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Cluster, binuclear

Yeast transcription factor GAL4 contains a binuclear zinc cluster in its DNA-binding domain... [Pg.187]

Marmorstein, R., Harrison, S.C. Crystal structure of a PPRl-DNA complex DNA recognition by proteins containing a Zn2Cys6 binuclear cluster. Genes Dev. [Pg.203]

N-Heterocycles as ligands in dioxygen activation by enzymes containing binuclear nonheme iron clusters 96CRV2625. [Pg.237]

The interaction of small, well defined, rhodium clusters, Rh and Rhs, with O2 has been investigated (220) by matrix infrared, and UV-visible, spectroscopy, coupled with metal/02 concentration studies, warm-up experiments, and isotopic oxygen studies. A number of binuclear O2 complexes were identified, with stoichiometries Rh2(02)n, n = 1-4. In addition, a trinuclear species Rhs(02)m, m = 2 or 6, was identified. The infrared data for these complexes, as well as for the mononuclear complexes Rh(02)x, = 1-2 (229), are summarized in Table XI. Metal-concentration plots that led to the determination of... [Pg.118]

This reaction is diffusion controlled in solid CO. The binuclear carbonyl is unstable and even at these low T decomposes to Ag2 or higher clusters. Similarly, Au forms Au(CO)[ or 2, which does not dimerize. However, Cu cocondensed with CO and Ar forms compounds Cu (CO) (n = 1-4), which after warming to 35 K decompose to larger Cu carbonyl clusters of indeterminate composition, the IR spectra of which resemble CO chemisorbed onto bulk Cu. [Pg.496]

Binuclear Cluster Compounds with the Lantern -Type... [Pg.190]

In compliance with the nuclearity principle, polynuclear clusters are subdivided into a number of other subgroups, e.g. hexanuclear, octanuclear, etc. The binuclear clusters of technetium may be classified according to the electronic structure of their Tc-Tc2 bonds. Then, the d4-d4 complexes with quadruple M-M bonds are the father of all binuclear complexes with Tc-Tc bonds. The addition or removal of electrons from Tc-Tc bonds [1,11] should result in a decrease in the formal multiplicity of M-M bonds. Thus, for instance, the formal multiplicity of Tc-Tc bonds of d3-d3 and d5-d5 binuclear complexes equals3 3, that of d4 d5 and d4-d3 complexes equals 3.5, etc. [Pg.193]

Among other widely used reducers for the synthesis of binuclear technetium complexes with M-M bonds, zinc in HC1 and H3P02 [1,11] are most important. These reducers, as a rule, are used for the synthesis of Re clusters of similar structure. [Pg.194]

Binuclear Technetium Cluster Compounds with the d4-d5 Electronic... [Pg.195]

Compounds 4-7 (Table 1) belong to this group. The physicochemical properties of the given binuclear clusters are close to those of the analogous rhenium and molybdenum compounds with the quadruple M-M bonds and are as a rule isostructural with them [1,89,90]. [Pg.201]

Binuclear Technetium Clusters Compounds with the d -d Electronic... [Pg.205]

It is noteworthy that all these reactions are reversible, but under reducing conditions the equilibrium shifts to the right-hand side, and under oxidizing conditions it shifts to the left-hand side. For all resulting binuclear ions at rather low concentration in solutions, reactions take place, accompanied by the rupture of the M-M bond and the formation of unstable mononuclear complexes, which are readily oxidized even by the solvent. At high concentrations of binuclear ions cycloaddition reactions of multiple M-M bonds (these reactions are considered in section 3.5) occur to form stable, under the given conditions, polynuclear clusters. [Pg.219]


See other pages where Cluster, binuclear is mentioned: [Pg.149]    [Pg.149]    [Pg.415]    [Pg.82]    [Pg.118]    [Pg.120]    [Pg.122]    [Pg.124]    [Pg.146]    [Pg.184]    [Pg.15]    [Pg.15]    [Pg.390]    [Pg.98]    [Pg.65]    [Pg.190]    [Pg.191]    [Pg.298]    [Pg.190]    [Pg.190]    [Pg.190]    [Pg.190]    [Pg.193]    [Pg.193]    [Pg.195]    [Pg.200]    [Pg.201]    [Pg.202]    [Pg.204]    [Pg.206]    [Pg.207]    [Pg.207]    [Pg.210]   
See also in sourсe #XX -- [ Pg.42 ]




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