Incorporating [GaB4O11(OH)]8− clusters to construct luminescent galloborate with open-framework layers†
Abstract
A hydrothermal reaction of NH4B5O8·4H2O, BaCO3 and ethylenediamine leads to a new borate, Ba2B10O16(OH)2·(H3BO3)(H2O) (1). Compound 1 crystallizes in the triclinic space group P. Its structure features a 2D layered-structure constructed by B5O10(OH) clusters. With the further addition of Ga2O3 into the reaction system, a new galloborate, BaGa(B4O8)(OH)·(H2O) (2) was obtained. Compound 2 crystallizes in the triclinic space group P. Its structure displays rare 5-connected open-framework layers constructed by GaB4O11(OH) units, which show nine membered ring (9-MR) channels within the layers and smaller 6-MR transport-limiting openings perpendicular to the layers. The trigonal bipyramidal GaO5 played a critical role in the formation of compound 2. Interestingly, compound 2 displays blue luminescence.