Telluroureas and derived transition metal complexes: the crystal and molecular structure of [Cr(CO)₅{TeCN(Et)CH₂CH₂NEt}]

Formation of [(CnC1imTe)4Hg]2+ (n = 6, 8) upon in‐situ Generation of Dialkylimidazole‐2‐Tellurones in Ionic Liquids at Room Temperature

“…The Hg-Te-C angles in 1 cover a range of 92.51(29)-102.02(30)°, in good agreement with the respective angle in [(C 2 C 2 H 2 imTe)Cr(CO) 5 ] [96.14(1)°]. [17] The tetrafluoroborate salt of 2 crystallizes in the monoclinic space group P2 1 /n with four formula units per unit cell. Although it is not isostructural to 1[BF 4 ] 2 , the structure of the cationic complex is analog.…”

“…In this case however, the crystals of 1 [BF 4 ] 2 and 2 [BF 4 ] 2 were found to be relatively stable compared to tellurido mercurates, and only decomposed after several days in paratone oil under ambient conditions. To the best of our knowledge, [(C 2 C 2 H 2 imTe)Cr(CO) 5 ] is the only metal complex featuring a tellurone ligand so far . Similar complexes of transition metal cations coordinated tetrahedrally by four monodentate chalcogenone ligands have so far only been reported for the lighter homologs S and Se , .…”

Telluroamides and selenoamides: Complexes with chromium, molybdenum, and tungsten pentacarbonyls

“…Te (1) . This is the same as in the cases of a telluroketone tungsten complex [15] and a tellurourea chromium complex [16], in which the trans C-O bond is longer than the cis C-O bonds. The Cr-Te bond of 2.701 (2) Å is longer than the 2.556 Å covalent bond distance estimated from the Pauling values [32].…”

“…Only few crystal structures of metal complexes of telluroaldehydes [11], telluroketones [15], and telluroureas [16] have been reported. In the present investigation, the structural changes between free and coordinated tellurocarbonyls have been studied.…”

“…Due to the difficulty in their preparation, the ligand properties of tellurocarbonyls have not been well explored. A few metal complexes in which telluroaldehydes [7][8][9][10][11][12], telluroketones [13][14][15], and telluroureas [16,17] function as ligands have been reported. To date, however, no example in which a telluroamide functions as a ligand has appeared in the literature.…”