Imprinting Chemical and Responsive Micropatterns into Metal–Organic Frameworks

Stamp of approval : Wet stamping allows metal???organic framework (MOF) crystals to be imprinted with micropatterns of various organic chemicals. Printing the MOFs with photochromic molecules and pH indicators generates stimuli???responsive micropatterns which change their appearance upon contact with specific chemicals (see picture), thus reporting the environmental ???status??? of the crystal.