Crystal structure of potassium bis(pentaselenido-κ ² Se ¹,Se ⁵)palladate(II), K₂[Pd(Se₅)₂]

Abstract

K2PdSe10, orthorhombic, Pcma (no. 55), a = 8.293(3) Å, b = 10.987(3) Å, c = 16.432(5) Å, V = 1497.1(8) Å3, Z = 4, R gt(F) = 0.0349, wR ref (F 2) = 0.0688, T = 173(2) K.

Generation and Reactivity of Polychalcogenide Chains in Binuclear Cobalt(II) Complexes

“…In contrast to the plethora of reports on the chemistry of transition metal–polysulfido complexes in general, the chemistries of polyselenides and polytellurides are comparatively less developed. 43 , 49 , 110 − 115 While an appreciable number of transition metal–polyselenido and relatively a smaller number of transition metal–polytellurido compounds are now available in the literature, most of these examples feature either metal–polyselenido/polytellurido compounds having Se/Te/P-donor ligands 116 − 124 or only Se/Te-donor ligands (polyselenide/polytelluride) 116 , 117 , 120 − 123 or organometallic compounds, 63 , 67 , 125 − 131 while some other reports include [Fe(Se 3 )L 2 ] 1– (L = N (Dipp)SiMe 3 , Dipp = 2,6-diisopropylphenyl), 132 [Cu 2 (Se 2 )(Bn 3 TACH) 2 ] 2+ 133 and [Mn(dien) 2 ] 2 [SbSe 4 Cu(μ-Se 4 )] (dien = diethylenetriamine). 134 The majority of these metal–polychalcogenido compounds are organometallic compounds.…”

“… 134 The majority of these metal–polychalcogenido compounds are organometallic compounds. Unlike the reactions described in the present work, the synthetic strategy used for the preparation of these reported organometallic compounds, in general, involved either (i) the redox reaction of low-valent metal salts/compounds with elemental chalcogens (S, Se, and Te) 63 , 116 , 118 , 119 , 122 , 125 , 128 , 131 , 133 , 134 or (ii) the reaction of metal complexes with polychalcogenide salts, 117 , 118 , 120 , 121 , 123 , 127 , 132 often for a long time (2–6 days) at high temperatures (80–145 °C). The majority of these reported complexes feature the smallest polychalcogenide units (Se 2 2– /Te 2 2– ) with the exception of compounds such as [{Mn(μ-Se 6 )(tren)} 2 ].…”

Nonheme binuclear transition metal complexes with hydrosulfide and polychalcogenides

“…Quite similar to the observation noted in the case of transition metal–polysulfido complexes, most of the transition metal–polyselenido complexes are again either organometallic compounds 118,178,181,208–213 or contain Se-/P-donor ligands 214–216 or contain only Se-donor ligands. 217–222 On the other hand, only a handful of non-organometallic transition metal–polyselenido complexes have been reported. Examples of such complexes include [{Mn(μ-Se 6 )(tren)} 2 ] (tren = tris(2-aminoethyl)amine) (Scheme 4(a)), 223 [Fe(Se 3 )L 2 ] 1− , [Fe(Se 2 )L 2 ] 1− and [(L 2 Fe)-μ 2 -Se-(FeL 2 )] 2− (L = N(Dipp)SiMe 3 , Dipp = 2,6-diisopropylphenyl) (Scheme 4(b)), 224 [(Co(nacnac)) 2 (μ,η 2 -Se 2 )] (Scheme 4(c)), 225 [Cu 2 (Se 2 )(Bn 3 TACH) 2 ] 2+ (Scheme 4(d)), 226 and [Mn(dien) 2 ] 2 [SbSe 4 Cu(μ-Se 4 )] (dien = diethylenetriamine) (Scheme 4(e)).…”

“…(except for Schemes 4(a), (c), (e), (g), and (h), for which no solution state characterization data were provided). The reported synthetic procedures for the transition metal–polyselenido complexes (Scheme 4), in general, involve either (i) the reaction of the polyselenide salts with metal complexes, often at high temperature (50 °C–150 °C, Schemes 4(a), (e)–(g)) and/or for a long time (2–6 days, Schemes 4(c), (e) and (h)) 209,214,218–220,222,224 or (ii) the redox reaction of elemental selenium with low-valent metal complexes/salts. 109,118,178,210,213–215,217,221 Thus, the development of a stoichiometrically precise and generalized synthetic procedure involving ambient conditions for the preparation of transition metal–polychalcogenido complexes with N-/O-donor ligands may be considered as an interesting problem to be pursued.…”