Abstract
Two equivalents of K[Cp′] (Cp′=C 5( i-Pr) 3H 2, C 5( i-Pr) 4H, C 5( t-Bu) 2H 3) react with CrCl 2 in THF to give the corresponding chromocenes, Cp′ 2Cr, in good yield. Despite the presence of bulky substituents on the rings that could affect their properties, the complexes are extremely air- and moisture-sensitive, and possess a low-spin ground state. The low-spin paramagnetic nature of each chromocene was confirmed by magnetic susceptibility measurements. The solid-state structure of [C 5( i-Pr) 3H 2] 2Cr was obtained using single crystal X-ray analysis. It displays rigorously parallel rings, with an average Cr–C(ring) distance of 2.17(1)Å; the chromium resides on a crystallographically imposed inversion center. The orientation of the isopropyl groups minimizes unfavorable steric interactions between the rings.
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