Fig. 3. XRD patterns (a) and DSC curves (b) of p-P₄Ac, p-P₄A and p-FP₂A. p-P₄Ac-P, powder of p-P₄Ac; p-P₄Ac-SC, single crystal of p-P₄Ac; p-P₄A-P, powder of p-P₄A; p-P₄A-SC, single crystal of p-P₄A; p-FP₂A-P, powder of p-FP₂A; p-FP₂A-SC, and single crystal of p-FP₂A.