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Solid-state activation energies for fluxional behavior in three aryl-subsituted (pentachlorocyclo-pentadienyl)phenylmercury compounds RHgC 5  Cl 5  : (pentachlorocyclopentadienyl)(pentamethyl-phenyl)mercury (I, R = C 6  (CH 3 ) 5  , E act  = 19.3 kJ mol -1 ); (pentachlorocyclopentadienyl)(2,4,6-tris-(terf-butyl)phenyl)mercury (II, R = 2,4,6-C 6 H 2 (C(CH 3 ) 3 ) 3  , E act  = 59.5 kJ mol -1 ); and (pentachloro-cyclopentadienyl)(phenyl)mercury (III, R = C 6 H 5  , E  act  = 62.8 kJ mol -1 ) have beeb obtained from  35 Cl NQR spin-lattice relaxation-time measurements. II has also been shown to be fluxional in solution by  13 C NMR spectra. II was prepared by an exchange reaction between Hg(C 5 Cl 5 ) 2  and Hg(2,4,6-C 6 H 2 (C(CH 3 ) 3 ) 3 ) 2  , which reacted readily despite the great steric hindrance present in the latter reagent.

Activation Energies for Fluxional Behavior in Aryl(pentachlorocyclopentadienyl)mercurials, η 1 -C 5 Cl 5 HgR, from 35 Cl NQR Relaxation Times