Reversibly Stretching Cocrystals by the Application of a Magnetic Field

Luo, Yang‐Hui; Wang, Jingwen; Chen, Chen; Li, Yaojia; Sun, Bai‐Wang

doi:10.1021/acs.cgd.7b00116

Cited by 20 publications

(12 citation statements)

References 49 publications

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“…This phenomenon can be attributed to the different interaction of external magnetic field with paramagnetic iron(II) centers and antimagnetic 1,4-dcb molecules. 1.0 T is strong enough to separate the paramagnetic ions from antimagnetic organic molecules, which is similar to the results of our previous work, whereas 0.5 T is too weak to separate the paramagnetic ions but has a profound effect on the antimagnetic organic molecules. We surmise that under the external magnetic field of 0.5 T, the molecular concentration distribution in the solution has been changed, resulting in a high vacancy concentration, with a relatively low vacancy mobility owing to the disorder of 1,4-dcb molecules in complex 2 .…”

Section: Results and Discussionsupporting

confidence: 90%

Molecular Disorder Induced by the Application of an External Magnetic Field during Crystal Growth

Hong

Luo

et al. 2019

J. Phys. Chem. C

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Two new isostructural iron(II) complexes 1 and 2, with the formula of Fe(1,4-dcb)(N(CN) 2 ) 2 (1,4-dcb = 1,4-dichlorobenzene), have been prepared and characterized. 1 was obtained under the ambient condition, whereas 2 was prepared by the application of an external magnetic field with a strength of 0.5 T. Single-crystal X-ray structural analysis and Hirshfeld calculations have revealed that the external magnetic fields have induced the disorder of 1,4-dcb molecules in 2, which strengthened the Cl•••N halogen-bonding contacts between 1,4-dcb arrays and one-dimensional (1D) Fe(N(CN) 2 ) 2 chains. As a consequence, coplane stacking of 1,4-dcb arrays and 1D Fe(N(CN) 2 ) 2 chains has been observed in 2. Compared with the stepped stacking and paramagnetic character for 1, the coplane stacking in 2 has increased the lattice cooperativity and ligand-field strength of N(CN) 2 , which thus provided partial spin-state transition. While under 1.0 T, the complex was broken and resulted in the formation of crystals Fe(ClO 4 )•6(H 2 O), suggesting significantly the different influence of magnetic field strength on paramagnetic ions and antimagnetic organic molecules. These results have provided an effective strategy for molecular design with desired physical−chemical properties.

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Section: Results and Discussionsupporting

confidence: 90%

Molecular Disorder Induced by the Application of an External Magnetic Field during Crystal Growth

Hong

Luo

et al. 2019

J. Phys. Chem. C

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“…3D Hirshfeld surface and 2D fingerprint plot analysis , (Figure and Figures S5 and S6) were performed to compare the polar 3,5-diamino-1,2,4-triazolinium cations at different dielectric states. Shown in Figure are the Hirshfeld d norm surfaces, crystal voids, and electron density of the polar 3,5-diamino-1,2,4-triazolinium cation at HDS and LDS, respectively, where the proportion of the significant hydrogen-bonding contacts (Figure a, represented by the large deep-red circular depressions on the d norm surfaces) has shown an increase with the decrease in temperature, from 58.6% contribution to the total Hirshfeld surfaces at 293 K to 62.5% at 100 K (Table S4).…”

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confidence: 99%

Thermal-Induced Dielectric Switching with 40K Wide Hysteresis Loop Near Room Temperature

Luo

Chen

Hong

et al. 2018

J. Phys. Chem. Lett.

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A thermal-induced dielectric switching has been realized in two ion-pair crystal [CHN]·[HPO] (1, CHN = 3,5-diamino-1,2,4-triazolinium) through single-crystal-to-single-crystal phase transition (SCSC-PT). Upon cooling from room temperature, the 1D cation stripes that are composed of [CHN] cations have undergone a 90° sharp rotation around the c axis, accompanied by the transition of crystal stacking from loose unparallel (dynamic state) to compression parallel (static state) and reorientation of dipoles on the [CHN] cation, which thus resulted in high dielectric state to low dielectric state transformation. While on the warming run, the reverse process was rather sluggish, resulting in a reversible dielectric switching with ultralarge (about 40K wide) hysteresis loop near room temperature. It is thought that the large-sized polar cation stripes have a predominant influence on the switching properties of 1.

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“…In comparison, the magnetic field of 0.5 T strength could alter the stretching distance of molecules in 18-Crown-6/1,2,4-triazole ( Figure 9C ). In consequence, the physical/chemical properties of the two cocrystals were altered ( Luo et al, 2017 ). Ultimately, the two cocrystals were separated completely under the magnetic fields of 1.5 and 1.0 T strengths, respectively.…”

Section: Magnetic Properties and Functionalitiesmentioning

confidence: 99%

“…(Reproduced from Nakajima et al (2004) with permission from American Chemical Society, Copyright 2004.). (C) Transformations of 18-Crown-6/4,5-dicyanoimidazole and 18-Crown-6/1,2,4-triazole under an external magnetic field with various strengths (Reproduced from Luo et al (2017) with permission from American Chemical Society, Copyright 2017.).…”

Section: Magnetic Properties and Functionalitiesmentioning

confidence: 99%

Organic Cocrystals: Recent Advances and Perspectives for Electronic and Magnetic Applications

Jiang

Zhen

et al. 2021

Front. Chem.

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Cocrystal engineering is an advanced supramolecular strategy that has attracted a lot of research interest. Many studies on cocrystals in various application fields have been reported, with a particular focus on the optoelectronics field. However, few articles have combined and summarized the electronic and magnetic properties of cocrystals. In this review, we first introduce the growth methods that serve as the basis for realizing the different properties of cocrystals. Thereafter, we present an overview of cocrystal applications in electronic and magnetic fields. Some functional devices based on cocrystals are also introduced. We hope that this review will provide researchers with a more comprehensive understanding of the latest progress and prospects of cocrystals in electronic and magnetic fields.

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Reversibly Stretching Cocrystals by the Application of a Magnetic Field

Cited by 20 publications

References 49 publications

Molecular Disorder Induced by the Application of an External Magnetic Field during Crystal Growth

Molecular Disorder Induced by the Application of an External Magnetic Field during Crystal Growth

Thermal-Induced Dielectric Switching with 40K Wide Hysteresis Loop Near Room Temperature

Organic Cocrystals: Recent Advances and Perspectives for Electronic and Magnetic Applications

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