Abstract
A novel single vertex-shared dicubane-based cobalt(II) compound, [CoII7(bhqe)3(OH)2(H2O)6]·2C2H5OH·H2O (1), was obtained through the solvothermal generation of 1,2-bis(8-hydroxyquinolin-2-yl)ethane-1,2-diol, H4bhqe, from 2-(hydroxymethyl)quinolin-8-ol, H2hmq, by in situ C−C coupling reaction in ethanol containing Co(NO3)2·6H2O and triethylamine. The crystal structure consists of dicubane Co7 cores with six ligands wrapped around it in a trefoil through strong intramolecular π−π interactions and features an unusual one-dimensional hydrogen-bonded (OHwater···Obhqe) supramolecular organization (along the c-axis). The key factor of the cluster is that every pair of cobalt atoms are bridged by a single oxygen atoms making an average angle of approximately 95° and is expected theoretically and experimentally to generate ferromagnetic coupling. The temperature dependence magnetization exhibits a blocking temperature at approximately 3 K which is confirmed by observation of large frequency dependence of the ac-su...
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