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In the structures of N,N'-methylenedipyridinium cis-difluorotetrachloroosmate(IV), (I), and N,N'-methylenedipyridinium trans-difluorotetrachloroosmate(IV), (II), cis- and trans-[(C5H5N)2CH2][OsCl4F2], the trans influence in the F-Os-Cl axes of (I) lengthens the average Os-F distance to 1.948 Å and shortens the average Os-Cl distance to 2.316 Å, compared with those of the symmetrically coordinated axes F-Os-F in (II) and Cl-Os-Cl in (I) and (II), respectively, with mean values of 1.926 and 2.337 Å observed for Os-F and Os-Cl, respectively.

Supporting information


Crystallographic Information File (CIF)
Contains datablocks I, II, global


Structure factor file (CIF format)
Contains datablock I


Structure factor file (CIF format)
Contains datablock tosf2

CCDC references: 126302; 126303

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