摘要
A new mixed-metal polyborate, Na5Li[B12O18(OH)(6)]center dot 2H(2)O (1), has been synthesized using solvothermal method and characterized by IR spectroscopy, thermogravimetric analysis, UVeVis spectroscopy, powder and single-crystal X-ray diffraction, respectively. It crystallizes in the trigonal space group R-3c (No. 167) with unit cell parameters of a = b = 9.6767(6) angstrom, c = 36.358(5) angstrom, and Z = 6. Its structure features unprecedented 3D framework constructed from novel honeycomb-shaped inorganic Na-O sheets with unique 12-MR sodium rings and supramolecular polyborate 2D layers of lithium-centered [B12O18(OH)(6)](6-). UVeVis spectral characterization indicates that compound 1 is a wide-band-gap semiconductor.