Fig. 5.

GIEs on the O–H···O H bonds between two TPA anions in different phases of 1-d₀ and 1-d₅. a Secondary GIE on the O···O distance (d_O···O) (phase I, light pink; phase II, yellow; phase III, light cyan). Lines are placed to guide the eye. b Primary GIE on the O–H bond length (d_O–H). The measured diffraction data are compared with the calculated values from either the diffraction data or the ¹H NMR data at 293 K, based on the equations and parameters published by Limbach et al⁴³. The error bars in a and b are the estimated standard deviations (esds) calculated rigorously from the full covariance matrix. The esds in the bond lengths output by SHELXL take the errors in the unit-cell dimensions into account. c Local H-bonded configurations of 1-d₀ and 1-d₅ in phase I (413 K) and II (363 K). Only the d_O/N···O values are shown (black for 1-d₀ and blue for 1-d₅)