Syntheses and crystal structures of three new borates templated by transition-metal complexes in situ

Three new cobalt borate compounds, [Co(DIEN)2][B5O6(OH)4]2 (DIEN=diethylenetriamine) (1), [B5O7(OH)3Co(TREN)] (TREN=tris(2-aminoethyl)amine) (2), and [Co2(TETA)3][B5O6(OH)4]4 (TETA=triethylenetetramine) (3) have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR, elemental analysis and thermogravimetry. The structures exhibit interesting 3D supramolecular hydrogen-bonded architectures, involving the similar borate polyanion [B5O6+n(OH)4−n](n+1)−(n=0n=0 for 1 and 3, and n=1n=1 for 2) and the templating transition metal complexes which are generated in situ under mild solvothermal conditions. Crystal data: 1, monoclinic, space group C2/m   (No. 12), a=15.2372(3)Å, b=11.5987(2)Å, c=8.4163(3)Å, β=93.601(4)°β=93.601(4)°, V=1484.49(7)Å3, Z=2Z=2; 2, monoclinic, P21/c   (No. 14), a=8.9881(3)Å, b=20.7648(5)Å, c=9.3681(2)Å, β=99.926(4)°β=99.926(4)°, V=1722.25(8)Å3, Z=4Z=4; 3, triclinic, space group P  -1 (No. 2), a=12.3717(4)Å, b=12.9653(8)Å, c=19.0925(3)Å, α=77.009(5)°α=77.009(5)°, β=80.095(2)°β=80.095(2)°, γ=82.334(3)°γ=82.334(3)°, V=2925.3(2)Å3, Z=2Z=2.

Three new cobalt borates, [Co(DIEN)2][B5O6(OH)4]2 (1), [B5O7(OH)3Co(TREN)] (2) and [Co2(TETA)3][B5O6(OH)4]4 (3), have been synthesized under hydrothermal conditions. Based on the similar FBBs, [B5O6+n(OH)4−n](n+1)−, the interesting hydrogen-bonded borate anion host lattices are formed and employed to accommodate the transition-metal complex templates, which are generated in situ.Figure optionsDownload as PowerPoint slide