Molybdenum(II) cluster compounds involving alkoxy groups

Nannelli, Piero; Block, B. P.

doi:10.1021/ic50069a047

Cited by 54 publications

(21 citation statements)

References 2 publications

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“…IR analysiss hows the presence of carbonyl (1750 cm À1 ), carboxylate (1650-1350 cm À1 ), hydroxyl (1055 cm À1 )a nd epoxy/ether(% 1224 cm À1 )g roups as the characteristic vibrations of the GO sheets (Figure 7). After immobilizationo ft he molybdenum cluster, new bands appeared at 977 and 1110cm À1 .S imilar IR bands have been previously reported for octahedral molybdenumc lustersw ith methoxido ligands, such as Na 2 [Mo 6 Cl i 8 (OMe) a 6 ]( 1047 cm À1 )a nd Na 2 [Mo 6 (OMe) i 8 (OMe) a 6 ]( 1047 and % 1065 cm À1 ), [41] and also for (Na(CH 3 OH) 5 ) 2 [Mo 6 X i 8 (OMe) a 6 ]( X = Cl i ,1 048 cm À1 ;X i = Br, 1044 cm À1 )c lusterc ompounds,a nd were assigned to Mo(OÀC) vibrations. [40] The C=Oa nd CÀO(O) vibrations characteristic of the carbonyl and carboxylate functionalities of GO (1650-1750 and 1350-1400 cm À1 ,r espectively)s eem to be unaffected after cluster immobilization, in agreement with the XPS results.…”

Section: Resultssupporting

confidence: 67%

In Situ Generation of Active Molybdenum Octahedral Clusters for Photocatalytic Hydrogen Production from Water

et al. 2016

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The photocatalytic hydrogen evolution reaction (HER) from water under homogeneous and heterogeneous conditions is explored for the {Mo6 Br(i) 8 }(4+) cluster core based unit starting from (TBA)2 [Mo6 Br(i) 8 F(a) 6 ] (TBA=tetra-n-butylammonium; "i" and "a" refer to the face-capping inner and terminal apical ligand, respectively). The catalytic activity of {Mo6 Br(i) 8 }(4+) is enhanced by the in situ generation of [Mo6 Br(i) 8 F(a) 5 (OH)(a) ](2-) , [Mo6 Br(i) 8 F(a) 3 (OH)(a) 3 ](2-) , and [Mo6 Br(i) 8 (OH)(a) 6 ](2-) , which are identified by ESIMS, luminescence, and NMR techniques. Full substitution of F(-) by OH(-) leads to the formation of (H3 O)2 [Mo6 Br(i) 8 (OH)(a) 6 ]⋅10 H2 O; its structure was determined by single-crystal XRD. The immobilization of the active {Mo6 Br(i) 8 }(4+) onto graphene oxide (GO) surfaces enhances its stability under catalytic conditions. The catalytic activity of the resulting (TBA)2 Mo6 Br(i) 8 @GO material is improved with respect to GO, but is reduced compared to the activity under homogeneous conditions because of changes in the GO semiconducting properties as well as lower activity and/or accessibility of the anchored cluster.

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Section: Resultssupporting

confidence: 67%

In Situ Generation of Active Molybdenum Octahedral Clusters for Photocatalytic Hydrogen Production from Water

et al. 2016

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“…Methoxide can also occupy these positions [43,44]. Finally, it has also been shown that allqrl groups can be substituted into the outer coordination positions [39].…”

Section: Formation Of Adductsmentioning

confidence: 97%

“…The pg-ligands of the clusters can be substituted with other halides, alkoxides, and chalcogenides as well [13,42,[44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and reactivity of sulfided hexanuclear molybdenum cluster compounds

Spink

1990

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“…Introduction. The synthesis of salts containing octahedral Mo6 clusters with methoxy, ethoxy or phenoxy ligands is well known (Nannelli & Block, 1968, 1969 and so are the crystal structures of the methoxy derivatives (Chisholm, Heppert & Huffman 1984). We are interested in the introduction of al-* To whom all correspondence should be addressed.…”

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confidence: 99%

“…Experimental. The compound was obtained by metathesis of Na2Mo6CIs(OCH3)6, prepared according to the procedure given by Nannelli & Block (1968), with (E)-cinnamyl alcohol. A solution of Na2-Mo6Cls(OCH3)6 in (E)-cinnamyl alcohol was stirred at room temperature for 24 h. The methanol formed in the reaction distilled off continously under reduced pressure.…”

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confidence: 99%