INTERACTIONS IN CRYSTALS .78. THE STRUCTURE OF NAKED 9,10-BIS(TRIMETHYLSILYL)ANTHRACENE RADICAL-ANION

Reduction of 9,10-bis(trimethylsilyl)anthracene at a sodium metal mirr or under aprotic conditions and argon yields its radical anion, which is characterized by its ESR multiplet signal pattern. Crystallization from dimethoxyethane solution under aprotic conditions yields brown pr isms of its solvent-separated radical anion salt. The structure, deter mined in a 130 K cold N-2 flow, is discussed in comparison with the an alogously folded structure of the neutral molecule, literature example s and results of MNDO calculations.