Structural variation from heterometallic cluster-based 1D chain to heterometallic tetranuclear cluster: Syntheses, structures and magnetic properties

• Two new heterometallic complexes have been synthesized by solvothermal method.
• The stereospecific blockade of the ligands in the synthesis system seems to be the most important synthetic parameter.
• The magnetism studies show that 1 and 2 exhibit ferromagnetic interactions.
• Complex 1 shows slowing down of magnetization and not blocking of magnetization.

Using the solvothermal method, we present the comparative preparation of {[Co3Na(dmaep)3(ehbd)(N3)3]·DMF}n (1) and [Co2Na2(hmbd)4(N3)2(DMF)2] (2), where Hehbd is 3-ethoxy-2-hydroxy-benzaldehyde, Hhmbd is 3-methoxy-2-hydroxy-benzaldehyde, and Hdmaep is 2-dimethylaminomethyl-6-ethoxy-phenol, which was synthesized by an in-situ reaction. Complexes 1 and 2 were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complex 1 is a novel heterometallic cluster-based 1-D chain and 2 is a heterometallic tetranuclear cluster. The {Co3IINa} and {Co2IINa2} cores display dominant ferromagnetic interaction from the nature of the binding modes through μ1,1,1-N3– (end-on, EO).

Two novel cobalt complexes have been prepared. Compound 1 consists of tetranuclear {Co3IINa} units, which further formed a 1-D chain. Compound 2 is heterometallic tetranuclear cluster. Two complexes display dominant ferromagnetic interaction.Figure optionsDownload as PowerPoint slide