Biomimetic 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Ethylene Production by MIL-100(Fe)-Based Materials

Abstract

A novel core@shell hybrid material based on biocompatible hydroxyapatite nanoparticles (HA) and the well-known MIL-100­(Fe) (Fe3O­(H2O)2F­(BTC)2·nH2O, BTC: 1,3,5-benzenetricarboxylate) has been prepared following a layer-by-layer strategy. The core@shell nature of the studied system has been confirmed by infrared, X-ray powder diffraction, N2 adsorption, transmission electron microscopy imaging, and EDS analyses revealing the homogeneous deposition of MIL-100­(Fe) on HA, leading to HA@MIL-100­(Fe) rod-shaped nanoparticles with a 7 nm shell thickness. Moreover, both MIL-100­(Fe) and HA@MIL-100­(Fe) have demonstrated to act as efficient heterogeneous catalysts toward the biomimetic oxidation of 1-aminocyclopropane-1-carboxylic acid into ethylene gas, a stimulator that regulates fruit ripening. Indeed, the hybrid material maintains the catalytic properties of pristine MIL-100­(Fe) reaching 40% of conversion after only 20 min. Finally, the chemical stability of the catalyst in water has also been monitored for 21 days by inductively coupled plasma-mass spectrometry confirming that only ca. 3% of Ca is leached.

Hierarchical Porous Iron Metal–Organic Gel/Bacterial Cellulose Aerogel: Ultrafast, Scalable, Room-Temperature Aqueous Synthesis, and Efficient Arsenate Removal

“…In the case of the Fe-MOG/BC composite, the characteristic peaks associated with carboxylic acid groups (1715 cm –1 ), asymmetric and symmetric vibration (1380, 1450, 1580, and 1630 cm –1 ), out-of-plane vibration (955, 1050, and 1130 cm –1 ), CO stretching vibration (760 cm –1 ), and CC stretching vibration (714 cm –1 ) are clearly observed. Meanwhile, the appearance of the Fe–O metal–oxo bond (625 cm –1 ) provides further evidence for the successful grafting of Fe-MOG on BC. − Furthermore, Raman spectra also reveal that the Fe-MOG/BC composite effectively integrates the characteristic peaks from both BC and pure Fe-MOG (Figure S4), suggesting the successful immobilization of Fe-MOG on BC. ,,, …”

Synthesis and Characterization of Sol–Gel‐Derived SiO2–CaO Particles: Size Impact on Glass (Bio)Properties

“…Hydroxyapatite nanoparticles (HA) used as a reference were synthesized according to a previous method. [ 57 ]…”

Zn(ii) metal–organic architectures from ether-bridged tetracarboxylate linkers: assembly, structural variety and catalytic features

“…The Zn-O [1.943(3)-2.231( 4) Å] and Zn-N [2.038(4)-2.073(3) Å] bonds are within typical values. 19,28,34 The dia 4− block functions as a μ 7 -linker (mode V, Scheme 2), in which one of the COO − groups is bidentate while the other three groups are μ-bridging bidentate. Given a multiply bridging nature of μ 7dia 4− , there is a formation of an intricate 3D metal-organic framework (Fig.…”

“…[28][29][30][31][32][33] Among them, aromatic polycarboxylic acids stand out as the most commonly applied linkers for assembling coordination polymers, metal-organic frameworks, and derived materials. [34][35][36][37][38][39] A considerable focus of current research is devoted to the design of novel carboxylate linkers with multiple potential sites for coordination, followed by their exploration in the synthesis of metal-organic architectures.…”