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Suspending crystals of bis(pentafluorophenyl)mercury [Hg(C 6 F 5 ) 2 ] ( 1a ) in a saturated  n -hexane solution for a prolonged period results in transformation into the new polymorph [Hg(C 6 F 5 ) 2 ] ( 1 b ) monoclinic  P 2 1 / n ,  a  = 11.7060(3) Å,  b  = 7.8531(2) Å,  c  = 13.5429(4) Å,  β  = 107.247(3)°,  V  = 1189.00(6) Å 3 . The C-Hg-C angle in  1 b  is 177.10(11)° and the pentafluorophenyl rings are rotated 74.6(1)° to each other in comparison to  1a , the form known for 50+ years, which has a rotation angle of 58.0(2)°. Polymorph  1 b  could also be obtained by crystallization from chloroform, or a CHCl 3 / n -hexane (1:1) mixture at −20 °C, or by seeding with a crystal of  1 b . Theoretical calculations suggest that the barrier to rotation is low.

A new twist on an old molecule: a rotameric isomer of bis(pentafluorophenyl)mercury