Nuclear from three

To complete our survey of structurally-characterized oxide-bridged Mn complexes, we describe species with nuclearities >4. Three distinct types have been reported hexanuclear, nonanuclear and dodecanuclear. The hexanuclear complex Mn602(piv)10(pivH)4 results from the treatment of MnC03 with pivalic acid in reflux-... 

Chemically induced dynamic nuclear polarization (CIDNP) was first reported in 1967 in independent work from three different laboratories. The effects of free radicals on NMR spectra were revealed (Fig. 6) in studies of radicals from peroxides (equation 62) and azo compounds, as well as radicals generated from the reaction of alkyl halides and organolithium compounds. ... 

Observed Fractionation in Ground Level Fallout from Three Nuclear Cratering Detonations... 

The electronic equipment used is now commercially available from three or four sources. Ours consisted of a Nuclear Science Instruments Mossbauer spectrometer and a Northern Scientific pulse height analyzer. The spectra we obtained were all fitted (by least squares) by an IBM 360 computer (7) used in a time-shared system. Plots were also computer-produced. All of our spectra, whether obtained by transmission or by scattering, are shown with the ordinate as fractional absorption relative to the off-peak background. 

There are three forms of radioactivity (Table 35.1) arising from three main types of nuclear decay ... 

The next step is to take into account the fact that F depends upon R. Indeed, in the spin-polarized treatment F is a function of both spin density matrices (although the matrices (R0FR0)l> (RoFUo)l> - above are all associated with one spin or the other). The corrections to F due to interaction between fragments come from three sources. Since F depends upon R there will be overlap effects due to ARS and electronic charge redistribution effects due to ARX. In addition, there will be new nuclear-electron attraction terms. In analogy with R (cf., Eq. (7)) we write... 

Eim arises from three types of interactions between electron and nuclear spins. (5) Thus, "/(A-B) can be written as a sum of three contributions,... 

Figure 3.42 Proteomic analysis by mass spectrometry. This mass spectrum was obtained by analy7ing a trypsin-treated band in a gel derived from a yeast nuclear-pore sample. Many of the peaks were found to match the masses predicted for peptide fragments from three proteins (Nupl2Gp. Kapl22p. and Kapl20p) within the yeast genome. The band corresponded to an apparent molecular mass of 100 kd. [From M. P. Rout, J. D. Aitchison, A. Suprapto,...

In an idealized case the gas now comes from three sources (1) the background (or trapped ) noble gas that was present in the rock at the start (2) the radiogenic gas that was produced by radioactive decay within the rock and (3) the gas produced as a parent proxy by the nuclear irradiation. If we let the subscript T refer to an isotopic ratio or the abundance of a particular isotope in the total sample, f refer to the trapped noble gas, and n refer to the gas produced by the nuclear irradiation, then for Xe and Xe we have... 

The compound now formulated as [(OC)3FePMe2Ph]3 was found to be a trinuclear species rather than di- or tetra-nuclear from the similarity of its Mossbauer spectrum to Fe3(CO)i2 [5]. All three iron atoms have shown a change in chemical isomer shift, and this leads one to suggest that one terminal carbonyl group on each iron atom has been substituted. This has since been confirmed by an X-ray crystal structure analysis [28]. 

---