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Amide-Functionalized Chalcogen-Bridged Flexible Tetranuclear Rhenacycles: Synthesis, Characterization, Solvent Effect on the Structure, and Guest Binding

[Image: see text] The synthesis of flexible rhenium(I)-based amide-functionalized chalcogen-bridged tetranuclear metallacycles of general formula [{(CO)(3)Re(μ-ER)(2)Re(CO)(3)}(2)(μ-L)(2)] (1–8) was achieved by treating rhenium carbonyl with dialkyl/diaryl chalcogenide (RE–ER; E = S and Se) in the p...

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Detalles Bibliográficos
Autores principales: Karthikeyan, Muthuraman, Ramakrishna, Buthanapalli, Vellaiyadevan, Sivalingam, Divya, Dhanaraj, Manimaran, Bala.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641653/
https://www.ncbi.nlm.nih.gov/pubmed/31458582
http://dx.doi.org/10.1021/acsomega.7b02075
Descripción
Sumario:[Image: see text] The synthesis of flexible rhenium(I)-based amide-functionalized chalcogen-bridged tetranuclear metallacycles of general formula [{(CO)(3)Re(μ-ER)(2)Re(CO)(3)}(2)(μ-L)(2)] (1–8) was achieved by treating rhenium carbonyl with dialkyl/diaryl chalcogenide (RE–ER; E = S and Se) in the presence of ditopic flexible or semiflexible pyridyl ligand with amide functionality (L = N,N′-bis(4-pyridylcarboxamide)-1,2-ethane (bpce) and N,N′-bis(4-(4-pyridylcarboxamide)phenyl)methane (bpcpm)). Compounds 1–8 were formed by multicomponent self-assembly under one-pot reaction conditions via oxidative addition of dialkyl/diaryl chalcogenide to rhenium carbonyl with pyridyl ligands. The resultant metallacyclophanes were characterized using elemental analyses, infrared, ultraviolet–visible, and NMR spectroscopic techniques. Metallacyclophanes 1–3 and 7 were structurally characterized by single-crystal X-ray diffraction methods. The solvent-induced structural change of flexible tetranuclear metallacyclophane 2 was demonstrated by crystallizing 2 in dichloroethane and dimethylformamide. Molecular recognition capabilities of 2 and 7 were studied with few aromatic compounds containing ethereal linkages.