Ta(C10H1 5 )i(OH)(CH 3 )][B(OH)(C 6 F 5 h], Mr= 1001.63, monoclinic, P2 1 /n, a= 12.217 (2), b = 16.848 (6), c = 18.834 (3) A, /3 = 100.37 (2), v = 3813.l (15) A 3 , Z = 4, Dx = 1.75 g cm-3 , .A{Mo Ka) = 0.71073 A, = 29.52 cm-1 , F(OOO) = 1972, room temperature, R = 0.031 for 3534 reflections with Fa 2 > 3u(F/). The Ta cation has the expected geometry, with Ta-C and Ta-0 distances 2.211 (6) and
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Schaefer et al. (1993) studied this question.