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Open bridge

Namely, the adsorbents of such type are polycrystalline materials with dominant type of intracrystalline contacts in the shape of open bridges enriched in superstoichiometric metal, which is the principal electron donor. Adsorption of oxygen resulting in binding of superstoichiometric metal atoms leads to the change in concentration of free electrons in bridges which results in the change of electric conductivity of the whole adsorbent. [Pg.123]

Reactions that break open bridged molecules preserve stereochemistry... [Pg.863]

In higher boranes, in addition to the bridges BHB, there are also two types of fragments with three-centre bonds the open bridge B and the closed , or... [Pg.99]

N20rchelates (737), (733) with an open bridge were prepared by reaction of bifunctional o-hydroxyaldehyde derivatives (730), (732) with metal salts in DMF or ethanol (Eq. 66, 67) >297,298)... [Pg.125]

Au2Cl2(/t-dppl) CHCls Molecule I open bridge antiperiplanar 180... [Pg.20]

AuCl(/i-dppf)] CH2Cl2 [AuCl(/r-dppf)]/ open bridge open bridge anticlinal (eclipsed) 153.1... [Pg.20]

Fe(CO)j2(/ -dppf open bridge anticlinal (eclipsed) antiperiplanar 162.8... [Pg.22]

Re2(CO)9)2(p-dppf) solvate open bridge anticlinal (eclipsed) 131.3... [Pg.22]

In contrast to the unidentate and open-bridging dppf complexes, the chelates generally exhibit a greater extent of ring tilting but minimal divergence of the phosphorus atoms. Mean values of 6 of known chelates 4.1° 0.05 A, com-... [Pg.33]

In the open-bridging complexes, the more obvious distortion lies in the displacement of phosphorus donors from coplanarity with the Cp rings. To maintain an ideal centrosymmetry, the two C (Cp)-P vectors tend to diverge oppositely and equally away from the iron center. That this effect is coordination-induced is supported by... [Pg.34]

Yet monosubstitution at C (11) does not suffice and the product is the open bridged annulene, e.g. 27. Its preparation illustrates many other cases in which [4.4.1]propellane intermediates are formed and exist as propellanes at lower oxidation states (cf. 26). But once the tetraenic one is arrived at, the product more often than not prefers to exist as the more stable aromatic bridged annulene. [Pg.1200]

See other pages where Open bridge is mentioned: [Pg.183]    [Pg.110]    [Pg.25]    [Pg.206]    [Pg.50]    [Pg.236]    [Pg.18]    [Pg.19]    [Pg.20]    [Pg.20]    [Pg.20]    [Pg.22]    [Pg.22]    [Pg.22]    [Pg.22]    [Pg.22]    [Pg.27]    [Pg.27]    [Pg.30]    [Pg.33]    [Pg.33]    [Pg.92]    [Pg.92]    [Pg.18]    [Pg.19]    [Pg.20]    [Pg.20]    [Pg.20]    [Pg.22]    [Pg.22]    [Pg.22]   
See also in sourсe #XX -- [ Pg.18 , Pg.27 ]

See also in sourсe #XX -- [ Pg.18 , Pg.27 ]



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