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Figure 3
Fit by least squares of the atoms of molecule 1 of the low-temperature phase to the equivalent atoms of the room-temperature phase. All non-H atoms of the calix[4]pyrrole molecule were included in the fit. The columns of the monoclinic phase are shown in ball-and-stick and in wireframe form. The offset of the triclinic form, which is displayed as dashed lines, results primarily from a shift along the a axis. |