A series of Ni(II) trinuclear complexes, [Ni 3 (sala-X) 6 ] (sala-X = o-[(p-X-phenylimino)methyl]phenol; X = Br 1-Br, Me 1-Me and OMe 1-OMe), have been prepared and fully characterised. X-ray crystallographic studies reveal that the complexes are composed of three face-sharing octahedral Ni(II) metal ions bridged by the phenoxide oxygens of the sala-X ligands. Magnetic studies indicate that the magnetic Ni(II) centres are ferromagnetically coupled with the substituent group having only a minor impact on the magnitude of coupling. DFT calculations also support ferromagnetic coupling with smaller Ni-O-Ni angles leading to slightly larger coupling constants in line with previous studies.File list (3) download file view on ChemRxiv Ni-sala-X-paper-final.pdf (584.80 KiB) download file view on ChemRxiv Ni-sala-X-paper-ESI_final.pdf (787.40 KiB) download file view on ChemRxiv Figures.zip (2.50 MiB)
Astaxanthin (AX) is one of the major bioactives that has been found to have strong antioxidant properties. However, AX tends to degrade due to its highly unsaturated structure. To overcome this problem, a Pickering O/W emulsion using nanofibrillated cellulose (NFC) as an emulsifier was investigated. NFC was used because it is renewable, biodegradable, and nontoxic. The 10 wt% O/W emulsions with 0.05 wt% AX were prepared with different concentrations of NFC (0.3–0.7 wt%). After 30 days of storage, droplet size, ζ-potential values, viscosity, encapsulation efficiency (EE), and color were determined. The results show that more stable emulsions are formed with increasing NFC concentrations, which can be attributed to the formulation of the NFC network in the aqueous phase. Notably, the stability of the 0.7 wt% NFC-stabilized emulsion was high, indicating that NFC can improve the emulsion’s stability. Moreover, it was found that fat digestibility and AX bioaccessibility decreased with increasing NFC concentrations, which was due to the limitation of lipase accessibility. In contrast, the stability of AX increased with increasing NFC concentrations, which was due to the formation of an NFC layer that acted as a barrier and prevented the degradation of AX during in vitro digestion. Therefore, high concentrations of NFC are useful for functional foods delivering satiety instead of oil-soluble bioactives.
A series of Ni(II) trinuclear complexes, [Ni<sub>3</sub>(sala-X)<sub>6</sub>] (sala-X = <i>o</i>-[(<i>p</i>-X-phenylimino)methyl]phenol; X = Br <b>1-Br</b>, Me <b>1-Me</b> and OMe <b>1-OMe</b>), have been prepared and fully characterised. X-ray crystallographic studies reveal that the complexes are composed of <a>three face-sharing octahedral Ni(II) metal ions bridged by the phenoxide oxygens of the sala-X ligands</a>. Magnetic studies indicate that the magnetic Ni(II) centres are ferromagnetically coupled with the substituent group having only a minor impact on the magnitude of coupling. DFT calculations also support ferromagnetic coupling with smaller Ni-O-Ni angles leading to slightly larger coupling constants in line with previous studies.
A series of Ni(II) trinuclear complexes, [Ni<sub>3</sub>(sala-X)<sub>6</sub>] (sala-X = <i>o</i>-[(<i>p</i>-X-phenylimino)methyl]phenol; X = Br <b>1-Br</b>, Me <b>1-Me</b> and OMe <b>1-OMe</b>), have been prepared and fully characterised. X-ray crystallographic studies reveal that the complexes are composed of <a>three face-sharing octahedral Ni(II) metal ions bridged by the phenoxide oxygens of the sala-X ligands</a>. Magnetic studies indicate that the magnetic Ni(II) centres are ferromagnetically coupled with the substituent group having only a minor impact on the magnitude of coupling. DFT calculations also support ferromagnetic coupling with smaller Ni-O-Ni angles leading to slightly larger coupling constants in line with previous studies.
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