that SO.sub.2 gas and chlorine compounds, etc. are discharged. Accordingly, extensive equipment is required in order to maintain a clean environment, and the complete avoidance of gas leakage accidents has been difficult. Another problem is that residual impurities such as sulfides and chlorine compounds tend to remain on the surfaces of physical objects after firing.
Secondly, in the manufacturing process, sulfur is injected into terpene type compounds (which are organic solvents), and terpene type balsams are gradually produced while the mixture is heated for a long period of time, i. e., 20 to 30 hours. Accordingly, the difficulty of controlling chemical reactions in the solvent over a long period of time has also been encountered.
DISCLOSURE OF THE INVENTION
The present invention was devised in order to overcome the above-described drawbacks. More specifically, the present invention proposes novel organo-metal complexes comprising three to four elements which contain a metal, carbon, hydrogen and in some cases oxygen, i.e., organo-metal complexes which do not contain sulfur or chlorine that are harmful to the environment.
The novel organo-metal complexes of the present invention are metal acetylide compounds which can be expressed by the general formula M(--C.tbd.C--R).sub.n (in this formula, M indicates a metal atom, n indicates the valence number of the metal atom M,
REFERENCES:
patent: 3800030 (1974-03-01), Long
patent: 4835272 (1989-05-01), Sato et al.
Author: The American Chemical Society Title: "Chemical Abstract", Abstract. No. 91946h Date: Oct. 15, 1973 Pertinent Page: 416.
Author: Allan T. Casey and Angelica M. Vecchio Title: "The electrochemical synthesis of metallocenes, polymethylmetallocenes, open metallocenes and metal phenylacetylides" Date: 1990 Pertinent Pages: 513-522.
Harada Akio
Okamoto Yoshiki
Daiken Chemical Co., Ltd.
Nazario-Gonzalez Porfirio
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