The crystal and molecular structure of a new polymorph of carbonylhydridotris(triphenylphosphine)rhodium(I) having a Rh-H stretching absorption at 2013 cm?1

Abstract

A new polymorph of HRh(CO)(PPh3)3, with a υRh-H of 2013 cm−1, has been isolated by crystallization fromtert-butyl methyl ether/tetrahydrofuran. The crystals are monoclinic (space groupP21/n), witha=21.48(2) A,b=14.92(2)A,c=14.52(1)A,β=107.95(8)°. A finalR value of 0.065 was obtained using 2243 reflections which hadInet>2.5σ(Inet). The structure of the new polymorph has a similar coordination geometry to the known polymorph, but a different conformation of one of the phenyl rings.