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The complexes bis(6,6′-dibromo-2,2′-bipyridine-N,N′)copper(I) perchlorate, [Cu(C10H6Br2N2)2]ClO4, and bis(6,6′-dibromo-2,2′-bipyridine-N,N′)silver(I) tetrafluoroborate, [Ag(C10H6Br2N2)2]BF4, both contain four-coordinate pseudo-tetrahedral metal centres, in which the two bidentate chelating ligands are nearly mutually perpendicular: the average dihedral angle between the two MN2 planes is 87.9° for M = Cu but only 75° for M = Ag, which reflects the lesser interligand steric interactions in the silver(I) complex, arising from the greater metal-ligand bond distances. For both complexes, the crystal packing is dominated by intermolecular Br
Br interactions.
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