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Two new Zn(II)-Pr(III) heteronuclear clusters were synthesized by interfacial diffusion, [ZnPr(L)(NO 3 ) 2 (OAc)(CH 3 OH)]·CH 3 CN ( 1 ) and [Zn 4 Pr 2 L 4 (terephthalate) 2 ]·(NO 3 ) 2  ( 2 ) (H 2 L = bis(3-methoxysalicylaldehyde-3-oxopene-1,5-diamine). They have been characterized by elemental analysis, UV-Vis and IR spectroscopy, and single-crystal X-ray diffraction. Structural analysis revealed that  1  has a heterodinuclear structure, with Zn(II) in the inner cavity generated by deprotonated ligands L 2-  and Pr(III) in the larger outer cavity. Cluster  2  is a heterohexanuclear structure, in which the Pr(III) bridges two [ZnL] to form a heterotrinuclear secondary unit [Zn 2 PrL 2 ], and then two terephthalates connect two secondary units to form a heterohexanuclear cluster structure. The solid-state fluorescence properties of clusters and ligand show that there are not only slightly blue-shifted fluorescence peak of ligand, but also characteristic fluorescence peaks of Pr(III) ions in the two clusters: 615 nm ( 3 P 0 → 3 H 6 ) for  1 , 609 nm ( 1 D 2 → 3 H 4 ) and 646 nm ( 3 P 0 → 3 F 2 ) for  2 , respectively. In the two clusters, the difference of ion fluorescence peaks is attributed to the symmetry difference of coordination geometric environment of Pr(III).

journal of coordination chemistry

Synthesis, fluorescence properties and structural characterization of two heteronuclear Zn(II)-Pr(III) clusters with a chain-shaped ether Schiff base ligand