Microwave-assisted solid state intercalation of Rhodamine B and polycarbazole in bentonite clay interlayer space: structural characterization and photophysics of double intercalation

Riaz, Ufana; Ashraf, S. M.; Saroj, Sanjay Kumar; Zeeshan, Mohd; Jadoun, Sapana

doi:10.1039/c5ra27387k

Cited by 19 publications

(4 citation statements)

References 33 publications

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“…Poly(carbazole) (PCz) has been rigorously investigated for its optoelectronic properties which are applicable in hole transporting devices. 25 As an organic material, PCz has many advantages because it is inexpensive and can be modulated without increasing steric hindrance near the backbone. Moreover, nitrogen atom can be easily functionalized with a large variety of substituents.…”

Section: Introductionmentioning

confidence: 99%

Tuning the spectral, thermal and fluorescent properties of conjugated polymers via random copolymerization of hole transporting monomers

2017

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Section: Introductionmentioning

confidence: 99%

Tuning the spectral, thermal and fluorescent properties of conjugated polymers via random copolymerization of hole transporting monomers

2017

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“…Solutions of dyes prepared in water in the presence/absence of polymers were measured at concentrations of 10 −5 M while that of polymers was measured in 10 −3 M. Life time measurements were recorded on Edinburgh FL920 Fluorescence Life Time Spectrometer and data was analyzed using FAST Software. Fluorescence decay constant, k f , intrinsic fluorescence decay constant, k f 0 , internal conversion constant, k IC , were all determined from decay time (τ) values 22 .…”

Section: Characterizationmentioning

confidence: 99%

Spectroscopic and Biophysical Interaction Studies of Water-soluble Dye modified poly(o-phenylenediamine) for its Potential Application in BSA Detection and Bioimaging

Riaz

Ashraf

Jadoun

et al. 2019

Sci Rep

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Ultrasound-assisted synthesis of water soluble poly(o-phenylenediamine) (POPD) and its doping with Acid Orange (AO), Fluorescein (Fluo) and Rhodamine-6G (R6G) dyes was carried out with a view to enhance the photophysical properties of POPD. XPS studies confirmed that doping of POPD occured through hydrogen bonding between NH group of POPD and C=O/SO − , S=O groups of the dyes. The presence of strong hydrogen bonding was also confirmed via UV-vis studies by the addition of urea and sodium chloride to the dye modified POPD adducts. Molar extinction coefficient of these adducts was found to bear a close relationship with the molecular structure. Fluorescence life time, (τ f, ) was found to be lowest (1.8 ns) for AO-POPD and highest (3.2 ns) for Fluo-POPD. The structure of AO-POPD was more strained, while that of Fluo-POPD was least strained. Intrinsic fluorescence decay constant, (k 0 f ) showed increasing values for POPD, AO-POPD, Fluo-POPD, R6G-POPD as 0.071, 0.072, 0.153, and 0.172 (10 8 s −1 ), which could be correlated to the increasing strain-free molecular structure of the adducts. Circular dichroism spectra (CD) of BSA in presence of POPD and R6G- POPD revealed that it partially broke its helical structure, while Fluo-POPD and AO-POPD showed enhancement in the helical content. The 3-D fluorescence studies confirmed enhancement in hydrophobicity of POPD and R6G- POPD and increase in hydrophylicity of AO-POP and Fluo-POPD in the microenvironment of tryptophan residue-213 of BSA. Fluo-POPD and R6G-POPD adducts were chosen to find out the lowest detection limit (LOD) of BSA by differential pulse voltammetry (DPV) which was found to be 1.35 nM, and 1.65 nM using Fluo-POPD and R6G -POPD respectively. The binding constant of BSA with Fluo-POPD- and R6G-POPD was obtained as 3.98 × 10 6 Lmol −1 and 5.27 × 10 2 Lmol −1 . These polymers could therefore, be used for the detection of BSA. Live cell imaging revealed that POPD nanoparticles were bound to the outer membrane of E . coli , while R6G-POPD, showed penetration into the cytoplasm and excellent labeling of E . coli . This facile technique could be used to design tunable biomarkers by tailoring the conjugated polymer with a desired dye molecule.

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“…[ 53,54 ] In 3D MOF materials, in situ guest encapsulation strategies are typically employed to overcome small pore apertures prohibiting dye diffusion. [ 52 ] In a 2D MON system, we theorize this encapsulation is analogous to intercalation, which has been achieved for RB and F in LDH systems and clays, [ 55,56 ] yet the resulting systems are frequently reported as being unstable or lack tuneability. [ 57,58 ] The intercalation of organic fluorophores is yet to be explored in MONs, despite the apparent advantages of a more flexible and customizable parent matrix to control loading and tune interlayer spacing.…”

Section: Introductionmentioning

confidence: 99%

Guest Entrapment in Metal‐Organic Nanosheets for Quantifiably Tuneable Luminescence

Sherman

Gutiérrez

Griffiths

et al. 2023

Adv Funct Materials

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Luminescent metal‐organic frameworks (LMOFs) are promising materials for nanophotonic applications due to their tuneable structure and programmability. Yet, the 3D nature of LMOFs creates challenges for stability, optical transparency, and device integration. Metal‐organic nanosheets (MONs) potentially overcome these limitations by combining the benefits of metal‐organic frameworks (MOFs) with an atomically thin morphology of large planar dimensions. Herein, the bottom‐up synthesis of few‐layer thin ZIF‐7‐III MONs via facile low‐energy salt‐templating is reported. Employing guest@MOF design, the fluorophores Rhodamine B and Fluorescein are intercalated into ZIF‐7 nanosheets (Z7‐NS) to form light emissive systems exhibiting intense and highly photostable fluorescence. Aggregation and Förster resonance energy transfer, enabled by the MON framework, are revealed as the mechanisms behind fluorescence. By varying guest concentration, these mechanisms provide predictable quantified control over emission chromaticity of a dual‐guest Z7‐NS material and the definition of an “emission chromaticity fingerprint” – a unique subset of the visible spectrum that a material can emit by fluorescence.

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Microwave-assisted solid state intercalation of Rhodamine B and polycarbazole in bentonite clay interlayer space: structural characterization and photophysics of double intercalation

Abstract: Intercalation of organic moieties in layered double hydroxides/clays has been used to obtain various hybrid compounds with enhanced properties and wide ranging applications.

Cited by 19 publications

References 33 publications

Tuning the spectral, thermal and fluorescent properties of conjugated polymers via random copolymerization of hole transporting monomers

Tuning the spectral, thermal and fluorescent properties of conjugated polymers via random copolymerization of hole transporting monomers

Spectroscopic and Biophysical Interaction Studies of Water-soluble Dye modified poly(o-phenylenediamine) for its Potential Application in BSA Detection and Bioimaging

Guest Entrapment in Metal‐Organic Nanosheets for Quantifiably Tuneable Luminescence

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