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Cover Picture (Angew. Chem. Int. Ed. Engl. 7/1991)
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199107231
Subject(s) - cover (algebra) , crystallography , combinatorics , polyhedron , shell (structure) , art history , computer science , chemistry , materials science , art , mathematics , engineering , mechanical engineering , composite material
The title picture shows the shell‐like structure of a new complex intermetallic compound (LiMgAl 2 ). The picture brings to mind totally different objects like viruses, radiolarians, and space stations. The light blue surface consists of 12 five‐ and six‐membered rings constructed from 76 aluminum atoms. The polygon with 76 corners is also a possible C 76 fullerene structure. (For a report by H. Schwarz et al. on the inclusion of helium within the cage formed by C 60 and C 70 , see p. 884). The bonds depicted in green link neighboring Al 76 polyhedrons in a three‐dimensional network. The perfect dual nature of the structure is shown by the red polyhedron inside Al 76 , which has 76 surfaces and 40 corners. The inner yellow shell is constructed of all three elements. R. Nesper et al. report on structures of this type, the new descriptions of their chemical bonds, general structural aspects, and the relationships to quasicrystals and other chemical classes of compounds on p. 789.