Crown ether-like discrete clusters for sodium binding and gas adsorption

Abstract

Hexanuclear polyoxomolybdenum-based discrete supermolecules Nax[MoV6O6(μ2-O)9(Htrz)6-x(trz)x]·nH2O (x = 0, n = 15, 1; x = 1, n = 12, 2; x = 2, n = 10, 3; x = 2, n...

Hexnuclear, octanuclear, dodecanuclear, and hexadecnuclear polyoxomolybdenum(v)-based porous materials for selective adsorption of gases

“…The structure of 1 is similar to Anderson-type polyoxometalates, 27 except that the center of 1 is not occupied by other heteroatoms, but forms a pore. In our recent report, a similar complex of 1 H -1,2,3-triazole product [Mo 6 O 6 (μ 2 -O) 9 (Htrz) 6 ]·15H 2 O can not be repeated, 28 while delocalized 1 H -benzotriazole product [Mo 6 O 6 (μ 2 -O) 9 (Hbtz) 6 ]·21H 2 O ( 1 ) is obtained with 62.8% yield in this experiment. Similarly, 2 also has a pore, which is different from the reported {Mo 8 } structures with the center coated by oxalate anions.…”

“…The pore size of 4 , which is also a {Mo 8 } ring, is smaller than that of 2 as discussed previously. 28 Furthermore, triazoles can act as strong coordination sites with molybdenum( v ) ions, thus greatly improving the stabilities of these frameworks.…”

Crown ether-like octanuclear molybdenum(v) clusters for cation binding and gas adsorption

“…Strong and wide absorption bands were observed at 3346 cm −1 for 1 and at 3346 cm −1 for 2 , which represented the stretching vibration ν (OH − ) of free water molecules. For 1–3 , the peaks at 465, 1397 and 665 cm −1 correspond to the typical N–H and C–H vibration absorptions in the 3-aminopyrazole, respectively, 42 which were compared with the infrared spectrum of free pyrazole by referring to the Spectral Database for Organic Compounds (SDBS). Besides, there are characteristic vibration peaks of ν (MoO) and ν (Mo–O–Mo) bonds in 1–3 for the strong bands around 800–970 and 630–730 cm −1 .…”