A nonmetal pentaborate [C 2 H 10 N 2 ][B 5 O 8 (OH)] ( I ) was synthesized by a solvothermal method at 150 °C and characterized by elemental analysis, IR, thermogravimetric analysis, and X-ray diffraction. The structure of I was determined by a single-crystal technique. It crystallizes in the monoclinic system with space group Cc, a = 6.7085 (13) Å, b = 11.437(2) Å, c = 12.530(3) Å, and β = 95.41(3)°. Powder second-harmonic generation (SHG) efficiency measurements with Nd:YAG laser (1064 nm) radiation show that [C 2 H 10 N 2 ][B 5 O 8 (OH)] has a SHG efficiency approximately 1.2 times of that of potassium dihydrogen phosphate (KDP).
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Yang⧫ et al. (2007) studied this question.
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