1‐Methyl­indole‐3‐carbox­aldehyde oxime derivatives

1‐Methyl­indole‐3‐carbox­aldehyde oxime, C10H10N2O, (I),and (E)‐5‐methoxy‐1‐methyl­indole‐3‐carbox­aldehyde oxime, C11H12N2O2, (II), were ex­amined structurally to ascertain the geometry of the hydroxy­imino function relative to the indole core. Oxime (I) exhibits cis geometry and there are two mol­ecules in the asymmetric unit. In contrast, oxime (II) exhibits trans geometry and has four mol­ecules in the asymmetric unit, with the geometry of the 5‐methoxy group in one mol­ecule differing from that in the other three. Both crystal structures are maintained by hydrogen bonding with no π‐stacking of the indole moiety present.