Synthesis, characterization and fluorescence properties of two novel inorganic-organic hybrid gallium/indium borates

Two new gallium/indium borates, Ga(en)(2)[B5O8(OH)(2)]center dot H2O (I) and In(en)(2)[B5O8(OH)(2)]center dot H2O (II), have been synthesized under ionothermal conditions and characterized by elemental analysis, FT-IR, XRD and thermal analysis. Single X-ray diffraction studies reveal that compounds I and II are isostructural and isomorphous. Both borates crystallize in the monoclinic system with space group P2(1)/c. Their structures are characterized as an inorganic-organic hybrid 1D helical chain constructed by Ga/In-O-B motif. The 1D helical chains are held together through the O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds, forming a 3D supra-molecular structure. Furthermore, their fluorescence properties have also been studied. (C) 2013 Elsevier B.V. All rights reserved.