Figure 2From: A mechanophysical phase transition provides a dramatic example of colour polymorphism: the tribochromism of a substituted tri(methylene)tetrahydrofuran-2-one Folded (a, c and e) and twisted (b and d) conformations viewed along perpendicular directions (left and right): a) I; b) II; c) IIIa; d) IIIb; e) IV. Back to article page