Chemo-chromism in an orthogonal dabco-based Co(<scp>ii</scp>) network assembled by methanol-coordination and hydrogen bond formation

Shiga, Misaki; Kawaguchi, Shogo; Fujibayashi, Masaru; Nishihara, Sadafumi; Inoue, Katsuya; Akutagawa, Tomoyuki; Noro, Shin Ichiro; Nakamura, Takayoshi; Tsunashima, Ryo

doi:10.1039/c8dt01220b

Cited by 9 publications

(9 citation statements)

References 23 publications

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“…The UV–vis spectra corroborate the change of the coordination environments of Co II ions before and after solvothermal treatment (Figure c). For R -6Br , the band at 456 nm is assigned to the 4 T g (F) → 4 T g (P) and 4 T g (F) → 4 A 2g d–d transitions of high-spin octahedral Co II , while for R -6Br-de , bands appeared at 550, 581, and 618 nm, assigned to d–d transitions 4 A 2 → 4 T 1 (F) and 4 A 2 → 4 A 1 (P) for high-spin tetrahedral Co II ion. , However, despite the release of water and ABP molecules and the change of coordination spheres of Co(II) ions, the PXRD pattern of R -6Br-de is identical to that of the pristine R -6Br except for slight shifts of the diffraction peaks to higher angles (Figure d), suggesting that the layer structure is retained in R -6Br-de . The interlayer distance is reduced from 16.78 Å for R -6Br to 16.29 Å for R -6Br-de .…”

Section: Resultsmentioning

confidence: 97%

Layer or Tube? Uncovering Key Factors Determining the Rolling-up of Layered Coordination Polymers

et al. 2021

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Nanotubular materials have garnered considerable attention since the discovery of carbon nanotubes. Although the layer-to-tube rolling up mechanism has been well recognized in explaining the formation of many inorganic nanotubes, it has not been generally applied to coordination polymers (CPs). To uncover the key factors that determine the rolling-up of layered CPs, we have chosen the Co/R-, S-Xpemp [Xpemp = (4-X-1-phenylethylamino)methylphosphonic acid, X = H, F, Cl, Br] systems and study how the weak interactions influence the formation of layered or tubular structures. Four pairs of homochiral isostructural compounds R-, S-Co(Xpemp)(H2O)2 [X = H (1H), F (2F), Cl (3Cl), Br (4Br)] were obtained with tubular structures. The inclusion of 3,3′-azobipyridine (ABP) guest molecules led to compounds R-, S-[Co(Xpemp)(H2O)2]4·ABP·H2O with layered structures when X was Cl (5Cl) and Br (6Br), but tubular compounds 1H and 2F when X was H and F. Layered structures were also obtained for racemic compounds meso-Co(Xpemp)(H2O)2 [X = F (7F), Cl (8Cl), Br (9Br)] using racemic XpempH2 as the reaction precursor, but not when X = H. A detailed study on R- 6Br revealed that layer-to-tube transformation occurred upon removal of ABP under hydrothermal conditions, forming R- 4Br with a tubular structure. Similar layer-to-tube conversion did not occur in organic solvents. The results demonstrate that weak interlayer interactions are a prerequisite but not sufficient for the rolling-up of the layers. In the present cases, water also provides a driving force in the layer-to-tube transformation. The experimental results were rationalized by theoretical calculations.

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Section: Resultsmentioning

confidence: 97%

Layer or Tube? Uncovering Key Factors Determining the Rolling-up of Layered Coordination Polymers

et al. 2021

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“…Finally, several structural investigations for various compounds have already been performed using the developed RGVPC system, e.g. a flexible MOF compound with CO 2 separation and capture function (Hiraide et al, 2016(Hiraide et al, , 2017; a chemo-chromism complex under vacuum and methanol vapour (Shiga et al, 2018); acid responsive hydrogen-bonded organic frameworks compounds under CO 2 gas, benzene and hexane vapour (Hisaki et al, 2018(Hisaki et al, , 2019; and hydrogen-storage alloys under H 2 and D 2 gases (Dekura et al, 2018).…”

Section: Figurementioning

confidence: 99%

Fast continuous measurement of synchrotron powder diffraction synchronized with controlling gas and vapour pressures at beamline BL02B2 of SPring-8

Kawaguchi

Takemoto

Tanaka

et al. 2020

J Synchrotron Radiat

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A gas- and vapour-pressure control system synchronized with the continuous data acquisition of millisecond high-resolution powder diffraction measurements was developed to study structural change processes in gas storage and reaction materials such as metal organic framework compounds, zeolite and layered double hydroxide. The apparatus, which can be set up on beamline BL02B2 at SPring-8, mainly comprises a pressure control system of gases and vapour, a gas cell for a capillary sample, and six one-dimensional solid-state (MYTHEN) detectors. The pressure control system can be remotely controlled via developed software connected to a diffraction measurement system and can be operated in the closed gas and vapour line system. By using the temperature-control system on the sample, high-resolution powder diffraction data can be obtained under gas and vapour pressures ranging from 1 Pa to 130 kPa in temperatures ranging from 30 to 1473 K. This system enables one to perform automatic and high-throughput in situ X-ray powder diffraction experiments even at extremely low pressures. Furthermore, this developed system is useful for studying crystal structures during the adsorption/desorption processes, as acquired by millisecond and continuous powder diffraction measurements. The acquisition of diffraction data can be synchronized with the control of the pressure with a high frame rate of up to 100 Hz. In situ and time-resolved powder diffraction measurements are demonstrated for nanoporous Cu coordination polymer in various gas and vapour atmospheres.

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“…Chromism refers to changes in apparent color or luminescence of a substance upon the application of external stimuli (e. g. heat, electric potential, or pH) [1] . The employed stimulus causes one or more stereoelectronic changes to the material's structure, such as molecular re‐arrangements, [2,3] alteration of bandgap energies, [4–6] or modification of coordination environments, [7–9] which account for the switching of optical or luminescence properties [10] …”

Section: Introductionmentioning

confidence: 99%

Chromic Platinum Complexes Containing Multidentate Ligands

2021

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Platinum(II) complexes display versatile chromic behavior as a consequence of their square planar geometry, which enables intra‐ and intermolecular Pt⋅⋅⋅Pt interactions via open axial coordination sites. These metallophilic interactions are known to generate metal‐metal‐to‐ligand‐charge transfer (MMLCT) transitions, in addition to the ligand‐to‐ligand charge transfer (LLCT) and metal‐to‐ligand‐charge‐transfer (MLCT) transitions that are already present. The electronic properties of such complexes, and consequently the magnitude and intensity of these transitions, can be modulated by various functional groups as well as environmental factors, affording control over the color and luminescence. The responsive behavior of these complexes makes them attractive candidates for chromic devices with applications in memory, encryption, sensors, and optoelectronics. This Minireview summarizes the mechanisms and reversibility of optical chromism in platinum(II) complexes, with a focus on the recent developments in the literature.

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Chemo-chromism in an orthogonal dabco-based Co(ii) network assembled by methanol-coordination and hydrogen bond formation

Cited by 9 publications

References 23 publications

Layer or Tube? Uncovering Key Factors Determining the Rolling-up of Layered Coordination Polymers

Layer or Tube? Uncovering Key Factors Determining the Rolling-up of Layered Coordination Polymers

Fast continuous measurement of synchrotron powder diffraction synchronized with controlling gas and vapour pressures at beamline BL02B2 of SPring-8

Chromic Platinum Complexes Containing Multidentate Ligands

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