A new 2-D layer-like organic-inorganic hybrid tungstobismuthate constructed from [Bi2W20O70]14− units and dimeric [Cu2(dien)2]24+ complex cations.

Abstract The reaction of the lacunary polyoxotungstate [ B - α -BiW 9 O 33 ]9− with Cu(Ac) 2 ·H 2 O in the presence of diethylenetriamine under hydrothermal conditions generating a new 2-D layer-like organic-inorganic hybrid tungstobismuthate [Cu(dien)(H 2 O)] 2 [Cu 2 (dien) 2 ] 2 H 2 [Bi 2 W 20 O 70 ]·15H 2 O (1) (dien = diethylenetriamine). 1 has been carefully characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), X-ray single-crystal diffraction. 1 crystallizes in the orthorhombic Pbca space group with a = 21.077(2) Å, b = 21.788(2) Å, c = 22.821(2) Å, V = 10480.1(17) Å3, Z = 4, GOOF = 1.043, R 1 = 0.0454, wR 2 = 0.0710. Structural analyses show that 1 exhibits an organic-inorganic hybrid 2-D layer-like architecture constructed by [Bi 2 W 20 O 70 ]14− polyanions by means of the [Cu 2 (dien) 2 ]4+ bridges. Notably, the dien ligand presents two kinds of coordination modes in 1 , which has been rarely observed in previously reported polyoxometalates. The magnetic study of 1 demonstrates the existence of ferromagnetic coupling interactions between Cu2+ ions in dimeric [Cu 2 (dien) 2 ]4+ groups. Graphical abstract A new 2-D layer-like organic-inorganic hybrid tungstobismuthate constructed by [Bi 2 W 20 O 70 ]14− units and [Cu 2 (dien) 2 ]4+ cations has been synthesized and characterized. Image 1 Highlights • Organic-inorganic hybrid POM was synthesized and characterized. • We have analyzed the crystal structure of POM by IR, TGA and XRD. • This structure displays a grid-like 2-D (4,4)-network topology. • 2-D framework built by [Bi 2 W 20 O 70 ]14− polyanions and [Cu 2 (dien) 2 ]4+ bridges. • Evident ferromagnetic interactions resided in dimeric [Cu 2 (dien) 2 ]4+ groups. [ABSTRACT FROM AUTHOR]