Abstract
Zn based Metal-Organic Framework (MOF), Zinc 1,4-benzenedicarboxylate (ZnBDC) has been synthesized and incorporated with ionic liquid (IL) 1-butyl-3 methylimidazolium bromide (BMIMBr) at optimum 50 wt% of IL. Interaction of BMIMBr in the micropores of ZnBDC-MOF is investigated by XPS, scanning EXAFS and inelastic neutron spectroscopy. Significant increase in binding energies of Zn spin-orbit peaks upon IL incorporation is observed from XPS spectra indicating motion of Br− anions of the IL BMIMBr towards the unsaturated Zn cluster of ZnBDC-MOF. The k-space periodicity as well as the local coordination geometry of Zn K-edge is investigated from the scanning EXAFS and XANES spectra. Asymmetric oscillation periodicity has been observed from the k-space scanning XANES spectra upon IL incorporation. Difference in peak positions of oxygen and zinc are observed from the R-space scanning EXAFS spectra suggesting change in coordination geometry due to dehydration of Zn2+ ion in the ZnBDC-MOF upon IL incorporation. Incorporation of IL in the pores of ZnBDC-MOF gives rise to increased scattering intensity in the Inelastic Neutron Scattering (INS) spectra, which is attributed to the displacement of IL ions in the MOF pores.
Highlights
X-ray Photoelectron Spectroscopy (XPS) is an efficient technique to determine the elemental composition of Metal-Organic Framework (MOF) as well as the structural change in inorganic metal nodes upon incorporation of guest molecules
Confinement of ionic liquid (IL) ions in the micropores of ZnBDC-MOF has been investigated with incorporation of optimum 50 wt% of butyl-3 methylimidazolium bromide (BMIMBr)
BET analysis depicts the reduction in surface area as well as pore volume of the nanocomposite upto 750 m2/g and 0.28 cm3/g respectively, at 50 wt% IL incorporation as the pores of the ZnBDC-MOF are filled by the ions of IL
Summary
X-ray Photoelectron Spectroscopy (XPS) is an efficient technique to determine the elemental composition of MOFs as well as the structural change in inorganic metal nodes upon incorporation of guest molecules. Investigated the Pt-N coordination through XPS, XANES and EXAFS and reported the ultrahigh loading of Pt in ultrathin nanosheets of Cu based MOF for efficient photocatalytic performance. Neutron Inelastic Scattering (INS) spectroscopy can reveal the probable interaction of IL ions with the MOF. The modulation or shifting of defect sites present in the MOF can be investigated to enhance the microporosity for better entrapping of ions of ILs. Neutron scattering spectra can determine any structural defect or shifting of any functional group present in the metal clusters or in the organic linkers of MOF. The interaction of IL ions with the Zn metal nodes or the linker moieties of ZnBDC-MOF has been analyzed through Scanning EXAFS, XPS and Inelastic Neutron Scattering spectroscopy
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