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An unprecedented spin cluster‐based network architecture {[NiII2(pdaa)(OH)2(H2O)]n (H2pdaa=1,4‐phenylene diacetic acid)}, comprising 1D linear chains of NiII ions crosslinked via Ni4O4 cubanes, forms under hydrothermal conditions; this 3D coordination network exhibits magnetic ordering at 23.9 K as well as a second magnetic ordering process at 2.8 K likely associated with a structural phase transition. [ABSTRACT FROM AUTHOR]

Cover Feature: Magnetic Phase Transitions in a Ni4O4-Cubane-Based Metal-Organic Framework (Chem. Eur. J. 34/2020) Keywords: cubanes; magnetic materials; metal-organic frameworks; nickel; phase transitions EN cubanes magnetic materials metal-organic frameworks nickel phase transitions 7512 7512 1 06/22/20 20200618 NES 200618 B Four eyes see more than two b : Operando EPR, XANES/EXAFS, ATR-IR, and UV/Vis spectroscopy have been coupled in the same experiment to complete the mechanistic puzzle in selective aerobic alcohol oxidation by a copper-TEMPO catalyst. Cubanes, magnetic materials, metal-organic frameworks, nickel, phase transitions. [Extracted from the article]

Abstract: A magnetically separable single-phase MgFe2O4 photocatalyst with a spinel crystal structure was synthesized by using the solid-state reaction method. The formation of spinel structure is confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. The magnetic measurements showed that the photocatalyst material can be separated from water when an external magnetic field is added and redispersed into water solution after the external magnetic field is eliminated. It is one of the promising photocatalysts for waste water treatment. The photocatalytic activity of MgFe2O4 was investigated by using the photo-decomposition of methylene blue dye under visible light. The photoelectrochemical property of the MgFe2O4 was studied by measuring their photocurrent–potential behavior in 1 M NaOH electrolyte under AM 1.5100 mW cm−2 illumination. [Copyright &y& Elsevier]