RESUMO
Syntheses of manganese(i)-based dinuclear metallacycles have been accomplished under facile one-pot reaction conditions at room temperature. Self-assembly of four components has resulted in the formation of M2L2-type metallacycles [Mn(CO)3Br(µ-NLN)]2 (1-5) using pentacarbonylbromomanganese as the metal precursor and flexible ligands such as 1,2-bis(4-pyridyl)ethane (bpa), 1,2-bis(4-pyridyl)propane (bpp), 1,2-ethanediyl di-4-pyridine carboxylate (edp), 1,4-butanediyl di-4-pyridine carboxylate (budp), and 1,6-hexanediyl di-4-pyridine carboxylate (hedp) as linkers. The metallacycles have been characterized on the basis of IR, NMR, UV-vis, and ESI-mass spectroscopic techniques and single-crystal X-ray diffraction methods. The host capability of the metallacycles has been demonstrated using single-crystal X-ray crystallography.
RESUMO
A new series of thiolato-bridged manganese(I)-based supramolecular rectangles have been achieved by three-precursor self-assembly of Mn2(CO)10, diaryl disulfides (RSSR), and linear ditopic azine ligands (L) [L = pyrazine (pz), 4,4'-bipyridine (bpy), and trans-1,2-bis(4-pyridyl)ethylene (bpe)] using a one-pot synthetic strategy. Oxidative addition of RSSR (diphenyl disulfide and p-tolyl disulfide) to manganese decacarbonyl in the presence of rigid bidentate ligands (L) afforded metallarectangles of the general formula [{(CO)3Mn(µ-SR)2Mn(CO)3}2(µ-L)2] (1-6). Compounds 1-6 were characterized using elemental analyses and NMR, IR, and UV-vis absorption spectroscopic techniques. The molecular structures of metallarectangles 1, 3, and 5 were elucidated by single-crystal X-ray diffraction methods. The guest binding ability of 3 and 5 has been investigated with two aromatic guests using electronic absorption and fluorescence emission spectroscopy, and the results revealed a strong binding interaction between host-guest species.
