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Metall‐π‐Komplexe von Benzolderivaten, 36. Zur Kenntnis der Struktur von μ(η 6 :η 6 ‐Biphenyl)bis[(η 6 ‐benzol)metall]‐Komplexen in starrer Lösung und im Kristall
Author(s) -
Elschenbroich Christoph,
Heck Jürgen,
Massa Werner,
Birkhahn Matthias
Publication year - 1990
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19901231214
Subject(s) - chemistry , crystallography , biphenyl , dication , dihedral angle , x ray crystallography , diradical , crystal structure , benzene , metal , molecule , stereochemistry , diffraction , excited state , physics , hydrogen bond , organic chemistry , singlet state , nuclear physics , optics
Metal π‐Complexes of Benzene Derivatives, 36. — The Structure of μ(η 6 :η 6 ‐Biphenyl)bis[(η 6 ‐benzene)metal] Complexes in Rigid Solution and in the Crystalline State For μ(η 6 :η 6 ‐C 6 H 5 C 6 H 5 )[η 6 ‐C 6 H 6 )Cr] 2 ( 2 ) an antiperiplanar conformation has been established by means of X‐ray diffraction. Two (C 6 H 6 )Cr units coordinate to planar bridging biphenyl. This configuration differs from that of the diradical dication 2 d⊕ d⊕ in rigid solution. According to the zero‐field splitting parameter D in the EPR spectrum, 2 d⊕ d⊕ adopts a synclinal conformation, the half‐sandwich fragments coordinating to twisted biphenyl (dihedral angle α ≈ 60°).