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Figure 3
View of the possible hydrogen bonds, denoted in discontinuous blue and green lines, involving the methyl­ammonium cation in (a) the orthorhombic commensurate phase, (b) the incommensurate phases and (c) the commensurate monoclinic phase. The distances denoted in grey are too large to be considered as hydrogen bonds. In the incommensurate phases, the distances H1N⋯O3d and H1N⋯O3e are in the ranges 2.075–2.133, 2.009–2.132, 1.973–2.113 and 1.988–2.123 Å at 122, 106, 90 and 86 K, respectively (see details in Tables 4 and 5). Symmetry codes: [({\rm d})\ x + {1\over 2}], [-y + {1\over 2}], [-z - {1\over 2}]; [({\rm e})\ x + {1\over 2}], y, [-z - {1\over 2}]; [({\rm f}) -x + {3\over 2}], [-y], [z - {1\over 2}]; [({\rm g})\ x], [-y + {1\over 2}], z; [({\rm h}) -x + {3\over 2}], [y + {1\over 2}], [z + {1\over 2}]; [({\rm i}) -x + {3 \over 2}], [y + {1\over 2}], [-z + {1\over 2}]; [(j) -x + {1\over 2}], [y + {1\over 2}], [-z + {1\over 2}].

IUCrJ
Volume 6| Part 1| January 2019| Pages 105-115
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518015026