Synthesis and Crystal Structure of the First Aqueous Silver Borate Nitrate Ag3B4O6(OH)2(NO3)

The first aqueous silver borate nitrate Ag3B4O6(OH)2(NO3) has a non-centrosymmetric crystal structure (P43212, a = 10.0196(3) Å, c = 9.2594(2) Å). The compound is prepared by soft hydrothermal synthesis inside an evacuated quartz ampoule. The structure of the resulting 1D–5B-borate compound is formed by [B4O6(OH)2]2– chains consisting of two triborate rings with a common (2Δ3□:(‹Δ2□›–‹Δ2□›–)∞ tetrahedron and NO3 triangles with silver atoms between the rings. The relationship between the structures of Ag3B4O6(OH)2(NO3), Tl2B4O6(OH)2·2H2O and the kernite Na2B4O6(OH)2·3H2O (also formed by [B4O6 (OH)2]2– chains) is discussed.