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Cationic influence in anionic organoaluminum chemistry. Synthesis and structure of dimethylthallium isothio-cyanatotrimethylaluminate

1974; Elsevier BV; Volume: 64; Issue: 1 Linguagem: Inglês

10.1016/s0022-328x(00)93029-8

1872-8561

S. K. SEALE, Jerry L. Atwood,

Thallium and Germanium Studies

The reaction of TISCN with Al(CH3)3 has been found to yield [(CH3)2Tl] [Al(CH3)3NCS]. The crystal structure of dimethylthallium isothio-cyanatotrimethylaluminate has been determined from three-dimensional X-ray data measured by counter methods. The compound crystallizes in the monoclinic space group C2/m with cell dimensions a = 16.031(8), b = 12.447(6), c = 6.410(3) Å, β = 106.17(5)°, and ρcalc = 1.99 g/cm3 for Z = 4. Least-squares refinement has given a conventional weighted R factor of 0.073 for 587 independent observed reflections. The anion lies in a crystallographic mirror plane, and the thallium atom resides on a two-fold axis. The coordination requirements of the thallium atom are believed to be responsible for the stabilization of the N-bonding mode of the isothiocyanate group in the anion.