Neutral Mo₆Q₈-clusters with terminal phosphane ligands – a route to water-soluble molecular units of Chevrel phases

Abstract

Despite the numerous works on Chevrel phases, their building blocks – molecular compounds containing {Mo6Q8} cluster core, are hardly presented in literature. Here we present rare examples of phosphane molybdenum...

Water-Soluble Chalcogenide W6-Clusters: On the Way to Biomedical Applications

“…Phosphine ligands are coordinated to W atoms by a phosphorus atom ( Figure 1 ). A similar type of coordination of PPh 2 CH 2 CH 2 COOH was previously reported for molybdenum and rhenium clusters, namely [{Mo 6 Q 8 }(PPh 2 CH 2 CH 2 COOH) 6 ] and [{Re 6 Q 8 }(PPh 2 CH 2 CH 2 COOH) 6 ] 2+ [ 22 , 44 ]. An analysis of the bond lengths shows differences in the M–P distances for the cluster family [{M 6 Q 8 }(PPh 2 CH 2 CH 2 COOH) 6 ] n (M = Mo, W, Re) ( Table 1 ).…”

“…Both compounds are isostructural to each other and to molybdenum analogs [{Mo 6 Q 8 }(PPh 2 CH 2 CH 2 COOH) 6 ]·4.5H 2 O·2.5Et 2 O [ 44 ] and crystallize in triclinic space group P (Z = 1). The crystallographic data are summarized in Table S1, Supplementary Materials .…”

Chemical Diversity of Mo5S5 Clusters with Pyrazole: Synthesis, Redox and UV-vis-NIR Absorption Properties

“…The main bond lengths in the cluster cations are summarized in Table 1 . Comparing the structure of the new S-containing clusters with the previously published selenide complexes, one can observe a decrease in the size of the Mo 5 pyramid in all directions, which is typical for other cluster complexes depending on the chalcogen in the cluster core [ 27 ]. The oxidation of the cluster core ( [1 red ] + to [1 ox ] 2+ ) leads to a slight broadening of the pyramid base and a decrease of the distances in the lateral faces, i.e., a flattening of the pyramid.…”

Unusual Square Pyramidal Chalcogenide Mo5 Cluster with Bridging Pyrazolate-Ligands

“…The consistent development of the chemical manipulation of these substances has led to a transition from polymeric insoluble compounds to molecular discrete clusters [ 2 ], which are often soluble in various solvents. The clusters containing {Mo 3 Q 7 }, {Mo 3 Q 4 } [ 4 ], and {Mo 6 Q 8 } (Q = O, S, Se, Te) [ 5 , 6 , 7 ] cores ( Figure 1 ) are the most studied in this way. However, other chalcogenide cluster compounds with cores of {Mo 2 Q 4 } [ 8 ], {Mo 4 Q 4 } [ 4 ], {Mo 9 Q 11 } ( Figure 1 d) [ 9 ], {Mo 12 Q 14 } [ 10 ], and {Mo 15 Q 17 } [ 11 ] are also known in the literature.…”