Azide-Bridged One-Dimensional MnIII Polymers: Effects of Side Group of Schiff Base Ligands on Structure and Magnetism
- 22 November 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 46 (26), 11235-11242
- https://doi.org/10.1021/ic701655w
Abstract
By changing ancillary tetradentate Schiff base ligands (L), two new one-dimensional azide-bridged manganese(III) coordination complexes [MnIII(L)(μ1,3-N3)]n [L = 5-Fsalen (1), 5-OCH3 (2); salen = N,N‘-bis(salicylidene)-1,2-diaminoethane] as well as a mononuclear complex [MnIII(salophen)(N3)] (3) [salophen = N,N‘-bis(salicylidene)-o-phenylenediamine] have been successfully obtained. All of them have been structurally and magnetically characterized. In the structures of 1 − 3 each MnIII ion is in a distorted octahedral geometry with an obvious Jahn−Teller effect, where the tetradentate L ligands all bind in the equatorial mode, whereas in the axial direction, the N3- ion acts as an end-to-end bridge in 1 and 2 while a terminal group in 3 with a methanol molecule at the other end. Magnetic characterization shows that the μ1,3-bridging azide ion proves to mainly transmit antiferromagnetic interaction between MnIII ions, but these three complexes exhibit various magnetic behaviors at low temperatures. Noteworthily, complex 2 behaves as a weak ferromagnet with a relatively large coercive field of 2.3 kOe, much larger than the value reported previously.Keywords
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