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M centers

Mittel-ol, n. middle oil medium-heavy oil. -ost, m. Middle East, -produkt, n. middle product intermediate middlings, -punkt, m. center, central point, mittels, prep, by means of,... [Pg.302]

Tragheits-kraft, /. force of inertia, -mittel-punkt, m. center of inertia, -moment, w. moment of inertia,... [Pg.449]

Umdrehung,/. rotation revolution turn, Umdrehungs-achse, /. axis of rotation (or revolution), -bewegung, /. rotatory motion, -geschwindigkeit, /. speed of rotation (or revolution), -punkt, m. center of rotation (or revolution), -richtung, /. direction of rotation (or revolution), -zahl,/. number of revolutions, r.p.m. -zUhler, m. revolution counter. [Pg.462]

In the heterogeneous solid, a different mechanism concerning charge dominates. If there are associated vacancies, a different type of electronic defect, called the "M-center", prevails. In this case, a mechanism similcu to that already given for F-centers operates, except that two (2) electrons occupy neighboring sites in the crystal. The defect equation for formation of the M-center is ... [Pg.95]

The following diagram, given as 3.3.3. on the next page, illustrates the "M-Center ... [Pg.95]

The preparation and structural characterization were successful for the complexes (L)Au(C=C)3, with L = PMe3 or Me2PhPCH2 and R = Ph. The two compounds are colorless and diamagnetic, and have the expected square-planar configuration of the gold(m) center.120... [Pg.266]

Sulfonium and oxosulfonium ylides or mixed phosphonium/sulfonium ylides are equally potent cr-donors for gold(i) and gold(m) centers (Scheme 32)<1 2 166 i68... [Pg.273]

Oxidative addition of dihalomethanes CH2X2 to cyclic gold(i) ylide compounds yields bicyclic compounds with a methylene bridge between two gold(m) centers.2 The two halogens can also be replaced by diphenyl-dithiophosphinate groups to give products which are kinetically stable toward reductive elimination (Equation (38)).191... [Pg.279]

It should be noted that the preparation of complexes (RNC)AuCN can be carried out via very special routes. Thus AuCN reacts with Mel to give (MeNC)AuCN. This reaction involves an interesting A-alkylation of an Au(i)-bound cyanide group.219 Other (RNG)AuGN complexes were obtained from the reaction of K[AuC14] with the isocyanide in methanol. Examples are the compounds (L)Au2(CN)2 with L = l,8-diisocyano-/>-menthane or 2,5-diisocyano-2,5-dimethyl-hexane. The reactions proceed with a dealkylation of an isocyanide in the coordination sphere of a gold(m) center to produce free cyanide (Scheme 53).201... [Pg.284]

Heterocyclic carbenes have been applied as ligands to gold(i) and gold(m) with a wide variety of heteroatoms and substitution patterns.256,257 Gold(i) forms 1 1 and 1 2 complexes with a linear coordination geometry, while at gold(m) centers, carbenes appear only in combination with other ligands in a square-planar array. [Pg.289]

Enzyme State Experimental Technique Fe-S (A) Short M Center Short P Cluster Cross- Cluster Fe-Mo (A)... [Pg.72]

See other pages where M centers is mentioned: [Pg.169]    [Pg.434]    [Pg.422]    [Pg.1919]    [Pg.107]    [Pg.257]    [Pg.290]    [Pg.403]    [Pg.1297]    [Pg.179]    [Pg.14]    [Pg.95]    [Pg.96]    [Pg.70]    [Pg.54]    [Pg.219]    [Pg.166]    [Pg.664]    [Pg.257]    [Pg.57]    [Pg.241]    [Pg.241]    [Pg.242]    [Pg.242]    [Pg.243]    [Pg.266]    [Pg.269]    [Pg.270]    [Pg.274]    [Pg.278]    [Pg.24]    [Pg.71]    [Pg.72]    [Pg.73]    [Pg.93]    [Pg.119]    [Pg.120]    [Pg.120]    [Pg.234]   
See also in sourсe #XX -- [ Pg.95 ]

See also in sourсe #XX -- [ Pg.93 ]

See also in sourсe #XX -- [ Pg.54 ]

See also in sourсe #XX -- [ Pg.199 ]



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Details of the M Center

M ))e ) Centers

Other Complexes Possibly Containing M—H—Si Three-Center Bonds

Oxidative addition at M center

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