Weak C-H Center Dot Center Dot Center Dot O Hydrogen Bonds In Anisaldehyde, Salicylaldehyde And Cinnamaldehyde

In situ cryocrystallization has been employed to grow single crystals of 4-methoxybenzaldehyde (anisaldehyde), C8H8O2, 2-hydroxybenzaldehyde (salicylaldehyde), C7H6O2, and (2E)-3-phenylprop-2-enal (cinnamaldehyde), C9H8O, all of which are liquids at room temperature. Several weak C-H center dot center dot center dot O interactions of the types C-aryl-H center dot center dot center dot O, C-formyl-H center dot center dot center dot O and Csp(3)-H center dot center dot center dot O are present in these related crystal structures.