Boronic acid flux synthesis and crystal growth of uranium and neptunium boronates and borates: a low-temperature route to the first neptunium(V) borate. 
Molten methylboronic acid has been used as a reactive flux to prepare the first neptunium(V) borate, NpO(2)[B(3)O(4)(OH)(2)] (NpBO-1), and the first actinide boronate, UO(2)(CH(3)BO(2))(H(2)O) (UCBO-1).  NpBO-1 contains cation-cation interactions between the neptunyl units.  In contrast, the presence of the methyl groups in the uranyl boronate leads to a one-dimensional structure.