5 years ago

Synthesis and solution behaviour of metal-carbonyl amphiphiles with an Fp (CpFe(CO)2) junction

Synthesis and solution behaviour of metal-carbonyl amphiphiles with an Fp (CpFe(CO)2) junction
Metallo-amphiphilic macromolecules with an iron-carbonyl junction (PEGPPh2-FpR, PEGPPh2: polyethylene glycol diphenyl phosphine, Mn, PEG = 550 or 2000 g/mol; R = octadecyl or hexyl; Fp = CpFe(CO)2) are synthesized via migration insertion reaction of FpR in the presence of PEGPPh2 and are characterized using 31P, 1H NMR and IR. The prepared amphiphiles are air stable, soluble in most organic solvents, e.g. THF, DCM, DMF, and exhibit a reversible redox activity as indicated by cyclic voltammetry (CV) experiments. Surface tension measurements indicate that the prepared molecules exhibit typical amphiphilic properties with critical micelle concentrations (CMC) in water ranging between 30 and 113 μM. The aqueous micelles aggregated from PEGPPh2-FpR agglomerate into suspensions, which is similar with the solution behaviour of Brij® surfactants, the organic analogue without the Fp junction. The redox activity of Fp junction in 14, which is sensitive to assembling structures, will be a possible advantage for further investigation on this agglomeration behaviour.

Publisher URL: www.sciencedirect.com/science

DOI: S0022328X17305144

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