Metal-organic frameworks showing successive magnetic ordering are far less common than inorganic compounds. Here, we report two metal-organic frameworks [Co^II(ox)(bphy)·0.1(DMF)·0.1(MeOH)]_n(1) and [Co^II₃(ox)₃(bphy)₂(DMF)₂]_n(2) comprised of zigzag and necklace Co^II-ladders, respectively. Together with a previously reported compound [Co^II(ox)(bphy)·0.2 (DMF)]_n(3) consisting of spiraling zigzag Co^II-ladders, these three compounds provide a good system for comparative structural and magnetic studies. Comprehensive magnetic analysis reveals that the three compounds undergo long-range magnetic ordering at ∼2.6 K but exhibit vastly different short-range magnetic correlations: compound 1 shows short-range spin-canted antiferromagnetism ordering at ∼14.0 K; compound 2 demonstrates successive short-range antiferromagnetism ordering at ∼15.5 and ∼12.6 K; compound 3 shows slow magnetic relaxation with T_b≈4.6 K. These results demonstrate long-range magnetic ordering is readily accessible in the frameworks of ox²⁻ bridging Co^II-ladders linked by bphy, where short-range magnetic correlations can be systematicly tuned by the Co^II-ladder structures.

显示出连续磁有序的金属-有机骨架比无机化合物普遍得多。在这里，我们报告两个金属有机框架[Co ^II（ox）（bphy）·0.1（DMF）·0.1（MeOH）] _n（1）和[Co ^II ₃（ox）₃（bphy）₂（DMF）₂ ] _ñ（2）由Z字形和项链的Co ^II -ladders，分别。与先前报道的由螺旋曲折形Co ^II组成的化合物[Co ^II（ox）（bphy）·0.2（DMF）] _n（3）梯子，这三种化合物为比较结构和磁性研究提供了一个很好的系统。全面的磁性分析表明，这三种化合物在〜2.6 K处经历了远距离磁有序，但表现出极大的短程磁相关性：化合物1在〜14.0 K处表现出短程自旋倾斜反铁磁性。化合物2证明连续的短程反铁磁性在〜15.5和〜12.6 K处有序。化合物3个与显示缓慢磁弛豫Ť _b ≈4.6K.这些结果证明长程磁有序是在牛的框架容易获得^2-桥接钴^II通过bphy链接的梯子，其中短距离磁相关性可以通过Co ^II梯子结构进行系统地调节。