Erwann Jeanneau

The title compound, C ₁₇ H ₁₈ C _l2 N ₄ S ₂ , crystallizes in the monoclinic space group I 2/ a with one molecule in the asymmetric unit. In the molecule, two 1-(4-chlorophenyl)thiourea entities are bridged by a propyl fragment. The thiourea entities are inclined relative to the propyl group in different ways, as shown by the C—C—C—N torsion angles of −71.23 (13) and −179.50 (10)°. In the crystal, N—H...S hydrogen bonds lead to the formation of supramolecular layers parallel to (001).

An environmentally friendly magnetic metal–organic framework (MMOF) based on MIL-53(Al) was synthesized using terephthalic acid (TPA) recovered from polyethylene terephthalate (PET) waste as the organic linker. The Fe2O3@MIL-53(Al) adsorbent was fabricated through a layer-by-layer assembly, with polyethylenimine (PEI) bridging the Fe2O3 core (∼200 nm) and MIL-53(Al) shell (∼25 nm). A uniform MOF layer was achieved in a single cycle under green synthesis conditions with PEI concentrations ≥ 10 g/L. The MMOF efficiently removed organophosphate pollutants, particularly 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), a common scale and corrosion inhibitor. Adsorption kinetics across a pH range of 3–10.5 closely match the pseudo-second-order kinetic model, indicating chemisorption. The adsorption capacity ranged from 250 to 460 mg/g, with a maximum surface-normalized capacity of 0.44 mg/m2 at pH 5.5, attributed to favorable electrostatic interactions. Adsorption performance was strongly influenced by both the MMOF zeta potential and the ionization state of PBTC. The well-fitted adsorption isotherms (R2 > 0.9) to the Freundlich, Temkin, and Henry models indicate heterogeneous surface adsorption mechanisms. Electrostatic attraction, hydrogen bonding, and surface complexation are proposed as the dominant mechanisms. Overall, the Fe2O3/PEI/MIL-53(Al) composite exhibits high adsorption capacity, broad pH stability, and low toxicity, highlighting its promise for efficient PBTC antiscalant removal applications.

The title compound, C ₂₂ H ₁₉ NO ₂ , is an imino-ketone Schiff base. The configuration about the azomethine bond is E . The aromatic rings of the 1,2-diphenylethanone moiety are inclined to each other by 80.43 (7)°. The 4-ethoxyphenyl ring is inclined to the phenylethanone ring by 81.91 (7)° and to the phenyl ring to which it is trans by 68.56 (7)°. In the crystal, four symmetry-related molecules are linked by C—H...O hydrogen bonds to form square-like units with an R ³ ₄ (36) ring motif, which are linked through bifurcated C—H...O hydrogen bonds to form sheets parallel to the (10 1 ) plane.

The synthesis of original tricyclic compounds featuring both 3,4-dihydro- 2H -benzo[b][1,4] oxazine and cyclopentenone cores was addressed. Starting from the biobased 5-chloromethylfurfural, a robust 3-step sequence to key aryl furylcarbinol substrates supported a diastereoselective intramolecular aza Piancatelli reaction, effective under both Lewis and Brønsted catalysis. A scope of thirteen diversely substituted spirobenzoxazines was targeted and some limits could be also drawn. Seventeen diastereomerically defined spirocyclic molecules were overall isolated. All the synthesized compounds were characterized by NMR analysis. The structure and relative stereochemistry of spirocycles were confirmed by single-crystal X-ray diffraction (XRD) studies. An extension to analogous compound featuring a quinoxaline moiety could also be initiated. Preliminary evaluations of biological activities were performed.

Alkane elimination reactions between stable magnesium and manganese dialkyls, [L_nM(CH₂tBu)₂] (M = Mg, Mn), and an iridium polyhydride species, [Cp*IrH₄] (Cp* = C₅Me₅), provide a variety of heterobimetallic Mg-Ir and Mn-Ir hydride complexes. In several cases, their solid-state molecular structures are shown to be virtually identical despite fundamentally different electronic properties of Mg(II) (2p⁶) and Mn(II) (3d⁵). A direct comparison of the paramagnetic Mn with the diamagnetic Mg analog enables a comprehensive characterization based on a combination of analytical techniques (single-crystal X-ray diffraction, IR, and NMR spectroscopies), especially with respect to the hydride ligands, traditionally difficult to identify in open-shell species. Nevertheless, such congruence is not universal: the nuclearity and M:Ir stoichiometry depend on the nature of the Mg and Mn dialkyl precursors, which in turn is determined by the type of coligand L, and on the presence of proton-donating reagents in the reaction mixture, revealing subtle differences between the Mg and Mn systems in certain cases.

We describe a very simple and efficient gram-scale synthetic pathway towards Boranils substituted di-rectly on the boron center by 1,1'-bi-2-naphthol derivatives (BINOL). Properties of the resulting BINOL-Boranils were investigated by nuclear magnetic resonance (NMR), UV-visible, fluorescence, electronic circular dichroism (ECD) and circularly polarized luminescence (CPL) spectroscopies. Insight on the mo-lecular structure is also provided based on single-crystal X-ray diffraction experiments. These chiral dyes typically feature high molar absorption coefficients in the range of 35,000 to 90,000 M-1.cm-1, ab-sorption dissymmetry factors (gabs) in the range of 2.5–5.5 x 10-4 at the maximum wavelength of ab-sorption of Boranils and CPL brightness up to BCPL = 5.4 M-1.cm-1.

A new bispyrazolylpyridine(BPP)-containing derivative, namely, 4-(3,5-dimethyl-1,7-diphenyl-1,7-dihydrodipyrazolo[3,4- b :4′,3′- e ]pyridin-4-yl)phenol ( 1 ), C ₂₇ H ₂₁ N ₅ O·2C ₂ H ₆ OS, has been synthesized by a Hantzsch multicomponent reaction using acetic acid (AcOH) as solvent and copper(II) acetate monohydrate [Cu(OAc) ₂ ·H ₂ O] as mild oxidant. The structure of the compound was fully characterized by single-crystal X-ray diffraction. The crystallographic study shows that the molecule crystallizes in the triclinic system with space group P 1 , with one molecule per asymmetric unit. Whereas the phenolic substituent in the para position of the pyridine group is highly twisted from the planar bispyrazolopyridine core [56.19 (4)°], the two phenyl rings present on the nitrogen atoms are only slightly distorted [11.77 (5) and 29.17 (5)°]. The crystal structure is consolidated by intermolecular C—H...O hydrogen bonds and π–π stacking interactions.