Ruthenium–Cobalt Bimetallic Supramolecular Cages via a Less Symmetric Tetrapyridyl Metalloligand and the Effect of Spacer Units
摘要:
The self-assembly of C-s-symmetric tetrapyridyl cobalt metalloligand 2 with three half-sandwich diruthenium acceptors, 3-5, led to the formation of A(4)D(2) (A = acceptor, D = donor) metallacages 6-8, as shown by ESI mass spectrometry, NMR spectroscopy, and X-ray crystallography. The solid-state structures of 6-8 revealed that the length of the acceptor unit greatly influences the molecular packing of these metallacages. Hence, in the solid state, 6-8 can be considered to have waterwheel-shaped, tweezer-shaped, and butterfly-like architectures, respectively.
Ruthenium–Cobalt Bimetallic Supramolecular Cages via a Less Symmetric Tetrapyridyl Metalloligand and the Effect of Spacer Units
摘要:
The self-assembly of C-s-symmetric tetrapyridyl cobalt metalloligand 2 with three half-sandwich diruthenium acceptors, 3-5, led to the formation of A(4)D(2) (A = acceptor, D = donor) metallacages 6-8, as shown by ESI mass spectrometry, NMR spectroscopy, and X-ray crystallography. The solid-state structures of 6-8 revealed that the length of the acceptor unit greatly influences the molecular packing of these metallacages. Hence, in the solid state, 6-8 can be considered to have waterwheel-shaped, tweezer-shaped, and butterfly-like architectures, respectively.
Microwave-Assisted Synthesis of Cyclopentadienyl–Cobalt Sandwich Complexes from Diaryl Acetylenes
作者:Emily M. Harcourt、Shifra R. Yonis、Daniel E. Lynch、Darren G. Hamilton
DOI:10.1021/om7011634
日期:2008.4.1
Sealed tube microwave dielectric heating of diaryl acetylenes with cyclopentadienyl cobalt dicarbonyl at elevated temperature in p-xylene provides access to metallocenes in both the cyclobutadiene (Ar(4)C(4)CoCp) and cyclopentadienone (Ar(4)C(4)(C=O)CoCp) families. When compared with the traditional thermal approach, the current method offers dramatically reduced reaction times and, especially with respect to cyclopentadienone complexes, increased yields. In the case of an especially bulky diarylacetylene the microwave approach allows access to a complex that cannot be readily obtained under traditional thermal conditions. An initial microwave-promoted Sonogashira coupling may be employed for in situ generation of the diarylacetylene, although lower yields of the metallocene complexes are ultimately obtained.
Harrison, Robin M.; Brotin, Thierry; Noll, Bruce C., Organometallics, 1997, vol. 16, p. 3401 - 3412
作者:Harrison, Robin M.、Brotin, Thierry、Noll, Bruce C.、Michl, Josef