Phosphaalkene-oxazoline copolymers with styrene as chiral ligands for rhodium(I)
| Autor: | Derek P. Gates, Gregory R. Dake, Spencer C. Serin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010405 organic chemistry
chemistry.chemical_element Oxazoline 010402 general chemistry 01 natural sciences 0104 chemical sciences Styrene Rhodium Inorganic Chemistry Metal chemistry.chemical_compound Monomer chemistry visual_art Polymer chemistry visual_art.visual_art_medium Copolymer Phosphaalkene Macromolecule |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 45(13) |
| ISSN: | 1477-9234 |
| Popis: | The radical-initiated copolymerization of phosphaalkene-oxazoline, MesP[double bond, length as m-dash]C(Ph)CMe2Ox [1, Ox = CNOCH(iPr)CH2] with different loadings of styrene affords poly(methylenephosphine-co-styrene)s [2a (1 : S = 1 : 2): Mw = 7400 g mol(-1), PDI = 1.1; 2b (1 : S = 1 : 5): Mw = 18 000 g mol(-1), PDI = 1.2; 2c (1 : S = 1 : 10): Mw = 16 000 g mol(-1), PDI = 1.3]. Copolymers 2a-2c are demonstrated as viable macromolecular ligands for rhodium(i). By comparison with the crystallographically characterized model P,N-bidentate complex, [Mes(Me)P-CH(Ph)CMe2Ox·Rh(cod)]BF4, the polymer complexes [2·Rh(cod)]BF4 were prepared. The macromolecular metal complexes were characterized by GPC {for [2a·Rh(cod)]BF4: Mw = 14 000 g mol(-1), PDI = 1.2}, UV/Vis spectroscopy, (1)H, (13)C and (31)P NMR spectroscopy. Integration of the (31)P NMR spectra of mixtures of 2 and [Rh(cod)2]BF4 permitted the determination of the mol% of incorporation of monomer 1 in copolymer 2 (2a: 17%; 2b: 5%; 2c: 4%). These results compared favorably with those determined by elemental analysis (2a: 17%; 2b: 6%). |
| Databáze: | OpenAIRE |
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