Syntheses, structures and spectroscopy of new heteroselenometalates

Chemistry of the Tetraselenomolybdate Anion: Syntheses, Spectroscopic Results, and Structural Characterizations of Polynuclear Mo−Cu−Se Compounds Containing Thiolate Ligands

“…The Cu−Se bond lengths [2.365(3)−2.407(3) Å] in 2 agree well with those in 1a [2.356(2)−2.374(2) Å], which suggests that Cu−Se distances are not affected by the coordination geometries of the Cu atoms and different dialkyldithiocarbamate ligands. The average Mo−Cu distance of 2.724(2) Å in 2 with tetrahedral coordinated Cu atoms is compatible to that (2.730(2) Å) in 1a and longer than those with trigonal coordinated Cu atoms found in [Se 2 MoSe 2 (CuCN)] 2- [2.674(1) Å],6b [MoSe 4 (CuCN) 2 ] 2- [2.685(1) Å],6b and [OMoSe 3 Cu 3 Cl 3 (Py)] 2- [2.667(2) and 2.689(1) Å] . These values, together with the very acute angles of Mo−Se−Cu are an indication of a possible Mo−Cu bonding interaction.…”

“…The chemistry of [MS 4 ] 2- (M = Mo, W) anions and their related compounds has been extensively investigated owing to their relevance to biological systems, rich structural chemistry, and special reactive properties as well as potential application in nonlinear optical materials, − whereas that of [MSe 4 ] 2- (M = Mo, W) anions and their related compounds have received attention only in recent years . Up to the present, only a few examples of compounds containing [MSe 4 ] 2- unit have been known. − Ibers has studied interactions of [WSe 4 ] 2- or [MoSe 4 ] 2- with the coinage-metal cations Cu + , Ag + , Au + , and Ni 2+ and reported successively a number of coinage-metal/MSe 4 2- (M = Mo, W) complexes with linear, cuboidal, and planar skeletons, in which the tetraselenometalate [MSe 4 ] 2- (M = Mo, W) acts as a versatility ligand coordinating to one to four coinage-metal M‘ (M‘ = Cu, Ag, Au) atoms.…”

“…In this system, some possible configurations of polynuclear Mo−Cu−Se molecular clusters are sketched in Figure . The configuration (a) is a so-called cubanelike structure, which has already been prepared and structurally characterized. 6a, We have recently isolated and characterized a compound of defective cubanelike OMoSe 3 Cu 3 cluster core with mixed pyridine and chloride ligands, which belongs to configuration (b). In this paper, we wish to describe the syntheses and spectroscopic properties of a series of Mo−Cu−Se compounds containing thiolate ligands and structrues with MoCu 3 planar (Figure c), MoCu 4 planar (Figure d), and polynuclear MoCu 10 clusters (Figure f), which will expand the known structure types in the selenide system.…”

Chalcogenide centred gold complexes

“…The anionic complexes [Au 2 (CN) 2 (MSe 4 )] 2À and [Au(CN)(MSe 4 )] À have also been reported. 108 The tetraselenoniobiate anion also reacts with gold compounds to give polynuclear species such as [Au 3 (NbSe 4 )(PPh 3 ) 3 ] or [Au 2 Nb 2 Se 4 Cl 2 (PMe 3 ) 6 ], 109 in which the selenide ligands are bridging two or three metal atoms. Some examples of these tetraselenometallate-gold complexes are collected in Fig.…”

A W–Ag–Se cluster compound: (μ3-bromo)(μ3-tetraselenidotungstide)tris(triphenylphosphinesilver) ethanol solvate, [(μ3-Br)(μ3-WSe4)(AgPPh3)3].EtOH

“…However, research on the corresponding chemistry of MSe42-(M = Mo, W) has only been carried out recently (Ansari & Ibers, 1990;Roof & Kolis, 1993). Up to now, only a few mixed-metal selenide compounds containing Salm & Ibers, 1994;Salm et al, 1995), [(#3-I)(#3-MSen)(AgL)3] (M = Mo, W; L = PMe2Ph, PPh3; Ansari et al, 1994;Duet al, 1994;Zhang et al, 1997) and [MoSe4(CuR2-NCSE)x] 2-(R = Et, Me; x -3, 4; Hong et al, 1997). We report herein the crystal structure of [(#3-Br)(/~3-W-Sea)(AgPPh3)3 ]'EtOH, (I).…”