Metal carbonyl complexes preparation

Selected Transition Metal Carbonyl Complexes Prepared by Microwave Heating... 

Carbonyl Nitric Oxides. Another group of metal-carbonyl complexes, worthy of investigation as CVD precursors, consists of the carbonyl nitric oxides. In these complexes, one (or more) CO group is replaced by NO. An example is cobalt nitrosyl tricarbonyl, CoNO(CO)3, which is a preferred precursor for the CVD of cobalt. It is a liquid with a boiling point of 78.6°C which decomposes at 66°C. It is prepared by passing NO through an aqueous solution of cobalt nitrate and potassium cyanide and potassium hydroxide. ... 

Uson, R., Laguna, A., Abad, J.A. and Dejesus, E. (1983) Preparation Of Monomeric Neutral Or Anionic Tris (Polyfluorophenyl)-Thalbum(III) And Of Anionic Heteronuclear Tris (Polyfluorophenyl)-Thallium Metal-Carbonyl-Complexes. Journal of the Chemical Society, Dalton Transactions, (6), 1127-1130. 

Another route that has been used recently to prepare Ft bimetal-lies (FtRu, i PtNi, and PtCr ) is via metal carbonyl chemistry. In this method, metal carbonyl complexes (either preformed or formed in situ)... 

Hi) Formation of transition metal carbonyl complexes Ashe and Colburn have reported (77JA8099) the synthesis of molybdenum carbonyl complexes of arsenin and antimonin but were unable to prepare bismin complexes because of its lability (Scheme 23). As expected for electron-rich aromatic compounds, both formed six-electron 7r-complexes (113) by a ligand displacement mechanism. Arsenin also forms a two-electron complex (114) analogous to those formed by pyridine, whereas antimonin did not give a similar complex under the conditions of this reaction. 

Metal carbonyl complexes of the type M(CO)4L, where M = Cr, Mo, or W and L is the bidentate 2,7-dimethyl-l,8-naphthyridine, have recently been prepared by Hendricker and Reed.157... 

Naturally, the ideal source of starting materials for homoleptic metal isocyanide compounds is via metal carbonyl complexes, but previously only with the two carbonyls Ni(CO)4 (24) and Co2(CO)g (25) has direct substitution of all carbonyl groups been effected. Recently, however, remarkable discoveries by Coville and co-workers (26-31) on the transition-metal-catalyzed substitution of carbonyl groups in monomeric and cluster compounds have shown that Fe(CNR)s, Mo(CNR)6, and Ir4(CO)5(CNR)7 (32) can be prepared in high yield by stepwise substitution from the parent carbonyl. 

P. Vogel s group studied exhaustively the 5,6,7,8-tetramethylidenebicyclo[2.2.2]octane system and its metal carbonyl complexes. The preparation and CD spectra of tricarbonyl-iron complexes (144-147) were reported333. The chirality of complexes 144 and 146 is due uniquely to the coordination of Fe(CO)3 moieties. The signs of the Cotton effects for (+)-144 and (+)-146 obey the octant rule, as the endo-Ft(CO)j, of 144 and 146 fall in a positive octant, while the second exo-Fe(CO)3 (syn to the carbonyl) lies almost on the XY nodal plane, and thus its contribution is expected to be small. The deuterium-substituted free tetraenone 148, however, showed an anti-octant behavior. The CD spectra of 144 and 146 are strongly temperature and solvent dependent. 

Binary metal carbonyl complexes, with technetium, 5, 835 Binary technetium isocyanides, preparation and properties,... 

The phosphinidenequadricyclane was converted to phosphinidenenorbornadiene by treatment with HgCl2, while its treatment with CuCl2 led to a phosphaallene derivative (equation 86)111,112. Weber and coworkers have prepared phosphaalkenyl metal complexes by reaction of the metal carbonyl complexes with the silyl phosphide 11a (equation 87)113. 

Although boron carbonyls are only stable at very low temperature, H3BCO reacts with hydroxide to give [H3BC02 2. which is stable at room temperature and is normally isolated as the mono sodium salt, Na[H3BC02H] [212], It was patented as a source of CO source for preparation of transition metal carbonyl complexes [213]. It is also a good source of CO for medical applications [214], It readily releases CO at physiological pH. 

Alberto RA (2001) Carbon monoxide source for preparation of transition metal carbonyl complexes. Patent WO 2001/025243... 

In the last three decades of the twentieth century, following Walter Hieber s retirement, four aspects of the research on mono- and polynuclear metal carbonyl complexes found particular attention. These were the preparation of highly reduced carbonyl metallate anions, the generation of stable metal carbonyl cations, the matrix isolation of uncharged metal carbonyls obeying or not the 18-electron rule and, last but not least, the giant metal carbonyl clusters. 

We have reported here the preparations and treatment conditions that are needed to reduce Iron Ions to metallic Iron In zeolites. Although we have not Isolated highly-dis-spersed superparamagnetic Iron particles In zeolites, we have shown that these iron-containing zeolites are active catalysts in Fischer-Tropsch and in olefin isomerization reactions. The added insight that stems from the use of in-situ Mossbauer experiments has led to the preparation of new active catalysts that can be selectively activated. We presently are studying photochemical reactions of other metal carbonyl complexes in zeolites and believe that increased selectivity is a major benefit in these types of reaction. 

Many transition metal carbonyl complexes have been prepared, often inadvertently, by allowing a metal halide or polyhalometallate to react with a ligand in an organic solvent with carbon-oxygen bonds. Indeed, carbonyl abstraction is an important synthetic route to tran5 -[MCl(CO)(PPh3)2] (M = Rh, Ir) or [OsHX(CO)(ZPh3)3] (X = Cl, Br Z = P, As) and related osmium(II) complexes. 

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