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)−(image for 1 and 3, and image 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), image, image, image, image, image, image; 2, monoclinic, P21/c (No. 14), image, image, image, image, image, image; 3, triclinic, space group P-1 (No. 2), image, image, image, image, image, image, image, image.