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Dianionic binding mode

Substrate binding mode Didentate dianionic Didentate monoanionic... [Pg.299]

When two binding subunits are located at the poles of a coreceptor molecule, the complexation of a difunctional substrate will depend on the complementarity between the distance of the two binding sites in the receptor and the distance of the two corresponding functional groups of the substrate. Such linear recognition by ditopic coreceptors has been achieved for both dicationic and dianionic substrates, diammonium and dicarboxylate ions respectively, and corresponds to the binding modes schematically represented by (17) and (18). [Pg.178]

As in the above case of the binding of diammonium substrates to the macrotricyclic coreceptors, the present chain length selection also describes a linear recognition process based on structural complementarity between the dianionic substrates and the coreceptors in a ditopic binding mode (see (28)). In both cases, the receptor molecule acts as a discriminating sensor of molecular length. [Pg.180]

The sulfate ion (S04 ), though a simple dianionic ligand, exhibits a rather flexible symmetry and variable mode of binding with metal ions in the crystalline state. Interest in metal sulfate interactions with the hydra-zinium cation arises from the fact that these compounds exhibit one- and three-dimensional magnetic interactions of a linear-chain antiferromag-net. Dihydrazinium sulfate forms a series of double sulfates with divalent and trivalent cation that are well crystallized and, in a few instances, are even less soluble than hydrazinium sulfate itself. The most easily prepared double sulfates are those of Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Li, Mg, Al, La, Ce, Pr, Nd, and Sm. These salts are similar to the ammonium alums obtained with some metal sulfates. In contrast to the ammonium double salts, the hydrazinium metal sulfates of first row transition elements and lithium crystallize without water, whereas the lighter lanthanides and aluminum form hydrated salts. [Pg.172]


See other pages where Dianionic binding mode is mentioned: [Pg.57]    [Pg.57]    [Pg.567]    [Pg.369]    [Pg.41]    [Pg.204]    [Pg.340]    [Pg.345]    [Pg.245]    [Pg.652]    [Pg.2311]    [Pg.31]    [Pg.1015]    [Pg.49]    [Pg.813]    [Pg.567]    [Pg.458]    [Pg.19]    [Pg.394]    [Pg.151]    [Pg.306]    [Pg.74]    [Pg.163]    [Pg.232]    [Pg.156]    [Pg.2341]    [Pg.2340]    [Pg.232]    [Pg.3686]    [Pg.124]   
See also in sourсe #XX -- [ Pg.57 ]




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Binding modes

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