Cationic strontium hydride complexes supported by an NNNN-type macrocycle

Abstract

A trinuclear strontium hydride [(Me₄TACD)₃Sr₃(μ₂-H)₄(thf)][B(C₆H₃-3,5-Me₂)₄]₂ (Me₄TACD = 1,4,7,10-tetramethyltetraazacyclododecane) and a mixed calcium strontium hydride [(Me₄TACD)₂CaSr(μ-H)₂(thf)][B(C₆H₃-3,5-Me₂)₄]₂ were isolated by hydrogenolysis of cationic benzyl precursors. A solution of [(Me₄TACD)₂CaSr(μ-H)₂(thf)][B(C₆H₃-3,5-Me₂)₄]₂ shows hydride ligand exchange between calcium and strontium centers and higher affinity of the hydride ligand toward calcium.