(a) NMR spectroscopic data for [HA1(BH4)2J„ are consistent with the compound existing in two forms in solution. One form is probably a dimer and the other, a higher oligomer. Each spccics possesses one boron environment, and in the nB NMR spectrum, each species exhibits a binomial quintet. The chemical shift of the signal for each species in the 2/AI NMR spectrum suggests an octahedral environment for the Al atom. Suggest a structure for the dimer |HA](BH4)2]2 which is consistent with these observations and comment on whether the data indicate a static or dynamic molecule,
(b) The elemental analysis for an adduct A is 15.2% 75.0% Cl, 4.2% C and 5.6% O. The 1 lB NMRspectrum of A contains two singlets (<5 —20.7 and +68.9 ppm) with relative integrals 1:3; the signal at 6 —20.7 ppm is characteristic of a B atom in a tetrahedral environment, while that at +68.9 ppm is consistent with trigonal planar boron. In the IR spectrum, there is a characteristic absorption at 2176 cm . Suggest an identity for A and draw its structure.
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