Solvatochromic property switching of a naphthoquinone pigment: 2-methyl-3-arylthio-1,4-naphthalenedione

Photo-and thermoresponsive N-salicylideneaniline derivatives: solid-state studies and structural aspects

Eight photo-and/or thermoresponsive salicylideneanilines were obtained by mechanosynthesis under solvent-free conditions and stabilized by external stimuli for their isolations in solid-state. Switching properties of these materials were investigated by various analytical techniques and spectroscopic data.

Reversible on/off switching of photochromic properties in N-salicylideneaniline co-crystals by heating and humidification

The photochromic properties of N-salicylideneaniline (SA) derivative co-crystals were switched on/off through the hydration–dehydration phase transition induced by humidification and heating.

Inhibition of Polymorphic Property of Naphthoquinonepigment Derived from Vitamin K

Organicpigment, 2-Methyl-3-(4-fluorophenylthio)-1,4-naphthalenedione (2), that is a new Vitamin K derivative bearing a fluorine group, did not show any polymorphism disregard of three different solvents. For comparison, its naphthoquinone analogue with a bromine group (1) showed clearly polymorphism susceptible to these solvents.