Acta Cryst. (2007). E63, m2336 [ doi:10.1107/S1600536807039347 ]
Abstract: The asymmetric unit of the title salt, (C4H6N3)2[Cr2O7], consists of two 2-aminopyrimidinium cations and one dichromate dianion linked together by N-HO hydrogen bonds to form a ribbon structure lying parallel to the (013) plane and running along the a axis. Pairs of symmetry-related cations are connected into centrosymmetric dimers via N-HN hydrogen bonds, forming eight-membered R22(8) rings.
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