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Abstract
With a hydrothermal technique, a novel chiral lead borate (Pb6B11O18(OH)9) has been prepared. The sample has been characterized by powder X-ray diffraction, infrared spectroscopy, energy-dispersive spectroscopy, thermal analysis, and second-harmonic generation powder measurement. The structure of the compound, which crystallizes in the trigonal space group P32 with lattice constants a = 11.7691(7) A and c = 13.3361(12) A has been solved by single-crystal X-ray diffraction analysis. There exist infinite helical chains and finite chain fragments built up from BO4 and BO3 units. In the compound the Pb2+ cations are located in the space between adjacent polyborate anionic chains, compensating the negative charges of the chains. The chiral feature of the lead borate is unique, and because it lacks symmetry center, the compound exhibits distinct NLO properties.
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