Synthesis and Optical Properties of Layered Inorganic-Imidazoline Monoliths

Fujii, Kazuko; Hashizume, Hideo; Shimomura, Shigeru; Wakahara, Takatsugu; Ando, Toshihiro

doi:10.1007/s10904-018-1048-8

Cited by 6 publications

(10 citation statements)

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“…The XRD peak was observed at a low angle (d = 1.8 nm) for LIIm ( Figure 2 e) and is attributed to the interlayer distance, including the layer thickness and gallery height between the inorganic moieties of LIIm ( Scheme 1 ) [ 30 ]. The XRD peak was not observed for the polyFe/LIIm composite-3/0.1 ( Figure 2 a) and barely observed for the polyFe/LIIm composite-3/0.5 ( Figure 2 b).…”

Section: Resultsmentioning

confidence: 99%

“…We should note that the absorption of Ni(II) of LIIm should be overlapped on the absorption at ~385 nm. The broad absorption peaks appear at ~390 nm and 685 nm and are attributed to d–d transitions 3 A 2g → 3 T 1g (P) and 3 A 2g → 3 T 1g (F) of Ni(II) for LIIm [ 30 ]. The UV-vis spectrum demonstrated a tailing for the MLCT band of the polyFe/LIIm composite-3/5 in a longer wavelength side ( Figure 3 d).…”

Section: Resultsmentioning

confidence: 99%

“…A layered inorganic–imidazoline covalently bonded hybrid (LIIm, Scheme 1 ) was synthesized as per a previous report [ 30 ]. Nickel (II) acetate tetrahydrate (Ni(CH 3 COO) 2 ·4H 2 O, >99.9%, FujiFilm-Wako Pure Chemical Industries, Tokyo, Japan) and triethoxy-3-(2-imidazoline-1-yl)propyl silane (C 12 H 26 N 2 O 3 Si, ≥97%, Sigma-Aldrich) reacted at 150 °C for six days.…”

Section: Methodsmentioning

confidence: 99%

“…After the reaction, the crude products were washed with purified water several times before being freeze dried. The synthesized LIIm was characterized using inductively coupled plasma optical emission spectrometry (ICP-OES), CHN analysis, thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible-near-infrared (UV-VIS-NIR) spectroscopy, and fluorescence spectrophotometry, which are all described in detail in [ 30 ]. These results have led to a proposed model for LIIm, which is a layered structure comprising inorganic layers with an imidazolyl group sandwiched between them, with an interlayer distance of 1.8 nm.…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, we focused on preparing nanocomposites of MSPs and inorganic materials without intercalation. In this study, we chose a layered inorganic–imidazoline covalently bonded hybrid (LIIm) [ 30 ] as the inorganic material. As LIIm has imidazoline moieties covalently immobilized between inorganic layers, it is expected to prevent the undesirable intercalation of MSPs in composites.…”

Section: Introductionmentioning

confidence: 99%

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Nanocomposites of Fe(II)-Based Metallo-Supramolecular Polymer and a Layered Inorganic–Organic Hybrid for Improved Electrochromic Materials

et al. 2022

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Fe-based metallo-supramolecular polymer (polyFe), composed of Fe(II) ions and bis(terpyridyl)benzene, is known as a good electrochromic (EC) material. For the first time, to improve the EC properties, we prepared nanocomposites comprising polyFe and a layered inorganic–imidazoline covalently bonded hybrid (LIIm) by simply mixing them in methanol and then examined the effect of the nanocomposition on EC properties. The obtained blue/purple-colored composites (polyFe/LIIm composites) were demonstrated by scanning electron microscopy (SEM) to comprise a structure of LIIm nanoparticles coated with amorphous polyFe. Interestingly, X-ray diffraction (XRD) measurements suggested that there was no intercalation of polyFe in the interlayer space of LIIm. Ultraviolet-visible (UV-vis) spectroscopy measurements demonstrated that light absorption close to 600 nm was attributed to metal-to-ligand charge transfer (MLCT) from the Fe(II) ion to the bisterpyridine ligand and was influenced by LIIm in the composites. The composites exhibited a pair of redox waves, assigned to the redox between Fe(II) and Fe(III), in the cyclic voltammograms; moreover, the composites were estimated to be diffusion controlled. Thin composite films demonstrated reversible EC changes, triggered by the redox reaction of the metal. Furthermore, the results show that the nano-scale composition of the metallo-supramolecular polymers with LIIm can effectively improve the memory properties without reducing the contrast in transmittance (ΔT) of 70–76% in EC changes after applying 1.2 V vs. Ag/Ag+. The EC properties varied with varying ratios (3/0.1, 0.5, 1, and 5) of the polyFe/LIIm, and the ratio of 3/1 exhibited the longest memory and largest MLCT absorption peak among composites. The results show that the polyFe/LIIm composites are useful EC materials for dimming glass applications, such as smart windows.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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