Nitrosyl complexes chromium

Dicarbonyl Nitrosyl Complexes Chromium, Molybdenum, and Tungsten 197... 

Chromatography cyclophosphazenes, 21 46, 59 technetium, 11 48-49 Chromites, as spinel structures, 2 30 Chromium, see Tetranuclear d-block metal complexes, chromium acetylene complexes of, 4 104 alkoxides, 26 276-283 bimetallics, 26 328 dimeric cyclopentdienyl, 26 282-283 divalent complexes, 26 282 nitrosyls, 26 280-281 trivalent complexes, 26 276-280 adamantoxides, 26 320 di(/ >rt-butyl)methoxides, 26 321-325 electronic spectra, 26 277-279 isocyanate insertion, 26 280 substitution reactions, 26 278-279 [9]aneS, complexes, 35 11 atom... 

Nitrosyl-aryl porphyrin complexes, with iron, 6, 107 Nitrosyl complexes with chromium, 5, 301 with manganese, 5, 773... 

Polyselenido nitrosyl complexes, with chromium, 5, 303 Polysilane high polymers... 

Polysulfanides, in Ru and Os half-sandwich complexes, 5-Gp and 7 5-indenyl compounds, 6, 496 Polysulfide rings, with germanium, 3, 742-743 Polysulfides, in Ru and Os half-sandwich complexes, rjS-Cp and ]5-indenyl compounds, 6, 496 Polysulfido nitrosyl complexes, with chromium, 5, 303 Polytetrafluoroethylene valves, in high vacuum lines, 1, 198 Polythiaether macrocyclic ligands, in hexaruthenium carbido clusters, 6, 1018-1019... 

Some cyclopentadienyl-/x-mercapto-, -alkoxo-, and /a-dialkylamido-chromium nitrosyl complexes (VI)-(X) have been studied by Preston and Reed 167). 

The chemistry of the dicarbonyl(7 -cyclopentadienyl)nitrosyl and the chloro-(i7 -cyclopentadienyl)dinitrosyl complexes of chromium, molybdenum, and tungsten [i.e., fT -CsHs)M(CO)j(NO)] and [(i7 -CsHs)M(NO)2Cl] has not been studied extensively, partly because of the various difficulties associated with their preparation. The procedures described below are of general applicability to all three metals and lead to the desired compounds in high yields. The carbonyl nitrosyl complexes are the synthetic precursors of the chloro nitrosyl complexes and so their preparation is described first. 

A. DICARBONYL(t -CYCLOPENTADIENYL)NITROSYL complexes of CHROMIUM, MOLYBDENUM, AND TUNGSTEN... 

Nitrosyl Complexes of Chromium(III) with Dipy and Phen 183... 

Table 64 Some Properties of Macrocyclic-chromium Nitrosyl Complexes ...

A direct, quantitative, and convenient method for the preparation of [Cr(H20)5N0] has been achieved by the slow, dropwise addition of an aqueous solution of Cr° (10 ml, 0.5 mol 1" ) to a stirred solution of HCIO4 (200 ml, 0.1 mol 1" ) which was continuously saturated with NO. This reaction is rapid and produces only [Cr(H20)5N0] , provided that NO is in excess. This study also confirmedthe previously reported d-d spectrum of this ion. Several e.s.r. studies of chromium nitrosyl complexes containing a variety of other ligands have been reported. The i.r.-polarized spectra of K3[Cr(CN)5N0],2H20 have been determined and the results strongly support the suggestion that the orientation of the anions is disordered. The salts K4[M(CN)5N0] (M = Cr or Mo) appear to be isomorphous and the assignment of the vibrational modes in these ° and related compounds has been discussed. ... 

The NO complexes of chromium that have been reported to date exist in the nitrosyl forms. In coordination complexes in particular, several compounds of configuration Cr(NO) have been isolated these have been reviewed recently (80,81). In a 2005 review. Ford and coworkers noted that photolysis of some Fe, Mn, and Cr nitrosyl complexes often leads to the dissociation of the nitrosyl ligands (82). For example, photolysis of the [(H20)5Cr(N0)] complex under anaerobic conditions, and in the... 

Figures 7,8 shows plots of data for chromium and molybdenum nitrosyl species the slope with El(L) is essentially the same as for non-NO species. Thus, in Figure 7,8 [data from 10,31,32], a value for El(NO) is used which will cause the nitrosyl complexes to fit the correlation line. This yields El(NO + ) = 2.55 - 2.57 for both metal ions. Values in the range 1.2 -1.8, for El(NO" "), have been described by Clarke [33] for some technetium nitrosyl derivatives. This area would benefit from a detailed analysis.

Chromium nitrosyl complexes, [Cr(S2CNR2)3(NO)], are somewhat less thermally stable than their molybdenum and tungsten counterparts heating [Cr(S2CNMc2)3(NO)] in toluene for 3 h leads to the formation of cis-[Cr(NO)2(S2CNMe2)2] and [Cr(S2CNMe2)3] (752). Somewhat contradictory reports siuround the electrochemical behavior of [Cr(S2CNR2)3(NO)]. Connelly and co-workers (752) report that they show no redox chemistry between 1.5 V,... 

A series of chromium(II) nitrosyl complexes, [Cr(NO)(S2CNR2)2L] (L = H2O, thiourea), have been prepared, the thiourea resulting from dithiocar-bamate degradation (756). They are characterized by ESR spectroscopy, which suggests that the thiourea hes trans to the nitrosyl. 

---