Temperature dependence of photoluminescence and hydrogen bonding revealed for the first time in a templated borate family: synthesis, structure and properties of a pentaborate [Emmim][B5O6(OH)4]

Structural Characterization and ORR Activity of a Copper Complex Borate and an Unexpected [Ni(atta)(SO4)0.5]+ Borate-Sulfate

Two metal templated borates, [Ni(atta)(SO₄)_0.5]·[B₅O₆(OH)₄] (1) and [Cu(1-MI)₄]·[B₅O₆(OH)₄]₂·1-MI₂ (2), have been synthesized. The structures were determined by single-crystal X-ray diffraction and further characterized by Fourier transform infrared (FTIR), elemental analysis, and powder X-ray diffraction (PXRD). The structure of 1 consists of [B₅O₆(OH)₄]^- clusters and [Ni(atta)(SO₄)_0.5]⁺ complexes, which shows a very rare Ni-O-S bond. 1 and 2 exhibit a hydrogen-bonded network formed by [B₅O₆(OH)₄]^- clusters. Oxygen reduction reaction (ORR) activities of 1 and 2 were explored.