Zinc hydride cation [ZnH](+) supported by TMPDA (TMPDA = N,N,N ',N '-tetramethylpropane-1,3-diamine)

Selective protonolysis of polymeric zinc dihydride [ZnH2](n) by the conjugate acid of the chelating N,N-donor TMPDA (TMPDA = N,N,N',N'-tetramethylpropane-1,3-diamine) [(TMPDA)H)][B(3,5-(CF3)(2)-C6H3)(4)] in THF gave the molecular zinc hydride cation [(TMPDA)ZnH(thf)][B(3,5-(CF3)(2)-C6H3)(4)] that is stable in THF but crystallized as the dimer [(TMPDA)(2)Zn-2(mu-H)(2)][B(3,5-(CF3)(2)-C6H3)(4)](2) from CH2Cl2/n-pentane. The protonolysis with half equivalent of the conjugate acid or the reaction of isolated [(TMPDA)ZnH (thf)][B(3,5-(CF3)(2)-C6H3)(4)] with one equivalent of zinc dihydride in THF gave the molecular dizinc trihydride cation [(TMPDA)(2)Zn2H2(mu-H)][B(3,5-(CF3)(2)-C6H3)(4)]. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

Selective protonolysis of polymeric zinc dihydride using the conjugate acid of TMPDA yielded stable molecular zinc hydride cations, with further reactions forming dimeric zinc hydride or dizinc trihydride cations.