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Reversed Berry pseudorotation (see picture) results in a severely distorted trigonal-bipyramidal geometry with C2v symmetry in the paramagnetic (d1) anion [Ti(C6F5)5]2−, which was obtained by the low-temperature reaction of TiCl4⋅x Et2O and LiC6F5 and is the first homoleptic organometallic compound containing a [TiR5]2− unit.
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Alonso et al. (2004) studied this question.
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