A new organic-inorganic hybrid tetrameric polyoxometalate assembled by monovacant Dawson [α2-P2W17O61]10− and trivalent cerium cations

A polyoxometalate cluster-based single-atom catalyst for NH3 synthesis via an enzymatic mechanism

“…The PMA cluster was reported to be an attractive support to stabilize transition metal atoms. 54–60 Our results reveal that the enzymatic mechanism has the lowest overpotential ( η ) of 0.19 V, and thus demonstrate that Mo 1 /PMA is a promising SAC for the eNRR.…”

“…S2,† all the TM atoms considered in this work are expected to anchor at the 4H site on the PMA cluster surface, which is consistent with previous theoretical calculations. 54–56 The calculated binding energies for TM atoms embedded on the PMA surface vary from −4 to −17 eV (Fig. 1a and Table S2†), indicating that these single metal atoms are strongly bound to the PMA support and our designed SACs exhibit high stability.…”

“…It is found that transition metal atoms prefer to locate at the 4H site on the PMA cluster surface in a distorted square-planar geometry, which accords exactly with former work. 54–56 Table S1† presents the key geometry parameters of transition metal atoms anchored on PMA. In PMA, the bond lengths of P–O, Mo–O c , and Mo–O bri are 1.55 Å, 1.70 Å, and 1.93 Å, respectively.…”

“…These results are in good agreement with previously reported experimental and theoretical studies. 54–56 To find out an ideal catalyst for the eNRR, a series of transition metals (TM= Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, W, Re, Os, Ir, Pt, and Au) atoms from the periodic table were tested. As shown in Fig.…”

Synthesis and characterization of self-assembled inorganic–organic hybrid arsenotungstates

“…The lacunary POMs behave as inorganic multidentate ligands which are oxygen rich and can easily bind with transitionmetal (TM) or lanthanoid (Ln) cations, constructing a new class of TM-or Ln-substituted POMs with intrinsic properties. A great number of these substituted POMs have been reported with phosphotungstates (Hu et al, 2015(Hu et al, , 2016Li et al, 2013;Zhao et al, 2014b), silicotungstates (Zhao et al, 2013(Zhao et al, , 2015Sadakane et al, 2000;Zhang et al, 2016) and germanotungstates (Li et al, 2014;Wang et al, 2006b;Sun et al, 2016;Zhao et al, 2014a). In contrast to this, only a few examples of arsenotungstates (As III/V ) have been reported.…”