Self-Assembly of Manganese(I)-Based
Molecular Squares:
Synthesis and Spectroscopic and Structural Characterization
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Abstract
Syntheses of manganese(I)-based molecular squares have
been accomplished
in facile one-pot reaction conditions at room temperature. Self-assembly
of eight components has resulted in the formation of M<sub>4</sub>L<sub>4</sub>-type metallacyclophanes [Mn(CO)<sub>3</sub>Br(μ-L)]<sub>4</sub> (<b>1</b>–<b>3</b>) using pentacarbonylbromomanganese
as metal precursor and rigid azine ligands such as pyrazine, 4,4′-bipyridine,
and <i>trans</i>-1,2-bis(4-pyridyl)ethylene, respectively,
as bridging ligands. The metallacyclophanes have been characterized
on the basis of IR, NMR, and UV–vis spectroscopic techniques
and single-crystal X-ray diffraction methods
