Transition-Metal Chemistry of Alkaline-Earth Elements: The Trisbenzene Complexes M(Bz)₃ (M=Sr, Ba).

ABSTRACT: We report the synthesis and spectroscopic identification of the trisbenzene complexes of strontium and barium M(Bz)₃ (M=Sr, Ba) in low-temperature Ne matrix. Both complexes are characterized by a D₃ symmetric structure involving three equivalent η⁶ -bound benzene ligands and a closed-shell singlet electronic ground state. The analysis of the electronic structure shows that the complexes exhibit metal-ligand bonds that are typical for transition metal compounds. The chemical bonds can be explained in terms of weak donation from the π MOs of benzene ligands into the vacant (n-1)d AOs of M and strong backdonation from the occupied (n-1)d AO of M into vacant π* MOs of benzene ligands. The metals in these 20-electron complexes have 18 effective valence electrons

SUBMITTER: Wang Q 

PROVIDER: S-EPMC6900055 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature