Bis(η-tert-butylcyclopentadienyl)hydridoniobium Ditelluride, a Convenient Reagent for the Synthesis of Polynuclear Metal Telluride Complexes

Synthesis and structural characterization of the neutral pentagonal-prismatic Co11Te7(CO)10 cluster in a matrix of [Cp′4Nb2(CH3Te)Te]I (Cp′ = tBuC5H4)

“…2). This arrangement is similar to that in Cp′ 4 Nb 2 Te 2 [10,14] and [Cp′ 4 Nb 2 (CH 3 Te) 2 ]I 2 [10] and similarities are also observed for the metric parameters (Table 1). Two methyl groups (C29) are fixed at the Te bridges in a trans position, but with an occupancy of 50% for each of the methyl groups.…”

“…The 1 H NMR spectrum of 5 is not clear-cut because of the low proton concentration of the sample, caused by the high molar mass of 5 and its low solubility. Resonances at d = 1.46 ppm (tBu) and between 4.33 and 6.30 (multiplets of aromatic hydrogens) resemble those of [Cp′ 4 Nb 2 Te 2 CH 3 ]I, a compound which forms on methylation of Cp′ 4 Nb 2 Te 2 [10].…”

“…The crystal structure of 5 consists of two molecular units in the triclinic cell and each molecular unit contains one [Co 11 Te 7 (CO) 10 ] polyhedron, one [Cp′ 4 Nb 2 Te 2 CH 3 ] + ion, two I -ions (50% disordered each) and one CH 2 Cl 2 molecule (Fig. 1).…”

“…As a result we found the surprising formation of the neutral cluster [Co 11 Te 7 (CO) 10 ], associated with and probably stabilized by the salt [Cp′ 4 Nb 2 (CH 3 Te)Te]I both in solution and in the solid state.…”

“…In this context we were interested to cleave the Te-Te bond in Cp′ 2 Nb(g 2 -Te 2 )H (Cp′ = tBuC 5 H 4 ) (1) [10] by reductive means. In a first attempt reaction of 1 with CH 3 Li gave a red-violet, very reactive product of still unknown nature [11].…”