Reaction of the metalloligand Ir^III(ppy-COOH)₃ and the anisotropic paramagnetic Co^II ion under solvothermal conditions resulted in a metal–metalloligand coordination polymer, [Co^II₃(μ₃-O)(μ-OH₂){Ir^III(ppy-COO)₂(ppy-COOH)}₂(H₂O)₄]·2DMF·xH₂O (I). It consists of trimeric Co₃O secondary building units (SBUs) bridged by pairs of Ir to form chains of alternate orthogonal squares. The compound undergoes two single-crystal to single-crystal transformations while retaining its general structural features. A chemical transformation occurs to give [Co^II₃(μ₃-O){Ir^III(ppy-COO)₂(ppy-COOH)}₂(H₂O)₄(DMF)]·DMF·H₂O (II) by soaking in acetone, where a bridging water molecule departs and the solvent DMF bonds to the vacant site of the Co center. Both I and II undergo a temperature-induced transformation to [Co^II₃(μ₃-O){Ir^III(ppy-COO)₂(ppy-COOH)}₂(H₂O)₃(DMF)]·DMF (III), where one more coordinated water molecule is lost. The major difference in the three phases is in the Co coordination spheres, which have considerable consequences on the magnetism. Compound I displays paramagnetism down to 2 K, whereas II and III show weak ferromagnetism with T_C values of 14 and 17 K, respectively.

中文翻译：

---

嵌入三角形钴氧簇的金属-金属配位体配位聚合物：溶剂和温度诱导的晶体到晶体的转变和相关的磁性。

所述metalloligand铱的反应^III（PPY-COOH）₃和各向异性顺磁性钴^II溶剂热的条件下离子导致金属metalloligand配位聚合物，[CO ^II ₃（μ ₃ -O）（μ-OH ₂）{铱^III（ppy-COO）₂（ppy-COOH）} ₂（H ₂ O）₄ ]·2DMF· x H ₂ O（I）。它由三聚体Co _3组成由一对Ir桥接的O个二级建筑单元（SBU），形成交替的正交正方形链。该化合物经历了两个单晶至单晶转变，同时保留了其一般结构特征。时，发生化学转化，得到[CO ^II ₃（μ ₃ -O）{铱^III（PPY-COO）₂（PPY-COOH）} ₂（H ₂ O）₄（DMF）]·DMF·H ₂ O（II）浸泡在丙酮中，其中桥连的水分子离开，而溶剂DMF结合到Co中心的空位。无论我和II经受温度诱导转化为[有限公司^II₃（μ ₃ -O）{铱^III（PPY-COO）₂（PPY-COOH）} ₂（H ₂ O）₃（DMF）]·DMF（III），其中，一个更加协调的水分子被丢失。三相的主要区别在于Co配位领域，这对磁性有很大影响。化合物I显示低至2 K的顺磁性，而化合物II和III显示T _C分别为14 K和17 K的弱铁磁性。