Manganese complexes spectra

Iron also has a very complex spectrum and most other points that have been made in regard to manganese apply to this metal. The choice of the most sensitive among the many absorption lines again was made with the help of the photographic technique by Allan (A7). The strongest line is that at 2483.3 A at which sensitivity limits of 0.1 ppm have been obtained, but the line at 3720 A still permits the detection of iron at the 1 ppm level. Especially narrow slit width and high resolution monochromators are necessary for optimal results, because the resonance... 

Suslick and his coworkers examined the shape selective oxidation of alkanes and alkenes catalyzed by the iron and manganese complexes of the bis-pocket porphyrin (Mn(TTPPP) and Fe(TTPPP) where TTPPP is tetrakis(2,4,6-triphenylphenyl)porphyrin) with a variety of oxidants such as mCPBA, PhIO, F5-PhIO [290]. The selectivities for terminal hydroxylation of n-alkanes are found to be very similar. While the details of the reactive intermediates are not clear, a peracid-Fe TTPPP adduct was obtained as a stable complex at -78°C to measure IR spectrum (Vc=o- 1744 cm l) [139]. However, an expected structure of an oxidant-metalloporphyrin complex could be too crowded to react with olefins. Uponwarming the solution temperature up to room temperature, the... 

The crystalline methyl complexes MeM(CO)5, where M = Mn or Re, are stable to oxidation and are thermally stable at room temperature [14,58]. The ethyl and n-propyl analogues of manganese pentacarbonyl are very much less stable [21]. The manganese complex (CO)sMn(CH2)3Mn(CO)s, prepared from Br(CH2)3Br, has an unusual proton magnetic resonance spectrum which suggests that there may be interaction of the hydrogens of the a-carbons with the manganese atom [59]. 

The spectrum of the low-spin manganese(n) complex, [Mn(dppe)2(CO)(CN-Bu)]2+, (dppe = Ph2PCH2CH2PPh2), in a CH2C12/THF glass is shown in Figure 4.4(a).24 The spin Hamiltonian parameters, obtained from least-squares... 

The low-spin manganese(n) complex [Mn(dppe)2-(CO)(CNBu)]2+ gave us a textbook example of a well-behaved ESR spectrum characterized by coincident g- and hyperfine-matrix principal axes. The nearly identical complex [Mn(dppm)2(CO)(CN)]+, (dppm = Ph2PCH2PPh2) (ref. 25) provides us with a good example of non-coincident principal axes. The frozen solution spectrum (Figure 4.8) shows that the parallel features are not evenly spaced. 

Higher Oxidation States of Manganese.—When XeFj is heated with Mnp2 at 120 °C for 60 h, wine-red XeMnFj is formed. Magnetic data suggest that this is a complex of The electronic spectrum of CsjMnF has been... 

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