Bis(tetra-n-butylammonium) Bis(μ-1,1-dicyanoethene-2,2-diselenolato)dithallate(I) Acetone Solvate, [(C4H9)4N]2[Tl2{Se2C=C(CN)2}2].2(CH3)2CO

Tl2Ch22-(Ch = Se and/or Te) Anions: X-ray Crystal Structures and Raman Spectra of (2,2,2-crypt-K+)2Tl2Se22-and (2,2,2-crypt-K+)2Tl2Te22-and Solution77Se,203Tl, and205Tl NMR Spectroscopic and Theoretical Studies of Tl2Ch22-, In2Se2

“…The Tl−Se distance in Tl 2 Se 2 2- , 2.781(3) Å, is considerably shorter than the average Tl−Se distances observed in Tl(C 12 N 15 N 2 OSe) [3.112(4) Å] and in Tl 2 (Se 2 C 2 (CN) 2 ) 2 2- [3.143(4) Å] . The Tl−Te distance in Tl 2 Te 2 2- is 2.956(2) Å and is identical to the average bond distance [2.954(6) Å] observed in the previously characterized anion and is much shorter than those observed in the alloy phases TlTe [3.398(5)−3.648(3) Å] 26 and Tl 5 Te 3 [3.142(9)−3.596(4) Å]. , The transannular Tl···Tl distances in Tl 2 Se 2 2- [3.698(2) Å] and in Tl 2 Te 2 2- [3.798(2) Å] are longer than in thallium metal (3.408 Å) but are considerably shorter than those observed in the (C 6 H 5 ) 4 P + [4.047(1)−4.381(1) Å] and (C 2 H 5 ) 4 N + [4.381(1) Å] salts of the Tl 2 S 2 (S 3 ) 2 2- anion, which contains a planar Tl 2 S 2 ring.…”

Homopolynuclear TlI and Heteropolynuclear AuI–TlI Complexes with Organodiselone Ligands: Activation of Luminescence by Intermetallic Interactions

“…Thus, the crystal structure of 3 is formed by [Tl(L1)] + cations and [Au(C 6 Cl 5 ) 2 ] -anions joined together by an unsupported Au···Tl interaction, as shown in Figure 4. The Au-Tl distance of 2.9619 (8) [24,25a,25b,32-39] The Tl···Se bond lengths ( [29] and [AsPh 4 ] 2 [Tl 2 {Se 2 C=C(CN) 2 } 2 ] (3.108-3.162 Å), [30] whereas the second one compares well with most of the Tl-Se bond lengths noted. The environment at thallium is trigonal pyramidal with two positions occupied by the selenium donors from the ligand L1, and the third coordination site occupied by the anion [Au(C 6 Cl 5 ) 2 ]…”

“…2-[3.570(1) [29] and 3.547 Å [30] ] and also longer than the double of the van der Waals radius of thallium (3.92 Å), [23] which indicates the absence of any type of interaction between the metal atoms in 1. [a] Symmetry transformations used to generate equivalent atoms:…”