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Hepta‐ and Octacoordinate Boron in Molecular Wheels of Eight‐ and Nine‐Atom Boron Clusters: Observation and Confirmation
Author(s) -
Zhai HuaJin,
Alexandrova Anastassia N.,
Birch K. Alexander,
Boldyrev Alexander I.,
Wang LaiSheng
Publication year - 2003
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200351874
Subject(s) - boron , atom (system on chip) , materials science , crystallography , chemistry , nanotechnology , computer science , organic chemistry , embedded system
Two types of aromaticity : Experimental and theoretical evidence shows that eight‐ and nine‐atom boron clusters are perfectly planar molecular wheels, with a hepta‐ or octacoordinated central boron atom, respectively (see picture, B green). The radii of the miniature molecular wheels are found to be 1.8 and 2.0 Å. Analyses of their chemical bonding reveal that they possess double (σ and π) aromaticity, which is responsible for the wheel structures and the extreme coordination environments.