6-Chloro­isocytosine and 5-bromo-6-methyl­isocytosine: again, one or two tautomers present in the same crystal?

Gerhardt, V.; Bolte, M.

doi:10.1107/S2053229615024080

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 14
A partial packing diagram for (IV)

, representing the synthon sequence 3u–2i_N·N–3u of the tetrameric arrangement. Only H atoms which participate in hydrogen bonds are shown. Dashed lines indicate hydrogen bonds. The atom names are completed by added the letter A or B in the centre of the ring to which the atoms are attached. [Symmetry codes: (i) −x + $[{1\over 2}]$ , y − $[{1\over 2}]$ , −z + $[{1\over 2}]$ ; (ii) x − $[{1\over 2}]$ , −y + $[{1\over 2}]$ , z − $[{1\over 2}]$ ; (iii) −x + 2, −y + 1, −z + 1.]

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 72| Part 1| January 2016| Pages 84-93

doi:10.1107/S2053229615024080

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