Nitrosyls isocyanides

Dinitrogen, Nitrosyl, Isocyanide, and Cyanide Complexes.—Spectroscopic evidence has been presented for the formation of [Mo(CO)5N2] and [W(C0)5N2] complexes subsequent to photolysis of the hexacarbonyls in a nitrogen matrix at 20 The complexes [Mo(N2)(PPh3)2,PhMe] and... 

Partial replacement of isocyanide in [Cr(CNR)6](PF6)2 or [CrCl(CNPh)5]PF6 by phosphines PR3, bis(diphenylphosphino)ethane (dppe) or bis(diphenylphosphino)methane (dppm) provides two series of mixed-ligand complexes (Scheme 4).22,23 The complexes [Cr(CNR)4(dppe)](PF6)2, which must be cis, have more complicated spectra in the v(CN) region than the complexes [Cr(CNR)4(PR3)2](PF6)2j which are therefore trans (Table 3). Nitric oxide reacts with [Cr(CNR)6](PF6)2 to give [Cr(NO)(CNR)5](PF6)2 from which many mixed nitrosyl isocyanide complexes of Cr1 and Cr° can be derived (Section 35.4.2.6). 

Nitrosyl, isocyanide, cis-[Cr(NO)(CNCMe3)(PPh3)]+ Synt., electrochem. 1204... 

The tripalladium mixed-valence Pd3(2/3) and Pd3(4/3), Pd(II) and Pd(0) clusters may be formed with a range of phosphines, isocyanides, or carbonyls as terminal ligands and carbonyls, nitrosyls, isocyanides, sulfur dioxide, phosphides, phosphines or diphosphines, halides, thiolates as doubly or triply bridging ligands. These clusters exhibit a wide range of steric and electronic environments. 

Before reviewing the other physical data on organometallic nitrosyls we now summarize the purely chemical information on the compounds. For convenience the material has been divided into three main categories (a) nitrosyl carbonyls and nitrosyl isocyanides (b) nitrosyl cyano species and (c) cyclopentadienyl and miscellaneous organometallic nitrosyls. 

Similar complexes containing bridging nitrosyl, isocyanide, phosphine, and hydride ligands, are known, see Figure 43. 

Methyl isocyanide, 0759 Nickel(II) cyanide, 0997 Nitrogen oxide, 4724 Nitrogen trichloride, 4143 Nitrosyl chloride, 4023 Nitrogen triodide, 4633 Nitryl chloride, 4025 Nitryl hypolluorite, 4304 Oxygen dilluoride, 4317... 

General behaviors are summarized in Table 1. For ligands such as carbon monoxide, isocyanides (CNR), carbynes, nitrosyl NO+ and, although to a smaller extent, nitriles (NCR), which are not only a donors but also good jr acceptors, the net electron-donor ability is modest or poor and the Pl parameter has a high value. However, ligands that are not involved in jt-bonding, such as ammonia (NH3) and pyridine, exhibit lower Pl values that, nevertheless, are usually not... 

NO, Nitrosyls, molybdenum and tungsten, 26 132, 133 NOC, Cyanate tungsten complex, 26 42 NOC4H7, 3-Butenamide nickel complex, 26 206 NOC4H , 2-Propenamide, 2-methyl-nickel complex, 26 205 NOC H, Benzoyl isocyanide chromium complex, 26 32, 34, 35 N04ReC16H, Perrhenate, tetrabutylam-monium, 26 391... 

Optically active organometallic complexes have been used to study stereochemical reactions. Substituted cobalt nitrosyl complexes are interesting chiral see Chiral) complexes because they exhibit tetrahedral structures, whereas most optically active organometallic complexes are half-sandwich structmes with octahedral geometries. Diastereomeric cobalt complexes of the type Co(CO)(NO)(L)( L) (L = phosphite or phosphane L = optically active phosphane or isocyanide) have been synthesized from (4) via substitution (Scheme 6). ... 

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