A novel Rb borate RbB5O7(OH)2.H2O has been synthesized by the low-temperature molten salt method, which has been analyzed and demonstrated to crystallize in the space group of P2/n in the monoclinic system with the following crystal parameters by the single crystal X-ray diffraction: a=0.7640(2)nm，b=0.9019(3)nm，c=1.0833(3)nm，β=103.681(5)°，V=0.7252(4) nm3，Z=2. Besides, the crystal structure shows that the [B5O7(OH)2]- units composed of BO3、BO2(OH) and BO4 interconnect and form infinite chains, which then forms a 3D net structure of RbB5O7(OH)2.H2O with ten-coordinated Rb cations. Meanwhile, the compound has also been characterized by XRD, IR and TGA.
low-temperature molten salt method; Rb borates; single crystal structures; chain structures
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