Fig. 2: Structural and colour changes under temperature and pressure.
From: Putting the squeeze on valence tautomerism in cobalt-dioxolene complexes
a Plot of the relative change in unit cell dimensions of [Me2tpa] (circles) and [Me3tpa] (squares) at variable temperature and pressure. b Plot of the Co–O/N (shades of blue), and C–O bond lengths (shades of orange) in [Me2tpa] (circles) and [Me3tpa] (squares) for each symmetry-independent molecule, A (light shades) and B (dark shades). Black horizontal lines represent the expected values of the Co–O/N and C–O bond lengths for the HS-CoII-SQ tautomer and the red horizontal lines represent the expected values for the LS-CoIII-Cat tautomer. c Photographs of [Me2tpa] (upper) and [Me3tpa] (lower) single crystals during compression in a modified Merrill-Bassett diamond anvil cell, showing a change in colour from green HS-CoII-SQ to red LS-CoIII-Cat.
