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Metal Complexes of the Neutral Borane Adduct B2H4.2P(CH3)3 Sir:Bis(trimethylphosphine)-diborane(4) (I) reacted with zinc chloride and gave a complex with the formula 02• 2 4• 2P(CH3)3. Shown in Figure 1 is the structure of the complex as determined by single-crystal X-ray analysis.1 I is coordinated to zinc through two hydrogen bridge bonds. Earlier, the formation of the triborane cation B3H6*2P(CH3)3+ was reported from this laboratory.2 The cation was considered to be the result of the coordination of B2H4-2P(CH3)3 to the cationic species BH2+. This formalism of B2H4-2P(CH3)3 coordination was extended to that involving metals as the coordination centers and thus led to the isolation and char-