Self-Assembly of Manganese(I)-BasedMolecular Squares:Synthesis and Spectroscopic and Structural Characterization.

Syntheses of manganese(I)-based molecular squares havebeen accomplishedin facile one-pot reaction conditions at room temperature. Self-assemblyof eight components has resulted in the formation of M4L4-type metallacyclophanes [Mn(CO)3Br(μ-L)]4(1–3) using pentacarbonylbromomanganeseas metal precursor and rigid azine ligands such as pyrazine, 4,4′-bipyridine,and trans-1,2-bis(4-pyridyl)ethylene, respectively,as bridging ligands. The metallacyclophanes have been characterizedon the basis of IR, NMR, and UV–vis spectroscopic techniquesand single-crystal X-ray diffraction methods. [ABSTRACT FROM AUTHOR]