Abstract
A 3D mixed-valence Co(III)-Co(II) compound [Co9(bta)10(Hbta)2(H2O)10] n ·[22(H2O)] n ( 1 ) (H2bta= N , N -bis(1 H -tetrazole-5-yl)-amine) was hydrothermally synthesized by reaction of Co(NO3)2·6H2O with H2bta·H2O. Compound 1 consists of three kinds of distorted-octahedral [CoII(N4O2)] paramagnetic nodes which are separated by [CoIII(bta)2(Hbta)]2-/[CoIII(bta)3]3- diamagnetic linkers to generate a 3D porous metal-organic framework (MOF) with alternative …Co(III)…Co(II)… array and channels incorporating water molecules. Under an applied magnetic field of 4000 Oe, compound 1 exhibits slow relaxation of magnetization at low temperatures, giving Δ E / k B =30.00 K and t 0=2.0×10-8 s.
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