A novel polyoxomolybdate (C 14 H 16 N 2) 3 (C 14 H 17 N 2) 2 [β-Mo 8 O 26 ](1) has been synthesized from hydrothermal reaction of tolidine and molybdenum trioxide in water and characterized by its IR and UV spectra, 1 H NMR, cyclic voltammetry and single crystal X-ray diffraction. Compound 1 crystallizes in the triclinic crystal system, space group Pī, with the crystal cell parameters of a=11.5360 Å, b=11.6080 Å, c=15.2520 Å, α=72.50 • , β=79.46 • , γ =86.91 • , V =1915.00 Å 3 and Z=1. The asymmetric unit of the crystal structure of (C 14 H 16 N 2) 3 (C 14 H 17 N 2) 2 [β-Mo 8 O 26 ] contains β-octamolybdate [β-Mo 8 O 26 ] 4− anions, two tolidine molecules and shows the presence of monoprotonated tolidine cations. One tolidine molecule and a β-Mo 8 O 26 polyanions species lie across crystallographic inversion centres while the two tolidine molecules occupy general sites.

In the title compound, C16H12Cl2O2, the dichloro­phenyl and methoxy­phenyl groups are linked by a prop-2-en-1-one group. The C=C double bond is trans configured. The mol­ecule is not planar, as can be seen from the dihedral angle of 6.21 (7)° between the planes of the two rings. The crystal structure can be described by two types of crossed layers which are parallel to (110) and (10).

The title compound, [Cu(C11H11N4O2)2], was prepared by solvothermal synthesis using 2-amino-5-(4-methoxy­phen­yl)-1,3,4-oxadiazole and copper sulfate penta­hydrate in an acetonitrile solution. The CuII 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 mol­ecule and the nitrile C atom of the solvent. In the crystal structure an inter­molecular N—H⋯N hydrogen bond links inversion-related mol­ecules.

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