1,8-Di(quinol-2-yl)octa-1,7-diyne and 1,8-di(phenanthren-9-yl)octa-1,7-diyne were synthesised by conventional and microwaveassisted methods in good yields. Microwave irradiation enhances the rate of these reactions. Photophysical properties of these derivatives were also evaluated, and it was found that 1,8-di(phenanthren-9-yl)octa-1,7-diyne displays a higher fluorescence quantum yield than 1,8-di(quinol-2-yl)octa-1,7-diyne. The molecular structures of 1,8-di(quinol-2-yl)octa-1,7-diyne and 1,8-di(phenanthren-9-yl)octa-1,7-diyne were established by single-crystal X-ray diffraction studies.
A variety of dirhenium carbonyl complexes containing π-conjugated phosphole derivatives were obtained from reaction of [Re 2 (CO) 8 (CH 3 CN) 2 ] with each of the following phospholes: 2,5-bis(2-thienyl)-1-phenylphosphole (btpp), 2,5-bis(2-pyridyl)-1phenylphosphole (bpypp) and 1,2,5-triphenylphosphole (tpp). The π-conjugated phospholes were found to behave as two-, four-or six-electron donor ligands via σ or σ-π interactions with the metal centers, presenting bridging or chelating coordination modes as determined by spectroscopic methods and single crystal X-ray diffraction analysis. Metal-metal bond cleavage was evidenced when btpp was used, leading to a mono-substituted mononuclear complex. Variable-temperature 1 H NMR studies for σ,π-complexes showed a fluxional behavior due to the restricted rotation around the P-C and C-C bonds of the 1,2,5trisubstituted phosphole ring.
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