Simple and straightforward method to prepare highly dispersed Ni sites for selective nitrobenzene coupling to Azo/Azoxy compounds

Investigating the Metal–TiO2 Influence for Highly Selective Photocatalytic Oxidation of Methane to Methanol

“…Figure b shows the high-resolution XPS for Ni 2p 3/2 in Ni–TiO 2 ; the deconvolution of the peaks indicates the presence of Ni 2+ species and Ni 3+ species, suggesting that nickel clusters can be identified as NiO x . , This finding is consistent with prior research utilizing the same impregnation method, which also identified the presence of NiO x clusters . Also, Ni(0) signals are absent in the XPS spectra, excluding the presence of nanoparticles in the sample . The high-resolution spectrum of O 1s (Figure c) can be deconvoluted into three peaks at 529.8, 531.4, and 533.1 eV, which are attributed to lattice oxygen (O 2– ), hydroxyl groups (−OH) or oxygen vacancies (O v ), and surface-adsorbed water (H 2 O). , Also, in the Ti 2p spectra, we identify the presence of Ti 3+ and Ti 4+ sites (Figure d), suggesting that Ni dopants introduce defects in the structure. , …”

“…31 Also, Ni(0) signals are absent in the XPS spectra, excluding the presence of nanoparticles in the sample. 32 The high-resolution spectrum of O 1s (Figure 7c) can be deconvoluted into three peaks at 529.8, 531.4, and 533.1 eV, which are attributed to lattice oxygen (O 2− ), hydroxyl groups (−OH) or oxygen vacancies (O v ), and surface-adsorbed water (H 2 O). 31,33 Also, in the Ti 2p spectra, we identify the presence of Ti 3+ and Ti 4+ sites (Figure 7d), suggesting that Ni dopants introduce defects in the structure.…”

Recent Advances in the Synthesis of Aromatic Azo Compounds

“…Among azo compounds, aromatic azo compounds have a higher π electron conjugation system along with higher chemical stability and thermal stability. Moreover, the substituents on the aromatic ring have a direct impact on their properties, which promoted the design of functional photoresponsive materials at the molecular level [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 ]. As a result, the research and application of aromatic azo compounds have received great attention and undergone significant development in the past ten years, as shown in Figure 1 .…”

Light‐promoted Selective Reduction of Nitroarenes to Azoxy‐, Azo‐ and Hydrazo‐compounds Catalyzed by Bismuth Porphyrin Metal Organic Framework

“…Reduction of nitroarenes as multistep tandem reactions are prone to over reduction to amines, thus, selective generation of metastable intermediates has been an intractable issue. [22][23] And the traditional reduction of nitroarenes was carried out using transition metal catalysis in acidic solution, the resulting high pollution, high cost, low efficiency and a series of problems have hindered the industrialization of azointermediates. Numerous approaches for the reduction of nitroarenes have already been reported as technology advances.…”