Spontaneous resolution of two chiral metal–organic frameworks through local geometric and lattice frustration effects

Windsor, Hunter J.; Kepert, Cameron J.; Macreadie, Lauren K.

doi:10.1039/d3ce00784g

Cited by 6 publications

References 57 publications

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Direct measurement of magnetocaloric effect (MCE) in frustrated Gd-based molecular complexes

Zhang,

Nomoto,

Yamashita

et al. 2024

J Therm Anal Calorim

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Generation of low temperatures below 1 K has been required for applications and fundamental research, given this, development of new materials utilized for demagnetization cooling has extensively been performed in recent years. Here, we studied two polynuclear Gd3+-based molecular compounds of Gd0.33[Gd4(OH)4(OAc)3][Rh4Zn4(L-cys)12]·32H2O (1Gd) and Gd0.33[Gd4(OH)4(OAc)3][Ir4Zn4(L-cys)12]·28H2O (2Gd) (L-cys = L-cysteinate) which show paramagnetic even at low temperatures due to their frustrated arrangement of Gd3+ ions. We discuss the magnitude of the magnetocaloric effect (MCE) in them inferred from the isothermal magnetic entropy change ($${\Delta S}_{\text{M}}$$ Δ S M ) from isothermal magnetization data. The − $$\Delta S_{{\text{M}}}^{{{\text{max}}}}$$ Δ S M max of 1Gd and 2Gd are 15.15 J kg−1 K−1 and 17.49 J kg−1 K−1 occur at 2.0 K under an applied field from 0 to 7 T, respectively. We also discussed the results of heat capacity measurement under magnetic fields to confirm the validity of the entropy change for 1Gd. Furthermore, with an aim of detecting their MCE directly, we have developed a new non-magnetic and metal-free magnetocaloric measurement cell. The adiabatic temperature change ($$\Delta T_{{{\text{ad}}}}$$ Δ T ad ) occurs in a small amount of sample on an order of 102-microgram with the application and removal of various magnitude magnetic fields starting from several initial temperatures were detected directly, to evaluate the potential of them to be a refrigerant for an adiabatic demagnetization refrigerator. The instrumental design for direct measurements of MCE is described along with the construction details.

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Direct measurement of magnetocaloric effect (MCE) in frustrated Gd-based molecular complexes

Zhang,

Nomoto,

Yamashita

et al. 2024

J Therm Anal Calorim

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Chiral Ca–Mn-frameworks with double helical chains and one-dimensional channels constructed from enantiomorphous lactate synthons

Xu,

Yang,

et al. 2024

Journal of Solid State Chemistry

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Solvent-controlled assembly of helical coordination polymers based on lactate synthon from two-dimensional layer to three-dimensional framework

Xu,

Yang,

et al. 2024

Polyhedron

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Spontaneous resolution of two chiral metal–organic frameworks through local geometric and lattice frustration effects

Abstract: Two chiral metal–organic frameworks that are differentiated by their Cd-centred helical twists are prepared by spontaneous chiral resolution from rigid, aliphatic, and achiral precursors.

Cited by 6 publications

References 57 publications

Direct measurement of magnetocaloric effect (MCE) in frustrated Gd-based molecular complexes

Direct measurement of magnetocaloric effect (MCE) in frustrated Gd-based molecular complexes

Chiral Ca–Mn-frameworks with double helical chains and one-dimensional channels constructed from enantiomorphous lactate synthons

Solvent-controlled assembly of helical coordination polymers based on lactate synthon from two-dimensional layer to three-dimensional framework

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