An inorganic-organic hybrid polyoxotungstogermanate based on [Ln(α-GeW11O39)2] dimer and dimethylammonium: Synthesis, crystal structure and photoluminescence property.

• An inorganic-organic hybrid lanthanide-polyoxotungstogermanate. • A 3D supramolecular network formed by N H···O and C H···O hydrogen bonds between the [Eu(α-GeW 11 O 39) 2 ]13− polyanion and dimethylammonium cations. • Strong Eu3+ characteristic emission with long decay time. A novel inorganic-organic hybrid lanthanide-polyoxotungstogermanate, [NH 2 (CH 3) 2 ] 13 [Eu(α-GeW 11 O 39) 2 ]·8H 2 O (1) is directly prepared using raw material by hydrothermal synthesis method and characterized by single-crystal X-ray diffraction, PXRD, IR, solid-state UV–visible spectra and TG analyses. Compound 1 is constructed from [Eu(α-GeW 11 O 39) 2 ] dimer anions and dimethylammonium cations. It is an unusual example of crystal structure containing {Eu(α-GeW 11 O 39) 2 } dimer and organic ammonium without alkali metal cations. The N H···O and C H···O hydrogen bonds link the [Eu(α-GeW 11 O 39) 2 ]13− cluster units and the dimethylammonium cations to a 3D supramolecular network. Compound 1 exhibits Eu3+ characteristic luminescent property with decay time of 2.342 ms. [Display omitted] [ABSTRACT FROM AUTHOR]