Resonance unresolved

Two chiral opioid analgesics have been examined. Inclusion of (R,S)-oc-aprodine into )S-cyclodextrin resulted in increased complexity of its aromatic proton resonances (unresolved) and clear duplication of the ester methyl 2md... 

The spectral properties of the product are as follows infrared (neat) cm.-1 3268, 1377, 1037 proton magnetic resonance (carbon tetrachloride) d, multiplicity, number of protons 0.88 (multiplet, 6), 1.38 (multiplet, 7), 3.33 (unresolved doublet, 2), 5.14 (broad singlet, 1). 

Each of the eight hyperfine resonances is an unresolved quadmpole doublet, due to the quadmpole interaction of Os in the hexagonal Os metal source. The authors have interpreted the hyperfine fields in terms of core polarization, orbital and spin-dipolar contributions. 

The H-NMR spectrum of 2 in CDCI3 (Figure 1) exhibits broad unresolved resonances in the aromatic region similar to those found in the monomer. Broad signals with lack of resolution are consistent with magnetic non-equivalence of the methyl group protons resulting from a mixture of triad tacticities. 

In all smectites examined, the four well-separated resonances of g(l were observed in the 90° orientation, while the largely unresolved resonances of gj were observed in the 0° orientation. 

It was therefore postulated that one of the two expected minor resonances was unresolved from the linear dextran anomeric resonance. For dextran B-742 fraction S there are essentially no normal linear dextran 6-0-substituted a-D-glucopyranosyl residues, only branch-point and terminal residues -- and one of the two approximately equal resonances appears at the same chemical shift as the linear dextran anomeric resonance. 

An area where we see increasing applicahon is in cancer diagnosis and treatment. Currently, there is much effort on characterizing breast and prostate cancer using either single- or mulh-voxel MRS. This effort focuses primarily on phosphahdylcholine metabolism, as represented by the resonance assigned to "total choline", which arises from unresolved PC, GPC, and choline. If sufficient spatial resolution and speed can be realized from high fields and instrumental advances. 

ESR Spectroscopy. Electron Spin Resonance spectroscopy is an important technique for investigating the role of radical intermediates in radiation chemistry. The technique has been used widely for many years in the study of radicals occurring in irradiated solid polymers (.6,7). However, by their very nature, such species are reactive and may only exist in low concentration. The identification of these species can also be a problem since in the majority of polymers the environment of the radicals leads to broad, unresolved ESR spectra, which makes detailed spectral analysis difficult. In recent years, many of these problems of sensitivity and resolution have been reduced by more sensitive and stable ESR spectrometers and by development of new methods of data handling and manipulation. 

At 55 kHz field, where relaxation times should indicate molecular motion, the relaxation times of the methyl groups showed a temperature dependence between —30 °C and 50 °C. An unresolved peak containing methylene and methine resonances showed a very weak temperature variation. Garroway et al. 62) concluded that the observed C-13 Tle values for fields above 40 kHz were not dominated by spin-spin effects for the DGEBA-PIP system. 

Figure 16. Scattering resonances of the full rotational-vibrational Hamiltonian describing the dissociation of CO2 on a LEPS surface obtained by equilibrium point quantization with (2.8). The resonances with 7 = 0,..., 10 are given by dots. Their close vicinity explains the formation of hyphens , i.e., unresolved sequences of dots. Note that rotation is very slightly destabilizing in the present model. The successive hyphens are the bending progressions with V2 = 0,. .. 5. The solid line is given by the Lyapunov exponent of the symmetric-stretch periodic orbit 0 expressed as an imaginary energy.

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