Cationic strontium hydride complexes supported by an NNNN-type macrocycle

A trinuclear strontium hydride [(Me(4)TACD)(3)Sr-3(mu(2)-H)(4)(thf)][B(C6H3-3,5-Me-2)(4)](2) (Me(4)TACD = 1,4,7,10-tetramethyltetraazacyclododecane) and a mixed calcium strontium hydride [(Me(4)TACD)(2)CaSr(mu-H)(2)(thf)][B(C6H3-3,5-Me-2)(4)](2) were isolated by hydrogenolysis of cationic benzyl precursors. A solution of [(Me(4)TACD)(2)CaSr(mu-H)(2)(thf)][B(C6H3-3,5-Me-2)(4)](2) shows hydride ligand exchange between calcium and strontium centers and higher affinity of the hydride ligand toward calcium.

Automated summary

Two different multinuclear metal hydrides were isolated in this study, and it was found that there is hydride ligand exchange between calcium and strontium centers, with a higher affinity of the hydride ligand toward calcium.