Hydrothermal synthesis and structural characterization of an organic–inorganic hybrid sandwich-type tungstoantimonate [Cu(en)2(H2O)]4[Cu(en)2(H2O)2][Cu2Na4(α-SbW9O33)2]·6H2O

•Organic–inorganic hybrid sandwich-type tungstoantimonate.•{Cu2Na4 sandwiched} tungstoantimonate [Cu2Na4(α-SbW9O33)2]10−.•Ferromagnetic tungstoantimonate.

An organic–inorganic hybrid sandwich-type tungstoantimonate [Cu(en)2(H2O)]4[Cu(en)2(H2O)2][Cu2Na4(α-SbW9O33)2]·6H2O (1) has been synthesized by reaction of Sb2O3, Na2WO4·2H2O, CuCl2·2H2O with en (en=ethanediamine) under hydrothermal conditions and structurally characterized by elemental analysis, inductively coupled plasma atomic emission spectrometry, IR spectrum and single-crystal X-ray diffraction. 1 displays a centric dimeric structure formed by two equivalent trivacant Keggin [α-SbW9O33]9− subunits sandwiching a hexagonal {Cu2Na4} cluster. Moreover, those related hexagonal hexa-metal cluster sandwiched tungstoantimonates have been also summarized and compared. The variable-temperature magnetic measurements of 1 exhibit the weak ferromagnetic exchange interactions within the hexagonal {Cu2Na4} cluster mediated by the oxygen bridges.

Graphical abstractAn organic–inorganic hybrid {Cu2Na4} sandwiched tungstoantimonate [Cu(en)2(H2O)]4[Cu (en)2(H2O)2][Cu2Na4(α-SbW9O33)2]·6H2O was synthesized and magnetic properties was investigated. Figure optionsDownload full-size imageDownload as PowerPoint slide