Structural characterization, AC conductivity, optical properties and biochemical study of a new hybrid phosphate: Scavenger of free radicals

摘要

AbstractSingle crystal of the hybrid compound [p-(F)C6H4NH3]6P6O18·2H2O has been grown with sizes up to 0.65?×?0.45?×?0.3?mm3by the slow evaporation method. The crystal structure of this material was determined by single crystal X-ray diffraction. It crystallizes in the triclinic space group P1ˉwith the lattice parameters a?=?10.16(3) ?, b?=?15.87(3) ?, c?=?16.36(4) ?, α?=?80.93(2)°, β?=?85.92(18)°, γ?=?85.31(2)°, V?=?2591.1(12) ?3and Z?=?2. Its crystal structure is a packing of alternated inorganic and organic layers parallel to (a, c) planes. The cohesion of the structure is essentially ensured by a hydrogen bonding network as well as electrostatic and Van Der Waals interactions and also F…F interactions so as to increase the stability of the 3D-network. The effect of the nature of the substituent in para-position with respect to amine group on obtained structures and on other studied properties was discussed. Crystal symmetry is confirmed by31P MAS-NMR. Furthermore, IR characteristics and thermal analysis are given. The luminescent properties of this material have been carried out at room temperature based on UV absorption spectroscopy data. AC conductivity of this compound has been investigated by means of impedance spectroscopy measurements in the 303–383?K temperature range. The antioxidant study was determined,in?vitro, using 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl radical and reducing power and with ascorbic acid as a control. X-rays structural results are correlated with electrical and antioxidant findings.Graphical abstractDisplay OmittedHighlights?Organic–inorganic hybrid cyclohexaphosphate was synthesized at room temperature.?Layers organization of atomic arrangement showing two independent P6O18rings.?The crystal packing stabilized by a set of hydrogen bonds and F…F interactions.?Electric properties were studied showing two mechanisms of conduction and two relaxation processes.?展开▼