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Structure and Color of Substituted Pentaphenylbismuth
Author(s) -
Schmuck Arno,
Seppelt Konrad,
Pyykkö Pekka
Publication year - 1990
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199002131
Subject(s) - octahedron , electromagnetic shielding , electron , excitation , trigonal bipyramidal molecular geometry , square (algebra) , crystallography , homo/lumo , chemistry , photochemistry , physics , crystal structure , mathematics , geometry , molecule , quantum mechanics , organic chemistry
The square‐pyramidal structure is one reason for the intense color of pen‐taphenylbismuth and many of its derivatives, such as 1 . The easy electronic excitation is made possible, in this case, by a low‐lying LUMO, which is oriented toward the sixth coordination site of the octahedron. Noteworthy are the lack of shielding by the 4f electrons and the relativistic effects. The trigonal‐bipyramidal derivative 2 is orange instead of violet.