F—>d spectra

Correlations of electron-transfer and f->d spectra and reduction potentials 273... 

Considering all the spectra from nested tubule samples first, it is clear from Table 1 that the data from four different research groups are in reasonable agreement. The spectral features identified with tubules appear very similar to that of graphite with sample-dependent variation in the intensity in the D (disorder-induced) band near 1350 cm" and also in the second-order features associated with the D-band (i.e., 2 X D <= 2722 cm ) and -f- D 2950 cm . Sample-dependent D-band scattering may stem from the relative admixture of nanoparticles and nanotubes, or defects in the nanotube wall. 

Prediction of the energy level structure for Pu2+ (5f ) is of particular interest since no spectra for this valence state of Pu have been reported. On the basis of what is known of the spectra of Am2+ (26), Cf2" (27), and Es2+ (28), there appears to be evidence for a very small crystal-field splitting of the free-ion levels. Such evidence encourages use of a free-ion calculation in this particular case. The parameter values selected are indicated in Table V. Based on the systematics given by Brewer (19), the first f- d transition should occur near 11000 cm-, so the f- -f transitions at higher energies would be expected to be at least partially obscured. A... 

Preparation of Reagent and Labelling Procedures. The structure of F-D [2-(2,4-diazobicyclo-2,2,2-octyl)-4-(5-aminofluoresceinyl)-6-morpholinyl 1,3,5-triazine] has been confirmed by its FAB-MS, IR, and H-NMR spectra (9). Briefly, F-D was synthesized by the treatment of fluorescamine isomer I with cyanuric chloride, then reaction with morpholine and DABCO (l,4-diazobicyclo-2,2,2-octane), as illustrated... 

Drablos, F. Anal. Chim. Acta 256, 1992, 145-151. Transformation of mass spectra. Elyashberg, M. E., Blinov, K. A., Molodtsov, S. G., Smumyi, E. D. J. Anal. Chem. 63, 2008, 13-20. New computer-assisted methods for the elucidation of molecular structures from 2-D spectra. 

A relative ratio between the 4/ and 4/ 5d-configuration levels energies specifies a sharply distinctive position of broad bands in the spectra of trivalent and divalent rare-earth ions, hi the TR + spectra, with the exception of Ce +, broad bands fall into a relatively far UV region and they yield only fine spectra in the visible and adjacent regions. In the spectra broad bands fall into the visible and near-UV regions. Thus in the case of TR + the f-d and /-/ transitions he close to each other and overlap. Three individual cases are distinguished in the TR + liuninescence spectra, namely broad bands due to d-f transitions, line IR spectra and a combination of bands and fines. 

The interpretation of features comes back to a very wide discussion already taking place for 3 d metals, and, in particular for the case of Ni Partial localization effects should be even more apparent in 5 f-metal spectra, since 5 f s are thought to be intermediate, in behaviour, between the (fairly itinerant) 3d of the iron group and the (fully locaUzed) 4 f of the lanthanides. (The ratios of the Coulomb energy Uh to the bandwidth... 

Fig. 47. In silu study of a-methylstyrene hydrogenation in a fixed bed of Pd/ALO catalyst, (a) Schematic representation of the bed and the chosen axial bar. (b) A mixed spatial-spectral 2-D map which corresponds to that axial bar. (c) The distribution of the liquid phase along the axial bar obtained as an integral projection of (b) on its vertical (coordinate) axis, (d f) NMR spectra of the liquid phase at various heights along the bar obtained as horizontal cross-sections of the map in (b). The location of these cross-sections is indicated in (b,c) with horizontal lines. Each spectrum corresponds to a volume of 0.66mmx 1.3mmx 2mm. The two vertical dotted lines are drawn to show the differences in relative positions of the external peaks in the spectra. Reprinted from reference (69) with permission from Elserier, Copyright (2004).

Figure 17.2. F-NMR spectra of 6FDA based model compounds (a) 6FDA (b) 6FDA/AN DAA (c) 6FDA/AN, and (d) 6FDA TA (Reprinted from C. D. Smith et al., Polymer 34, 4852-4862. Copyright (1993), with kind permission from Elsevier Science. Ltd., The Boulevard, Langford Lane, Killington 0X5 1GB, UK).

Fig. 2.42. I3C NMR spectra of D-camphor in tetradeuteriomelhanol at 15.08 MHz (a). /-modulation of aliphatic carbon signals depending on the decoupling delay z, a verification of Fig. 2.41 (b) proton broadband decoupled spectrum (c-e). /-modulated spin-echo experiments with z = 4, 6, and 8 ms for CH multiplicity analysis (f-g) spectra with off-resonance (0 and gated decoupling of protons (g) for comparison.

Figure 3.49 Examples of solvatochromic plots of absorption spectra, (a) The first absorption band of 4-nitroaniline (charge transfer band), (b) The first absorption band of acetone (n-n band). The ordinates are in units of 103 cm, measured at the band maximum the abcissa are in units of Onsager solvent polarity function f(D)...

Compound 61 can be depicted in a cartoon manner as A in Scheme 6. Our idea was to form the linear f-d-f assembly (B) by simply using a Cu(II), Fe(II) or Zn(II) ion as the bridging unit where these would coordinate to the phen ligand and as such bring two of the lanthanide complexes together. While the formation of a self-assembly was successful, the desired structure (B in Scheme 6) was not exclusively formed. Using Cu(II) we showed that upon addition of 61, at pH 7.4, the Eu(III) emission was switched off. Moreover, the absorption spectra were shifted to the red and the singlet... 

Figure 9.2 Second derivative IR Spectra of lymph node tissue types. Trace A connective tissue of the lymph node capsule. The bands marked by asterisks are typical for collagen. Trace B spectrum observed for mixed tissues, containing collagen features peaks due to phospholipids found in fatty tissue. Traces C and D spectra of T- and B-lymphocytes, respectively. Traces E and F Spectra observed for the tumor areas. Trace E corresponds to the lighter blue area in Figure 9.1(c), whereas trace F corresponds to the darker, and more dense, areas of the tumor.

---