Methyl group rotation and bonding in solid hexamethyldialuminum, Al2(CH3)6

摘要

Continuous wave proton second moment and line shape studies of the solid state trimethylaluminum dimer, Al2(CH3)6, have shown that all the methyl groups in this compound rotate about their triad axes at 77deg;thinsp;K. An activation energy of 840plusmn;40 cal/mole was found for this methyl group rotational process from the temperature dependent static and rotating frame spinndash;lattice relaxation times (T1and T1rgr;, respectively) studies. These observations tend to support the twohyphen;electron threehyphen;center Alndash;Cndash;Al bond model for the bridging methyl group carbons.