The first Mn–Zn heterometallic dinuclear compound based on Schiff base ligand N, N′-bis(salicylidene)-1,3-diaminopropane

One new heterometallic dinuclear Schiff-base complex Mn(DMF)2Zn(salpn)Cl2 (1) (H2salpn = N,N′-bis(salicylidene)-1,3-diaminopropane) has been successfully constructed by the solvothermal reaction of Mn(ClO4)2, ZnCl2 and H2salpn, and characterized by element analysis, IR spectroscopy and thermal analysis, as well as single crystal X-ray diffraction. The result reveals that compound 1 is heterodinuclear with Mn2+ and Zn2+ centers, in which they respectively present octahedral and tetrahedral coordination geometries. Each neutral molecule unit [Mn(DMF)2Zn(salpn)Cl2] is further connected by four intermolecular hydrogen bonding CH⋅⋅⋅Cl and two CH⋅⋅⋅O interactions from six adjacent units to form a three-dimensional supramolecular network with pcu α-Po 412⋅ 63 topology. Moreover, luminescence, antifungal and antimicrobial activities of the heteronuclear compound 1 have also been investigated.

A three-dimensional supramolecular network with pcu α-Po 412⋅ 63 topology assembled from neutral molecule unit [Mn(DMF)2Zn(salpn)Cl2] (1) by four intermolecular hydrogen bonding CH⋅⋅⋅Cl and two CH⋅⋅⋅O interactions, in which complex 1 denotes the first example of the hetero-dinuclear Mn–Zn compound containing H2salpn ligand.Figure optionsDownload as PowerPoint slideResearch Highlights
► The first heterometallic dinuclear complex [MnZn(salpn)Cl2] was constructed from alone Schiff base ligand H2salpn, which was assembled into 3D supramolecular network with 6-connected pcu α-Po type 412·63 topology.
► Though many mononuclear, dinuclear and trinuclear Zn2+/Mn2+ complexes as well as 1D Zn2+/Mn2+ polymers derived from the Schiff base ligand N, N′-bis(salicylidene)-1,3-propanediamine, with the various anions or solvent molecules acted as the bridging or terminal groups have been widely investigated at recent years, its heterometallic dinuclear Mn-Zn complexes are not reported so far.
► To the best of our knowledge, the compounds Mn(DMF)2Zn(salpn)Cl2 (1) (H2salpn = N,N′-bis(salicylidene)-1,3-diaminopropane) is the first example of the hetero-dinuclear Mn-Zn compound containing H2salpn ligand.