The tmbp Dianion in the Contact Ion Pair [(tmbp)Na(2)(dme)(1.5)](n) and in the Solvent-Separated Ion Pair [tmbp][(2.2.1)Li](2) This work was supported by the CNRS and the Ecole Polytechnique; tmbp=4,4',5,5'-tetramethyl-2,2'-biphosphinine,DME=1,2-dimethoxyethane |