Novel methadone salt containing a discrete, square-planar CuCl42– anion: X-ray crystal and molecular structure of bis(1-methyl-4-oxo-3,3-diphenylhexyldimethylammonium) tetrachlorocuprate(II)

Abstract

The crystal and molecular structure of a novel, dark green methadone salt, bis-(1-methyl-4-oxo-3,3-diphenylhexyldimethylammonium)tetrachlorocuprate-(II)(1), which has a high energy d–d electronic absorption maximum at 15, 700 cm^–1 in the solid state, and lacks a thermochromic transition, is reported; crystal packing forces, and not hydrogen bonding, are responsible for the discrete, square-planar geometry about copper(II) in the CuCl₄^2– anion.