Zwitterionic 1-{(E)-[(2-methyl-phen-yl)iminium-yl]meth-yl}naphthalen-2-olate.

The title Schiff base, C18H15NO, crystallizes in its zwitterionic form and an N-H⋯O hydrogen bond closes an S(6) ring. The dihedral angle between the aromatic ring systems is 36.91 (10)°.

Bis{N-[5-(4-methoxy-phen-yl)-1,3,4-oxa-diazol-2-yl]ethanimidamidato}copper(II).

The title compound, [Cu(C(11)H(11)N(4)O(2))(2)], was prepared by solvothermal synthesis using 2-amino-5-(4-methoxy-phen-yl)-1,3,4-oxadiazole and copper sulfate penta-hydrate in an acetonitrile solution. The Cu(II) atom lies on an inversion center and is four-coordinated in a slightly distorted square-planar geometry by four N atoms of the ligands obtained from the formation of a bond between the amine N atom of the oxadiazole mol-ecule and the nitrile C atom of the solvent. In the crystal structure an inter-molecular N-H⋯N hydrogen bond links inversion-related mol-ecules.

(E)-3-(2,6-Dichloro-phen-yl)-1-(4-methoxy-phen-yl)prop-2-en-1-one.

In the title compound, C(16)H(12)Cl(2)O(2), the dichloro-phenyl and methoxy-phenyl groups are linked by a prop-2-en-1-one group. The C=C double bond is trans configured. The mol-ecule is not planar, as can be seen from the dihedral angle of 6.