STRUCTURES OF STERICALLY OVERCROWDED AND CHARGE-PERTURBED MOLECULES .12. TETRAKIS(DIMETHYLAMINO)ETHENE - AN EXTREMELY ELECTRON-RICH MOLECULE WITH UNUSUAL STRUCTURE BOTH IN THE CRYSTAL AND IN THE GAS-PHASE

An unusual and chiral molecular framework characterizes the crystal structure of the air‐sensitive title coumpound 1, which solidifies at 273 K. The molecular fragments on either side of the stretched CC bond (138 pm) are twisted by 28° relative to each other (picture bottom right). Even in the gas phase 1 shows an unusual molecular structure, dictated by steric congestion. The four nitrogen electron pairs of the substantially flattened dimethylamino substituents are bent out of the optima1 orientation for π interaction (the torsion angle ω(CC‐NC2) is 55o. (Figure Presented.) Copyright © 1991 by VCH Verlagsgesellschaft mbH, Germany