title: A {Co4 O4 } Cubane Incorporated within a Polyoxoniobate Cluster.
abstract: A novel octacobalt-containing polyoxoniobate, Na6 K12 [H2 Co8 O4 (Nb6 O19 )4 ]⋅39 H2 O, has been prepared by a combination of hydrothermal and diffusion methods. The polyanion [H2 Co8 O4 (Nb6 O19 )4 ](18-) incorporates a tetrameric assembly of Lindqvist-type [Nb6 O19 ](8-) fragments trapping a {Co(II) 4 Co(III) 4 } cluster which comprises a central {Co(III) 4 O4 } cubane core, surrounded by another four Co(II) ions linkers. Furthermore, magnetic measurements show that the compound exhibits antiferromagnetic interactions.
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Liang
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876.
authors.forename: Dongdi
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876.
authors.forename: Pengtao
authors.initials: P
authors.lastname: Ma
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876. niujy@henu.edu.cn.
authors.forename: Jingyang
authors.initials: J
authors.lastname: Niu
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004 (P. R. China), Fax: (+86) 371-23886876. jpwang@henu.edu.cn.
authors.forename: Jingping
authors.initials: J
authors.lastname: Wang
keywords: cubanes; magnetism; mixed-valence; polyoxometalates; transition metals