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In a recent paper (Couzi  et al.  2018  R. Soc. open sci.   5 , 180058. ( doi:10.1098/rsos.180058 )), we proposed a new phenomenological model to account for the I↔II↔“III” phase sequence in incommensurate  n -alkane/urea inclusion compounds, which represents an alternative interpretation to that proposed in work of Toudic  et al.  In a Comment (Toudic  et al.  2019  R. Soc. open sci.   6 , 182073. ( doi:10.1098/rsos.182073 )), Toudic  et al.  have questioned our assignment of the superspace group of phase II of  n -nonadecane/urea, which they have previously assigned, based on a (3 + 2)-dimensional superspace, as C222 1 (00 γ )(10 δ ). In this Reply, we present new results from a comprehensive synchrotron single-crystal X-ray diffraction study of  n -nonadecane/urea, involving measurements as a detailed function of temperature across the I↔II↔“III” phase transition sequence. Our results demonstrate conclusively that “main reflections” ( h, k, l , 0) with  h+k  odd are observed in phase II of  n -nonadecane/urea (including temperatures in phase II that are just below the transition from phase I to phase II), in full support of our assignment of the (3+1)-dimensional superspace group P2 1 2 1 2 1 (00 γ ) to phase II. As our phenomenological model is based on phase II and phase “III” of this incommensurate material having the   same   (3+1)-dimensional superspace group P2 1 2 1 2 1 (00 γ ), it follows that the new X-ray diffraction results are in full support of our phenomenological model.

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Reply to comment on Couzi <i>et al</i> . (2018): a phenomenological model for structural phase transitions in incommensurate alkane/urea inclusion compounds

Reply to comment on Couzi et al . (2018): a phenomenological model for structural phase transitions in incommensurate alkane/urea inclusion compounds