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Three kinds of heteroaldehydes, N-(3-triethoxysilylpropyl)-4-formyl benzamide (TPHA/SiO 2), were prepared by the reaction of terephthalaldehydic acid with different silica supports such as hexagonal SBA-15, spherical SBA-15 and amorphous SiO 2 for comparison purposes. Anchoring of this aldehyde to different supports allows the synthesis of mono-sub...
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... incorporation of the organic parts into the silica structure can be monitored by analysing FT-IR spectra of the different compounds. Figure 5 compares FT-IR spectra of heterogenized aldehyde (1), SBA-15(Hex) and aldehyde (1). The infrared spectrum of the silica gel shows the typical Si-O lattice vibrations: a strong and broad band at 1064 cm -1 with a shoulder at 1200 cm -1 ; a strong band at 445 cm -1 and a medium intensity band at 790 cm -1 . ...
Citations
We explored the coupling of laccases to magnetic nanoparticles (MNPs) with different surface chemical coating. Two laccase variants offering two opposite and precise orientations of the substrate oxidation site were immobilised onto core-shell MNPs presenting either aliphatic aldehyde, aromatic aldehyde or azide functional groups at the particles surface. Oxidation capabilities of the six-resulting laccase-MNP hybrids were compared on ABTS and coniferyl alcohol. Herein, we show that the original interfaces created differ substantially in their reactivities with an amplitude from 1 to > 4 folds depending on the nature of the substrate. Taking enzyme orientation into account in the design of surface modification represents a way to introduce selectivity in laccase catalysed reactions.
Inorganic‐organic hybrid nanoparticles (IOH‐NPs) with a general composition [ZrO]2+[RDyeOPO3]2‐, [Ln]3+n/3[RDye(SO3)n]n‐, [Ln(OH)]2+n/2[RDye(SO3)n]n‐, or [LnO]+n[RDye(SO3)n]n‐ (Ln: lanthanide) are a novel class of nanomaterials for fluorescence detection and optical imaging. IOH‐NPs are characterized by an extremely high load of the fluorescent dye (70‐85 wt‐%), high photochemical stability, straightforward aqueous synthesis, low material complexity, intense emission and high cell uptake at low toxicity. Besides full‐color emission, IOH‐NPs are suitable for multimodal imaging, singlet‐oxygen generation as well as drug delivery and drug release. This focus review presents the material concept of the IOH‐NPs as well as their synthesis and characterization. Their characteristic features are illustrated by selected in vitro and in vivo studies to initiate application in biology and medicine.
The inorganic-organic hybrid nanoparticles Gd43+[AlPCS4]34– and La43+[TPPS4]34– ([AlPCS4]4–: aluminium(III) chlorido phthalocyanine tetrasulfonate; [TPPS4]4–: tetraphenyl-porphine sulfonate) are shown for the first time. Both were obtained via straightforward aqueous synthesis and contain extremely high contents of [AlPCS4]34– (81 wt-%) and [TPPS4]34– (83 wt-%). They show efficient 1O2 production upon daylight and red-light irradiation. Photocatalysis is evidenced via dye degradation as a prove-of-the-concept and proceeds with daylight and even red-light illumination.
