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![[Figure 4]](su3065fig4mag.jpg)
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Figure 4
Difference Fourier maps for the structure of (I) ![[link]](../../../../../../logos/arrows/c_arr.gif) , showing (a) the environment of the 4,4′-bipyridinium cation and (b) the environment of the hydrogen oxalate anion, indicate that the H atoms attached to the N1 and O1 atoms could be located and they were refined freely. |
![[Figure 4]](su3065fig4.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
