Abstract
Two new pentaborates [M(dap)3][B5O6(OH)4]2·H2O (M = Co (1) and Ni (2); dap = 1,2-diaminopropane) have been hydrothermally synthesized. Both structures were determined by single crystal X-ray diffraction and further characterized by elemental analysis, FT-IR, thermogravimetric analysis and photoluminescence spectroscopy. Two compounds are isostructural and consist of isolated pentaborate [B5O6(OH)4]− anions and [M(dap)3]2+ complex cations. The anionic [B5O6(OH)4]− groups are linked by extensive hydrogen bonds to form a 3-D supramolecular framework with large channels, in which the transition-metal complex templates are located. The luminescent properties of 1 and 2 were studied, and blue luminescence occurs with an emission maximum at 405 and 408 nm upon excitation at 332 and 328 nm respectively. Crystal data: 1, monoclinic, space group P21/c (No. 14), a = 9.7159(5) A, b = 29.3372(19) A, c = 11.5121(6) A, β = 103.286(5)°, V = 3193.6(3) A3, Z = 4; 2, monoclinic, space group P21/c, a = 9.7264(4) A, b = 29.3810(16) A, c = 11.5185(6) A, β = 103.249(4)°, V = 3204.0(3) A3, Z = 4.
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