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Two new examples of very short thallium–transition metal contacts: Tl3Ag3Sb2S6 and Tl3Ag3As2S6

“…First of all, Tl-Tl contacts shorter than 3.92Å (i.e. 2 × r vdW (Tl) [28]) are found in many classes of compounds, as simple inorganic salts, e.g., TlF (the shortest Tl-Tl distance: 2.59Å) [29] and TlNO 3 (Tl-Tl: 3.05Å) [30], some organometallics, e.g., Tl 4 (OR) 4 , R = Me, Et, n-Pr (Tl-Tl: 3.83Å) [31], some intermetallics, e.g., Li 5 Tl 2 (Tl-Tl: 3.01Å) [32] and KTl (Tl-Tl: 3.06-3.08Å) [33], as well as in many coordination compounds, e.g., [As(C 6 H 5 ) 4 ][Tl 2 {μ-Mn(CO) 4 (μ-H)Mn 3 (CO 12 } 2 ] (Tl-Tl 3.632Å) [34] and a series of pyrazolate complexes (Tl-Tl: 3.53Å) [35].…”

“…2 is in equilibrium with Ag 3 TlS 3 , Ag 35 Tl 5 S 20 -Ag 34 Tl 6 S 20 (ss), lorandite, proustite, ellisite, pyrargyrite, Ag 9 Tl 3 As 4 S 12 and Tl 3 Ag 3 Sb 2 S 6 . 1 is in equilibrium with Ag 3 TlS 3 , Ag 35 Tl 5 S 20 -Ag 34 Tl 6 S 20 (ss), weissbergite, proustite, "stibioellisite" and Tl 3 Ag 3 As 2 S 6 (Figs. 1 and 2).…”

Heterocyclopentadienyl Complexes of Group-3 Metals

“…The pyrazolyl ligands generally have the cis configuration, except in [(η 2 -Dppz) 2 Eu(DME) 2 ] in which they are trans. [46] In the case of Yb and with THF as donor ligand, there is only one coordinated THF, and both coordination types E and F are present in [(η 2 -Dtpz) 2 (µ:η 2 -Dtpz) 2 Yb 2 -(THF) 2 ] [47] (46). Dmpz moieties display the type F (planar) coordination mode.…”

Dimeric samarium(III) alkoxides bearing N2O2 tetradentate Schiff bases and their utility for the catalytic epoxidation of trans-chalcone

“…The Sm(2)Á Á ÁC(41) and Sm(2)Á Á ÁC(46) interactions ( Fig. 2 (b)) in 3 and 4 are 3.12-3.30 Å and are in good agreement with previously observed Ln Á Á Á arene p interactions [12]. In both complexes, the Sm-O bond lengths about Sm(2) generally tend to be slightly longer than the corresponding Sm-O bond lengths for Sm(1) and those for 4 tend to be slightly longer than the corresponding bonds in 3.…”