Nickel nitrosyl complexes

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... 

Synthesis and structural characterization of [BseMe]Ni(PPh3)(NO), a nickel complex with a bent nitrosyl ligand... 

Coppens and coworkers reported the first experimental evidence for the presence of side-on nitrosyl bound isomer of any group 10 nitrosyl complex MNO ("65j. In their work, they collected X-ray diffraction data sets on a crystal of Cp Ni(NO) (Figure 20) and subjected the same crystal at 25 K to 485 nm light from an Ar laser for 3 h. Analysis of the diffiraction data before and after irradiation revealed the formation of a new species identified as the side-on // -NO bound nickel complex, accompanied by a shortening of the Ni—O distance, a shght shortening of the Ni—N distance, and a tightening of... 

Nickel(II) dithiocarbamate complexes have been known for nearly a century, while since the late 1960s, nickel(TV) complexes have been prepared. These were soon followed by the discovery of nickel(III) complexes, the first crystal-lographically characterized example coming only in 1990 (1465). Most recent work has served to expand these areas, while electrochemical generation of unstable nickel(I) species has also been documented (1466) and the synthesis of a nickel(I) nitrosyl complex has been claimed (379). 

Nitric oxide, like the 7r-allyl group, can act as a 3-electron ligand a number of stable a -cyclopentadienyl nitrosyl complexes are known. The preparations of some of these complexes are shown in Figures 30 and 32. The series tt-CsHsMNO, where M = Ni [28], Pd [194], and Pt [195], is well characterized and the microwave spectrum of the nickel complex shows the synametric structure given in Figure 28, p. 112 [196]. In this molecule, the short Ni-N distance (1-676 0-02 A) indicates considerable multiple bonding. The dinitrosyl n -C5H r(NO)2CI similarly has a short Cr-N bond (1-72 A) [196a]. 

Substituted derivatives of nickelocene, where one ring has been replaced, include the complex cyclopentadienyl nitrosyl nickel [12071 -73-7], (7T-C3H3)NiNO, a red Hquid, mp -41°C. A review of nitrosyl complexes with nickel is available (89). The dimer complex... 

Nitric oxide and iron nitrosyl complexes have been observed in the reduction of nitrite by bacterial nitrite reductases, which contain iron chlorin or iron isobac-terichlorin [151]. A specific nitric oxide reductase also exists to convert NO to nitrous oxide [9]. Iron complexes of chlorins, isobacteriochlorins, and porphyrins, as well as ruthenium and osmium polypyridines, and cobalt and nickel... 

The existence of copper-nitrosyl complexes of biological significance has been briefly discussed here (Section VII). It is worth pointing out that nitrosyl complexes of other metal-containing proteins may form, and that these may be important in understanding the effects of NO on living cells. Nitrosyl complexes of many other metals are well documented (e.g., Werner and Karrer, 1918 Moeller, 1952) and include complexes of nickel, cobalt, and ruthenium. Some such complexes may be less obvious than the paramagnetic and often colorful... 

Only a limited number of cyano and isocyano complexes and mixed carbonyl, nitrosyl and phosphine cyano complexes of nickel(O) have been described so far.16... 

Pseudotetrahedral nickel nitrosyl complexes [NiLNO] have also been reported with the novel ligands dimethyl(3,5-dimethyl-l-pyrazolyl)(2-thioethoxyethoxy)gallato - and (dimethyl(3,5-dimethyl-l-pyrazolyl)(2-dimethylaminoethoxy)gallato .137,138 -... 

The [Ni2(CN)6]4 anion absorbs both CO and NO. In the latter case a nitrosyl complex of nickel(0) results, namely K N CN NO].307 The formulation of the carbonyl compound is dubious.308... 

The nitrosyl complexes of nickel(II) are scarce and less studied than those of nickel(0) (see Section 50.2.5.2) even though they have been known for nearly a century. Selected examples of nitrosyl nickel(U) complexes are reported in Table 58. As early as 1891 it was reported by Berthelot1117 that Ni(O0)4 reacts with gaseous NO giving a blue compound which was later characterized as a pseudotetrahedral complex of nickel(U) having the formula [Ni(OH)3(NO)].1118 This compound is paramagnetic and is formed only if traces of water are present in the reactants. Using a methanolic solution of Ni(CO)4 a methoxo derivative is formed. 

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