Unique tetranuclear heterometallic compound [Na2Zn2{(4-py)C(H)(NOH)}2(CH3COO)6(H2O)4].2H2O with luminescent properties

The luminescent heterometallic material, [Na2Zn2{(4-py)C(H)NOH}2(CH3COO)6(H2O)4].2H2O (1), where (4-py)C(H)NOH = pyridine-4-carbaldehyde oxime, was synthesized and characterized by single crystal X-ray method. In the centrosymmetric tetranuclear molecule each sodium site is bound to six oxygen atoms, the donor atoms come from three acetate anions and three water molecules, two of which act as μ2-aqua bridges between Na(I) centers. Each zinc site is bound to three oxygen atoms from the same acetate anions and one nitrogen atom from the capped (4-py)C(H)NOH molecule which coordinates via pyridine nitrogen. The bridging acetate ligands show two coordination modes within one compound.