Synthesis, characterization and photocatalytic studies of mesoporous silica grafted Ni(ii) and Cu(ii) complexes

Abstract

The mesoporous silica grafted nickel(II) and copper(II) complexes of the Schiff base ligand were synthesized. The functionalization of the ligand was achieved by the Schiff base condensation of 3-APTES and O,Oˈ-mono methylene bis(salicylidene). The Schiff base moiety was subsequently grafted with MCM41, followed by complexation with the metal salts. The compounds were characterized by spectral( Fourier Transform Infrared spectroscopy (FTIR), diffuse reflectance UV-Vis spectroscopy (DRS/UV-Vis), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS)), thermal (Thermo Gravimetric Analysis (TGA)) microscopic(High Resolution Transmission Electron Microscopy (HRTEM) ) and surface Brunauer-Emmett-Teller (BET) method, N 2 -sorption isotherms) analysis. The compounds were employed in the photo oxidation of Methyl Orange (MO) and Reactive Red198 (RR). The copper complex exhibits higher activity in the photo degradation of the dyes. The reusable photocatalysts show comparable activity to that of fresh catalyst without loss of their catalytic nature

Coupled LiPF6 Decomposition and Carbonate Dehydrogenation Enhanced by Highly Covalent Metal Oxides in High-Energy Li-Ion Batteries

“…This assignment is supported by DFT calculations shown in Figure d right panel, which shows blueshifts of PF 5 and PF 3 O relative to PF 6 – , and by previous detection of gaseous PF 3 O by differential electrochemistry mass spectroscopy measurement of NMC111 charged to 4.8 V Li . Other more oxygen-rich and fluorine-poor species such as PF 2 O 2 – and PFO 3 -like species and/or transition-metal oxyfluorides can also contribute to this broad feature. However, we should note that PF 3 O is highly reactive gaseous species and cannot be captured by the ex situ characterization undertaken by this work.…”

Bimetallic Aluminum‐ and Niobium‐Doped MCM‐41 for Efficient Conversion of Biomass‐Derived 2‐Methyltetrahydrofuran to Pentadienes

“… [21] The presence of Si−O, Al−O and Nb−O species within AlNb‐MCM‐41(35/1/0.9) has been confirmed by O1s deconvoluted spectrum (Figure S5). [22] Energy dispersive X‐ray (EDX) analysis identified the ratios of Si/Al/Nb and confirmed the homogeneous dispersion of Al III and Nb V sites within AlNb‐MCM‐41(35/1/0.9) (Figure 1 d–g). Transmission electron microscopy (TEM) images of these samples confirmed the regular mesoporous structure and parallel channels, consistent with the structure of MCM‐41[ 19 , 29 ] (Figure 1 h, Figure S4a‐c).…”

Luminescent Dye Molecules for New Photonic Antennae

“…The results obtained show that both complexes responded positively in the UV-visible region: The Ni(II) complex showed an absorption band at 339 nm, whereas the Cu(II) complex showed a band with a maximum peak at 316 nm. (Ramanjaneya Reddy & Balasubramanian, 2015) Such values obtained confirmed that the complexes can retain their optical properties once in the silica, with strong absorption and emission of light in the UV-visible range, and can therefore be utilized for several important applications as in photocatalysis and light-emitting devices.…”