3D supramolecular open-framework constructed by inorganic [B5O6(OH)4]− and organic [CH3COO]− anions

•It is the first example of 3D supramolecularopen-framework consisting of both inorganic borate polyanion and organic acid anion

A borate compound [Ni(en)3][B5O6(OH)4][CH3COO] (1) has been synthesized under mild hydrothermal conditions. The newly synthesized compound was characterized by single-crystal X-ray diffraction, elemental analysis and thermogravimetry. The three-dimensional (3D) supramolecular open-framework of compound 1 is constructed by inorganic [B5O6(OH)4]− building units and organic [CH3COO]− anions through hydrogen bonds, and the charge-balancing [Ni(en)3]2 + cations are located in 3D channels. It is very interesting that there exist two helical chains formed by [B5O6(OH)4]− building units and organic [CH3COO]− anions through hydrogen bonds in compound 1 along different axes. Magnetic measurement indicates that compound 1 exhibits paramagnetic behavior down to 4 K.

Graphical abstractThe inorganic [B5O6(OH)4]− and organic [CH3COO]− anions co-constructed 3D supramolecular open-framework which exist two helical chains through hydrogen bonds in the compound along different axes.Figure optionsDownload full-size imageDownload as PowerPoint slide