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• W4281291284 abstract "Abstract The catalytic activity of four transition metal hexacyanoferrate(II) complexes (Ni 2 [Fe(CN) 6 ], Co 2 [Fe(CN) 6 ], KFe[Fe(CN) 6 ] and Zn 2 [Fe(CN) 6 ]) in the ring-opening copolymerization (ROCOP) of CO 2 and propylene oxide (PO) is reported here for the first time and compared with that of other hexacyanometallate compounds. Complexes were prepared by coprecipitation employing tert -butanol as complexing agent. X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, X-ray fluorescence, scanning electron microscopy, transmission electron microscopy and N 2 physisorption were used to confirm the identity of the obtained materials. Except for Zn 2 [Fe(CN) 6 ], which showed an amorphous nature, the complexes were constituted by aggregates of cubic nanocrystals with intra-crystalline micropores and inter-crystalline mesopores. Gas–solid phase titration with NH 3 revealed the high potential of hexacyanoferrates as Lewis acid catalysts. In the case of Zn 2 [Fe(CN) 6 ], the lack of structural organization led to an extremely high density of acid sites (43 μmol m −2 ). The resulting copolymers were analyzed via nuclear magnetic resonance spectroscopy and gel permeation chromatography. The studied transition metal hexacyanoferrate(II) catalysts showed mild activity in the target reaction, giving rise to polyethercarbonates with moderate CO 2 content (9.3–18.1 wt%), random configuration (67.0–92.4% of polyethercarbonate linkages), modest molecular weights (M W , g mol −1 = 3400–20,200) and high dispersity (Đ M = 4.0–5.4). Cyclic propylene carbonate (PC) was also produced (1.4–19.8 wt%). Among all, the Co 2 [Fe(CN) 6 ] complex stands as a potential catalyst for CO 2 /PO ROCOP due to its high CO 2 uptake, selectivity and molecular weight of the obtained copolymer." @default.
• W4281291284 created "2022-05-24" @default.
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• W4281291284 date "2022-05-23" @default.
• W4281291284 modified "2023-10-14" @default.
• W4281291284 title "Transition Metal Hexacyanoferrate(II) Complexes as Catalysts in the Ring-Opening Copolymerization of CO2 and Propylene Oxide" @default.
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• W4281291284 doi "https://doi.org/10.1007/s11244-022-01628-z" @default.
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