Novel borate supramolecular frameworks constructed from isolated B4/B5 clusters and 1-D B17-based chains

Three new borates [Cu(1,3-dap)(2)(H2O)(2)][Cu(1,3-dap)(2)(B(OH)(3))2][B4O5(OH)(4)](2) (1, 1,3-dap = 1,3-diaminopropane), [Cu(PY)(4)(H2O)][B5O6(OH)(4)](2)center dot 3PY center dot H2O (2, py = pyridine) and (HDMF)(2) INH(CH3)(3)](4)[NH2(CH3)(2)](2)Mg-2[B17O26(OH)(4)][B17O27(OH)(4)]center dot NH3 (3, DMF = N,N-dimethylformamide) have been synthesized under mild solvothermal conditions and characterized by elemental analysis, IR spectra, diffuse reflectance spectra, thermogravimetric analysis, single -crystal X-ray diffraction and powder X-ray diffraction. I and 2 exhibit 3-D supramolecular hydrogen -bonded architectures constructed from isolated oxoboron clusters [B4O5(OH)(4)](2-) and B5O6(OH)(4)](-), respectively. The structure of 3 features two different 1-D chains built by unprecedented [B17O26(OH)(4)](5-) and [B17O27(OH)(4)](7-) clusters, respectively. And the adjacent chains are alternatively linked by H -bonding to form a 3-D supramolecular framework. (C) 2017 Elsevier B.V. All rights reserved.