Incorporation of Three Kinds of Borate Anionic Groups in One Single Copper Oxyborate Including the Unprecedented Branched Anionic (B3O7)5- Group

Our original intention research of new low-dimensional magnetic structures afforded a novel copper oxyborate with unexpected CuO based layer structure, namely, PbCu6B6O16. Moreover, it contains a novel FFB composing of isolated (BO3)3−, (B2O5)4- and unprecedented (B3O7)5- borate anionic groups. (B2O5)4- and (B3O7)5- are branched borate units only formed by corner-sharing of BO3 triangles.