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Figure 2
A difference Fourier map of the electron density associated with the N—H⋯O inter­action between the isonicotinamidium cation and the squarate dianion. The diffuse nature of the electron density is clear, with the largest concentration of electron density located closer to the N than to the O atom.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 61| Part 12| November 2005| Pages o678-o680
doi:10.1107/S0108270105032622
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