Construction of polyoxometalate-based metal−organic frameworks through covalent bonds for enhanced visible light-driven coupling of alcohols with amines

The tail of imidazole regulated the assembly of two robust sandwich-type polyoxotungstate-based open frameworks with efficient visible-white-light-driven catalytic oxidation of sulfides

“…The above results demonstrated that LCU-20 could be a superior catalyst for photocatalytic reactions than LCU-21, which can be attributed to the collaborative optimization of stronger visible light harvesting, more efficient charge separation, and higher efficiency for O 2 activation. 44 For further investigating the white-light-driven photocatalytic properties of LCU-20 and -21 for realizing efficient energy utilization, the aerobic oxidation of methyl phenyl sulfide (MPS) as the model was encouraged to be carried out under 10 W white LED light irradiation and the optimized results are listed in Table 1. Under light illumination but without the addition of POTOFs, the desired product methyl phenylsulfone (MPSO) could hardly be obtained under a white light LED for 36 h (Table 1, entry 1).…”

“…The above results demonstrated that LCU-20 could be a superior catalyst for photocatalytic reactions than LCU-21 , which can be attributed to the collaborative optimization of stronger visible light harvesting, more efficient charge separation, and higher efficiency for O 2 activation. 44…”

Metalloligand Hybrid Polyoxometalates for Efficient Selective Photocatalytic Oxidation of Sulfides to Sulfoxides under Visible-Light Irradiation

“…The metalloligand and POMs are connected through Cd–O covalent bonds. This covalent connection mode not only makes the contact tighter between the metalloligand and POMs and maximizes the synergistic effect between them but also accelerates the transfer process of photogenerated electrons from the metalloligand to POMs and then achieves higher photocatalytic activity. , The Cd­(II) ions are in twisted octahedral geometry defined by two oxygen atoms from one metalloligand and five oxygen atoms provided by [SiW 11 O 39 ] 8– (Figure S3). By connecting the hydrogen bonds C14–H14···O26 (2.263 Å) head-to-tail between the structural units, RuCd–SiW forms a one-dimensional (1D) chain structure along the b -axis (Figure b); then, multiple such 1D chains form a two-dimensional (2D) laminar structure along the a -axis through the hydrogen bonds C16–H16···O23 (2.632 Å) (Figure c), and these formed 2D lamellar structures are stacked by hydrogen bonds C12–H12···O6 (2.421 Å) and C24–H24···O26 (2.604 Å) (Figure d) along the c -axis, eventually forming the sturdy three-dimensional (3D) network structure (Figure e).…”

“…This covalent connection mode not only makes the contact tighter between the metalloligand and POMs and maximizes the synergistic effect between them but also accelerates the transfer process of photogenerated electrons from the metalloligand to POMs and then achieves higher photocatalytic activity. 31,32 The Cd(II) ions are in twisted octahedral geometry defined by two oxygen atoms from one metalloligand and five oxygen atoms provided by [SiW 11 O 39 ] 8− (Figure S3). 1d) along the c-axis, eventually forming the sturdy three-dimensional (3D) network structure (Figure 1e).…”

Enhanced Photoinduced Baeyer–Villiger Oxidation of Ketones by Introducing Trinuclear Ruthenium Clusters into Polyoxometalate-Based Metal–Organic Frameworks

“…In particular, the O 2 /aldehyde system known as the Mukaiyama method is very attractive in industrial production owing to its advantages of safety, green nonpollution, and high yield. , Recently, researchers have reported a lot of excellent work to develop a low-cost B–V oxidation process based on the Mukaiyama method. Nevertheless, conventional thermo-catalytic technologies often require high-temperature energy to trigger the catalytic reaction, which still suffers from the issues of high energy consumption and advanced facility requirements, thereby limiting the scalability of the process. − Recent studies show that photocatalytic technology has become a research hotspot in the field of organic synthesis by utilizing economical solar energy as the driving force, with advantages including mild reaction conditions, high selectivity, and environmental friendliness. − Consequently, the development of the photoinduced B–V oxidation process based on the Mukaiyama method is of great research significance.…”