Copper and manganese complexes based on bis(tetrazole) ligands bearing flexible spacers: Syntheses, crystal structures, and magnetic properties

Five new Cu(II)/Mn(II) complexes Cu2(HL1)2(H2O)2 (1), [Mn2(HL1)2(H2O)4]·2H2O (2), {[Cu5(HL2)2(SO4)2(OH)2(H2O)2]·5H2O}n (3), [Cu(HL2)]n (4), Cu3(L3)2(OH)2(H2O)2 (5) based on three flexible ligands [bis-(1H-tetrazol-5-ylmethyl)-amine (H3L1), bis-(1H-tetrazol-5-ylethyl)-amine (H3L2) and 1,5-bis(5-tetrazolo)-3-thiapentane (H2L3)] have been synthesized and structurally characterized, which are in the wide range of 0-D to infinite 2-D network. The dinuclear complexes 1 and 2 can be further assembled into 3-D supramolecular frameworks via hydrogen-bonding interactions, respectively, resulting in a topological pcu and bcu-x net with the Schlafli symbol {412·63} and {336·448·57}. Complexes 3 and 4 feature an infinite 1-D chain and 2-D network, respectively. Both the 2-D framework of 4 and 2-D supramolecular network of 5 can be simplified into a four-connected {44·62} topological sql network. In addition, the magnetism studies indicate antiferromagnetically coupled systems exist in 1–5.

Graphical abstractFive copper and manganese coordination compounds with bis(tetrazole) ligands were synthesized and structurally characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction. All the complexes are air stable at room temperature. Furthermore, the magnetic properties of complexes 1–5 have been investigated and discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide