Preparation, Structure, and Density Functional Calculation of the Solvent-Separated Ion Pair [(H.sub.5./sub.C.sub.2./sub.)Al(OC.sub.6./sub.H.sub.5./sub.).sub.3./sub..sup.-./sup....Li.sup.+./sup.....sup.-./sup.(H.sub.5./sub.C.sub.6./sub.O).sub.3./sub.Al(C.sub.4./sub.H.sub.9./sub.)].sup.-./sup.[Li.sup.+./sup.(DME).sub.3./sub.]