A new monohydrogendecavanadate (V)-dihydrogendecavanadate (V) with dibutylammonium cations [C8NH20](9)[H2V10O28] [HV10O28].2.13H(2)O: Synthesis, crystal structure, vibrational and optical properties

摘要

A new decavanadate, [C8NH20](9)[H2V10O28][HV10O28].2.13H(2)O, was synthesized by slow evaporation from aqueous solution and characterized by IR, Raman and UV-Vis spectroscopies. The crystal structure was solved by single-crystal X-ray diffraction. [C8NH20](9)[H2V10O28][HV10O28].2.13H(2)O consists of dihydrogendecavanadate [H2V10O28](4-), monohydrogendecavanadate [HV10O28](5-), dibutylammonium cations and water molecules. The decavanadate units are assembled in tetramers arrays by interanionic hydrogen bonds O-H center dot center dot center dot O and cation-anion N-H center dot center dot center dot O interactions. The dibutylammonium [(CNH20)-N-8](+) cations and water molecules connect the tetramers into a three-dimensional network. The presence of the two types of units, [HnV10O28]((6-n)-) with n = 1 and n = 2, in one compound was not yet observed and is herein reported for the first time. The IR and Raman spectra exhibit characteristic bands of all groups present in the structure. The optical analysis shows that this compound is a semiconductor material with an optical band gap of 2.59 eV. (C) 2015 Elsevier B.V. All rights reserved.