Synthesis of 1-(1-ferrocenylethyl)-pyridinium chloride and its hybrid materials with lindquist-type polyoxometalates
摘要:
A new ferrocene derivative, 1-(1-ferrocenylethyl)-pyridinium (fep = CpFeCp-CH(CH(3))-Py(+)) chloride, and two charge-transfer salts (CTSs) based on the cationic fep donor and Lindqvist-type polyoxometalate acceptors, [fep](2)[Mo(6)O(19)] (1) and [fep](2)[W(6)O(19)] (2), were synthesized. fepCl was characterized by elemental analysis, IR spectroscopy and (1)H NMR and the two CTSs were characterized by elemental analysis, IR spectroscopy, UV-vis diffuse reflectance spectrum, cyclic voltammetry, fluorescence spectrum and single crystal X-ray diffraction. X-ray crystallographic studies of the brownish red CTSs 1 and 2 reveal that they are isostructural and crystallize in the monoclinic space group P2(1)/n. In salts 1-2, fep and polyoxoanions are cocrystallized by Coulombic forces, and there also exist the complex C-H center dot center dot center dot pi and pi center dot center dot center dot pi stacking interactions between the adjacent fep cations and C-H center dot center dot center dot O hydrogen bonds between the adjacent fep cations and polyanions. The UV-vis diffuse reflectance spectra indicate the presence of a broad charge-transfer band between 500 and 850 nm for 1-2, and CT character of 1 and 2 is also confirmed by the Mulliken correlation between the CT transition energies and the reduction potentials of the polyoxometalate acceptors. (C) 2010 Elsevier B. V. All rights reserved.
Synthesis of 1-(1-ferrocenylethyl)-pyridinium chloride and its hybrid materials with lindquist-type polyoxometalates
摘要:
A new ferrocene derivative, 1-(1-ferrocenylethyl)-pyridinium (fep = CpFeCp-CH(CH(3))-Py(+)) chloride, and two charge-transfer salts (CTSs) based on the cationic fep donor and Lindqvist-type polyoxometalate acceptors, [fep](2)[Mo(6)O(19)] (1) and [fep](2)[W(6)O(19)] (2), were synthesized. fepCl was characterized by elemental analysis, IR spectroscopy and (1)H NMR and the two CTSs were characterized by elemental analysis, IR spectroscopy, UV-vis diffuse reflectance spectrum, cyclic voltammetry, fluorescence spectrum and single crystal X-ray diffraction. X-ray crystallographic studies of the brownish red CTSs 1 and 2 reveal that they are isostructural and crystallize in the monoclinic space group P2(1)/n. In salts 1-2, fep and polyoxoanions are cocrystallized by Coulombic forces, and there also exist the complex C-H center dot center dot center dot pi and pi center dot center dot center dot pi stacking interactions between the adjacent fep cations and C-H center dot center dot center dot O hydrogen bonds between the adjacent fep cations and polyanions. The UV-vis diffuse reflectance spectra indicate the presence of a broad charge-transfer band between 500 and 850 nm for 1-2, and CT character of 1 and 2 is also confirmed by the Mulliken correlation between the CT transition energies and the reduction potentials of the polyoxometalate acceptors. (C) 2010 Elsevier B. V. All rights reserved.