A novel lead borate of NaPb4(H2O)(B5O9)2·BO3 with nonlinear optical property

• Compound 1 has a 3-D oxoboron framework with 8-, 9- and 10-membered ring channels built by B5O12 cluster units.
• Second-harmonic generation (SHG) measurements on the powder samples reveal that 1 exhibits SHG efficiency approximately 2 times that of KH2PO4 (KDP).

A new mixed metal borate, NaPb4(H2O)(B5O9)2·BO3, with an acentric structure has been successfully made under hydrothermal conditions and structurally characterized by IR spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and single-crystal X-ray diffraction, respectively. The structural analysis shows that 1 crystallizes in the orthorhombic space group Pnn2 (No. 34) with a = 11.3724(5) Å, b = 11.4455(4) Å, c = 6.5578(2) Å and Z = 2. In the structure 1, the structural building unit, B5O12 cluster, connects adjacent six same ones to form a 3-D oxoboron framework with 8-membered ring (MR) and 10-MR channels along the c-axis. The Pb atoms and coordinated water molecules are located in the 8-MR channels, while the 10-MR channels were occupied by the chains built by Na atoms and the BO3 groups. Second-harmonic generation (SHG) measurements on the powder samples reveal that 1 exhibits SHG efficiency approximately 2 times that of KH2PO4 (KDP). Also it has a UV cutoff edge below 220 nm.

A novel acentric lead borate, NaPb4(H2O)(B5O9)2·BO3 has been hydrothermally made, in which the 3-D oxoboron framework with 8-membered ring (MR) and 9- and 10-MR channels is built by B5O12 cluster units, showing the second-harmonic generation efficiency approximately 2 times that of KH2PO4 (KDP), and its UV cutoff edge below 220 nm.Figure optionsDownload as PowerPoint slide