Dataset Information

Synthesis and Magnetic Properties of a Copper Cube: [Cu₄(OH)₄(C₁₆H₁₈N₂)₄]⁴⁺ (ClO₄)₄ C₃H₆O [C₁₆H₁₈N₂=(E)-1,6-[Di(pyridin-4-yl)hex-3-ene].

ABSTRACT: The synthesis of a Cu₄(OH)₄ cube which is coordinated by four molecules of the dipyridyl ligand 1,6-[di(pyridin-4-yl)hex-3-ene] is reported. This compound has a trans double bond which restricts the conformational freedom of the ligand and favours coordination within a unique copper cube. The structure was solved by an X-Ray single crystal structure determination and low temperature magnetic susceptibility measurements examined its magnetic properties. The cube classification corresponds to the type I classification of Mergehenn and Haase and the short/long distribution of Cu?????Cu separations in the cube as defined by Ruiz. The magnetic susceptibility measurements show paramagnetic behaviour down to 50?K but below this the copper cube shows weak ferromagnetic exchange interactions. The low temperature magnetic susceptibility characteristics are examined in detail then modelled and compared to other similar Cu₄O₄ copper cubes.

SUBMITTER: Plater MJ

PROVIDER: S-EPMC6737335 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Publications

Synthesis and Magnetic Properties of a Copper Cube: [Cu4(OH)4(C16H18N2)4]4+ (ClO4)4 C3H6O [C16H18N2=(E)-1,6-[Di(pyridin-4-yl)hex-3-ene].

Plater M John MJ Darr Amara A Crawford Catriona C Murray Craig C Simpson Struan S Harrison William T A WTA Clemente-Juan Juan M JM

ChemistryOpen 20190911 9

The synthesis of a Cu4(OH)4 cube which is coordinated by four molecules of the dipyridyl ligand 1,6-[di(pyridin-4-yl)hex-3-ene] is reported. This compound has a trans double bond which restricts the conformational freedom of the ligand and favours coordination within a unique copper cube. The structure was solved by an X-Ray single crystal structure determination and low temperature magnetic susceptibility measurements examined its magnetic properties. The cube class ...[more]

PMID: 31523608

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Project description:Monitoring changes in stable oxygen isotope ratios in molecular oxygen allows for studying many fundamental processes in bio(geo)chemistry and environmental sciences. While the measurement of [Formula: see text]O/[Formula: see text]O ratios of [Formula: see text] in gaseous samples can be carried out conveniently and from extracting moderately small aqueous samples for analyses by continuous-flow isotope ratio mass spectrometry (CF-IRMS), oxygen isotope signatures, [Formula: see text]O, could be overestimated by more than 6[Formula: see text] because of interferences from argon in air. Here, we systematically evaluated the extent of such Ar interferences on [Formula: see text]O/[Formula: see text]O ratios of [Formula: see text] for measurements by gas chromatography/IRMS and GasBench/IRMS and propose simple instrumental modifications for improved Ar and [Formula: see text] separation as well as post-measurement correction procedures for obtaining accurate [Formula: see text]O. We subsequently evaluated the consequences of Ar interferences for the quantification of O isotope fractionation in terms of isotope enrichment factors, [Formula: see text], and [Formula: see text]O kinetic isotope effects ([Formula: see text]O KIEs) in samples where [Formula: see text] is consumed and Ar:[Formula: see text] ratios increase steadily and substantially over the course of a reaction. We show that the extent of O isotope fractionation is overestimated only slightly and that this effect is typically smaller than uncertainties originating from the precision of [Formula: see text]O measurements and experimental variability. Ar interferences can become more relevant and bias [Formula: see text] values by more than [Formula: see text] in aqueous samples where fractional [Formula: see text] conversion exceeds 90%. Practically, however, such samples would typically contain less than 25 [Formula: see text]M of [Formula: see text] at ambient temperature, an amount that is close to the method detection limit of [Formula: see text]O/[Formula: see text]O ratio measurement by CF-IRMS.

Dataset Information

Synthesis and Magnetic Properties of a Copper Cube: [Cu₄(OH)₄(C₁₆H₁₈N₂)₄]⁴⁺ (ClO₄)₄ C₃H₆O [C₁₆H₁₈N₂=(E)-1,6-[Di(pyridin-4-yl)hex-3-ene].

Publications

Synthesis and Magnetic Properties of a Copper Cube: [Cu<sub>4</sub>(OH)<sub>4</sub>(C<sub>16</sub>H<sub>18</sub>N<sub>2</sub>)<sub>4</sub>]<sup>4+</sup> (ClO<sub>4</sub>)<sub>4</sub> C<sub>3</sub>H<sub>6</sub>O [C<sub>16</sub>H<sub>18</sub>N<sub>2</sub>=(<i>E</i>)-1,6-[Di(pyridin-4-yl)hex-3-ene].

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