Molecular design confirmation for proposition of improved photophysical properties in a dye-intercalated layered double hydroxides

Rad, Farzad Arjomandi; Rezvani, Zolfaghar; Khodam, Fatemeh

doi:10.1039/c5ra19209a

Cited by 18 publications

(8 citation statements)

References 87 publications

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“…A similar type of supramolecular arrangement may be present in the intercalated material CR‐LDH, as represented in Figure a. This type of face‐to‐face arrangement can be classified as a H‐type aggregate and has been proposed for a number of dye‐intercalated materials such as LDHs containing Acid Red 27 and 9‐fluorenone‐2,7‐dicarboxylate . By rotating/twisting each CR molecule in this model by about 90° along the molecular axis we arrive at the alternative model represented in Figure b in which the CR molecules are stacked in a slipped coplanar inclined configuration.…”

Section: Resultsmentioning

confidence: 67%

Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State

et al. 2017

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Steady-state and time-resolved absorption and fluorescence measurements are reported for Congo Red (CR) in aqueous and dimethylsulfoxide (DMSO) solutions. The very low fluorescence quantum yield (≈10 ) for CR in dilute solutions together with the absence of a triplet state indicates that internal conversion is the dominant deactivation route with more than 99.99 % of the quanta loss (attributed to the energy gap law for radiationless transitions). Although no direct evidence for trans-cis photoisomerization was obtained from absorption or fluorescence data, the global analysis of fs-transient absorption data indicates the presence of a photoproduct with a lifetime of ≈170 ps that is suggested to be associated with such a process. Spectral data for more concentrated CR solutions indicate the presence of oblique or twisted J-type aggregates. These results are compared with spectra for CR in the solid state (sodium salt) and intercalated in a layered double hydroxide via a one-step co-precipitation route. Powder XRD and electronic spectral data for the nanohybrid indicate that the CR guest molecules are intercalated as a monolayer consisting of slipped cofacial J-type aggregates.

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Section: Resultsmentioning

confidence: 67%

Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State

et al. 2017

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“…Such control-embedded hybrid materials could open up exciting new horizons in designing novel functional nanodevices. 10 − 12 …”

Section: Introductionmentioning

confidence: 99%

“…In addition, we may imagine hybrid materials in which the photoresponsive organic component is embedded in an inorganic matrix in such an intimate way that the photostimulated change in, e.g., the size of the photoresponsive organics would switch on an action in the inorganic host material. Such control-embedded hybrid materials could open up exciting new horizons in designing novel functional nanodevices. − …”

Section: Introductionmentioning

confidence: 99%

Reversible Photoswitching Function in Atomic/Molecular-Layer-Deposited ZnO:Azobenzene Superlattice Thin Films

Khayyami

Karppinen

2018

Chem. Mater.

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We report new types of reversibly photoresponsive ZnO:azobenzene superlattice thin films fabricated through atomic/molecular-layer deposition (ALD/MLD) from diethylzinc, water, and 4,4′-azobenzene dicarboxylic acid precursors. In these ultrathin films, crystalline ZnO layers are interspersed with monomolecular photoactive azobenzene dicarboxylate layers. The thickness of the individual ZnO layers is precisely controlled by the number (m) of ALD cycles applied between two subsequent MLD cycles for the azobenzene layers; in our {[(Zn–O)m+(Zn–O2–C–C6H4–N=N–C6H4–C–O2)]n+(Zn–O)m} samples, m ranges from 0 to 240. The photoresponsive behavior of the films is demonstrated with ultraviolet–visible spectroscopy; all the films are found to be photoreactive upon 360 nm irradiation, the kinetics of the resultant trans–cis photoisomerization somewhat depending on the superlattice structure. The reversibility of the photoisomerization reaction is then confirmed with a subsequent thermal treatment. Our work thus provides proof-of-concept evidence of the suitability of the ALD/MLD technology for the implementation of photoactive moieties such as azobenzene within an inorganic matrix as an attractive new methodology for creating novel light-switchable functional materials.

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“…The spectrum of the used ZIF-67 is almost the same to that of the pristine ZIF-67, indicating that the functional groups and bonds of ZIF-67 were retained after the adsorption. However, a noticeable peak at 1050 cm À1 can be detected in the spectrum of the used ZIF-67; the peak corresponds to the S¼O symmetric stretching vibration of the sulfonate group, derived from the signature peak of AMR (Rad et al, 2016), validating that AMR was indeed adsorbed to ZIF-67.…”

Section: Resultsmentioning

confidence: 77%

Efficient Adsorptive Removal of Toxic Amaranth Dye from Water using a Zeolitic Imidazolate Framework

Lin¹,

Wu²

2018

Water Environment Research

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Adsorbents reported to remove a toxic acidic azo dye, Amaranth (AMR) are very limited, and their typical adsorption capacities are quite low. Recently, a zeolitic imidazolate framework (ZIF-67) has been proposed as a novel adsorbent as ZIF-67 possesses high surface area, superior chemical stability in water and positive charges, making it a promising adsorbent for AMR. Nevertheless, no studies have been conducted to investigate the adsorption of AMR to ZIF-67. Herein, ZIF-67 is employed for the first time to remove AMR from water via adsorption. Adsorption behaviors are investigated via determining the adsorption kinetics and isotherm. ZIF-67 also exhibits a significant higher maximum adsorption capacity (qmax = 121 mg g-1 at 30 °C) than most of the reported adsorbents. ZIF-67 can be also regenerated by washing it with NaCl solutions and the regeneration efficiency remains effective over multiple cycles, demonstrating that ZIF-67 is a promising adsorbent for AMR.

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Molecular design confirmation for proposition of improved photophysical properties in a dye-intercalated layered double hydroxides

Abstract: In the present research, Zn2Al layered-double hydroxide (LDH) intercalated with Acid Red 27 was prepared by coprecipitation method, while solutions of Zn(ii) and Al(iii) nitrate salts reacted with an alkaline solution of Acid Red 27.

Cited by 18 publications

References 87 publications

Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State

Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State

Reversible Photoswitching Function in Atomic/Molecular-Layer-Deposited ZnO:Azobenzene Superlattice Thin Films

Efficient Adsorptive Removal of Toxic Amaranth Dye from Water using a Zeolitic Imidazolate Framework

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