Synthesis and structural characterization of the telluroargentate [PPh4]2[NEt4][AgTe7] and telluromercurate [PPh4]2[HgTe7] compounds containing the unprecedented .eta.3-Te74- polytelluride anion

Abstract

While the chemistry of sulfidometalates and selenometalates has afforded many amazing species, for example [ReAiS^]4"1 and [V2Sei3]2-,2 the bonding in these species is conventional, consisting of liganded Q"2~m oieties (Q = S, Se; > 1). Despite the paucity of known species, it is the chemistry of the tellurometalates that appears to harbor the most unconventional bonding arrangements. Thus, [AuTe?]3-can be thought of as possessing an r¡3 456-Te¡*~ligand as well as an jj'-Tepligand,3 neither of which has sulfur or selenium counterparts, while the bonding arrangement in the [NbTeio]3-anion defies description.4 We now describe two new anions, [AgTe?]3-and [HgTe7]2-, each of which consists of a metal center coordinated by a single tp-Tej4"" ligand, a previously unknown ligand with no sulfur or selenium analogues.

Solid State Polyselenides and Polytellurides: A Large Variety of Se–Se and Te–Te Interactions

“…The largest representative of the series Q n 4– currently known is Te 7 4– , coordinated to an Ag + or Hg 2+ cation via the central Te and the two terminal Te atoms [54,55]. The Te 7 4– anion can formally be constructed from adding two neutral Te atoms to a cis -Te 5 4– .…”

Ternary and quaternary chalcogenides of Group IB elements

“…Based on the charge of the [AgTe 7 ] 37 anion, the charge of 74 should be assigned to the ligand and the ligand can be considered as Z 3 -Te 4À 7 . The Te(4)7Te (5) and Te(4)7Te(3) bond lengths (0.2866 and 0.3230 nm, respectively) are substantially different, whereas this difference in the corresponding bonds in the analogous [HgTe 7 ] 27 complex is insignificant (0.3050 and 0.2997 nm, respectively 53 ). Therefore, the nature of the bonds in the new polytelluride Z 3 -Te 4À 7 ligand is still unknown.…”

“…The structure of the analogous silver complex [AgTe 7 ] 37 isolated as the (Ph 4 P) 2 (Et 4 N)[AgTe 7 ] salt (Fig. 11 b) 53,54 differs from that of the [AuTe 7 ] 37 anion. In this silver complex, the Ag + ion adopts a trigonal coordination.…”

“…Tel. (38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57) 245 73 52 in this system. In 1994, Chinese researchers 24 at the National Laboratory of Superconductivity synthesised a series of oxyselenides LnCuSeO (Ln = La, Sm, Gd or Y).…”

“…Svobody 4, 310077 Kharkov, Ukraine. Fax (38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57) 247 18 16. Tel.…”