We report the first disubstituted hetero-ten-vertex closo cluster [(CrGe_(9))Cr_(2)(CO)_(13)]^(4-)with three adjacent Cr(CO);units adopting both η^(5) and η^(1) coordination modes,which was synthesized through the r...We report the first disubstituted hetero-ten-vertex closo cluster [(CrGe_(9))Cr_(2)(CO)_(13)]^(4-)with three adjacent Cr(CO);units adopting both η^(5) and η^(1) coordination modes,which was synthesized through the reaction of "KGe;" with(MeCN)_(3)Cr(CO)_(4)and Cr(CO)_(6)in ethylenediamine(en) solution.In contrast to the η^(1)-Cr atoms forming localized two-center two-elelctron(2 c-2 e) Cr-Ge bonds,the hetero atom η^(5)-Cr exhibits versatile bonding mechanisms including three 5 c-2 e and five 8 c-2 e delocalized bonds which account for Hückel aromaticity.Intricate multi-center bonding patterns delineate the multiple local σ-aromatic characters of the title cluster displaying explicit spherical aromaticity.展开更多
基金supported by the National Natural Science Foundation of China (No. 21971118 to Z.M. Sun and21573179 to J. Zhu)the Natural Science Foundation of Tianjin City (No. 20JCYBJC01560)。
文摘We report the first disubstituted hetero-ten-vertex closo cluster [(CrGe_(9))Cr_(2)(CO)_(13)]^(4-)with three adjacent Cr(CO);units adopting both η^(5) and η^(1) coordination modes,which was synthesized through the reaction of "KGe;" with(MeCN)_(3)Cr(CO)_(4)and Cr(CO)_(6)in ethylenediamine(en) solution.In contrast to the η^(1)-Cr atoms forming localized two-center two-elelctron(2 c-2 e) Cr-Ge bonds,the hetero atom η^(5)-Cr exhibits versatile bonding mechanisms including three 5 c-2 e and five 8 c-2 e delocalized bonds which account for Hückel aromaticity.Intricate multi-center bonding patterns delineate the multiple local σ-aromatic characters of the title cluster displaying explicit spherical aromaticity.
