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Synthesis and Characterization of Novel Guanidine Ligands Featuring Biphenyl or Binaphthyl Backbones
Author(s) -
Maronna Astrid,
Bindewald Elvira,
Kaifer Elisabeth,
Wadepohl Hubert,
Himmel HansJörg
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000981
Subject(s) - chemistry , biphenyl , raman spectroscopy , characterization (materials science) , solid state , transition metal , guanidine , single crystal , catalysis , crystallography , crystal structure , coordination complex , metal , stereochemistry , combinatorial chemistry , organic chemistry , nanotechnology , physics , materials science , optics
In this paper we report on the synthesis and characterization of several new 2,2′‐bisguanidino‐1,1′‐biphenyl and ‐binaphthyl ligands as well as the electron donor 3,3′,4,4′‐tetrakis(tetramethylguanidino)‐1,1′‐biphenyl. Chiral bisguanidine ligands were prepared with binaphthyl backbones. The solid‐state structures were analysed by single‐crystal X‐ray diffraction. UV/Vis and Raman spectra provided a qualitative insight into the rotational barriers in solution and in the solid state. Finally, late‐transition‐metal complexes of two of these ligands were prepared. These complexes prefer a κ 1 rather than a κ 2 coordination mode. The discussion of the experimental results is complemented by quantum chemical (DFT) calculations. Finally, we report on the first catalytic test reactions.