Selective detection of Cr(vi) in aqueous media by carbazole-based fluorescent organic microcrystals

Upamali, Karasinghe A. N.; Estrada, Leandro A.; Neckers, Douglas C.

doi:10.1039/c1ay05255a

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…Fluorescence signals offer high selectivity, sensitivity, real‐time detection, nondestructive determination, and low‐cost instrumentation. As a consequence, a number of CS‐based chemosensors have been developed to reveal certain cations, ranging from reversible pH fluorescence probes[112b,142] to harmful cations such as Cr(IV) but more commonly for Hg(II). Mercury and its ions, have long been identified as being among the most toxic heavy metal species and persistent contaminants.…”

Section: Nanostructuresmentioning

confidence: 99%

Self‐Assembled α‐Cyanostilbenes for Advanced Functional Materials

2017

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In the specific context of condensed media, the significant and increasing recent interest in the α-cyanostilbene (CS) motif [ArCHC(CN)Ar] is relevant. These compounds have shown remarkable optical features in addition to interesting electrical properties, and hence they are recognized as very suitable and versatile options for the development of functional materials. This progress report is focused on current and future use of CS structures and molecular assemblies with the aim of exploring and developing for the next generations of functional materials. A critical selection of illustrative materials that contain the CS motif, including relevant subfamilies such as the dicyanodistyrylbenzene and 2,3,3-triphenylacrylonitrile shows how, driven by the self-assembly of CS blocks, a variety of properties, effects, and possibilities for practical applications can be offered to the scientific community, through different rational routes for the elaboration of advanced materials. A survey is provided on the research efforts directed toward promoting the self-assembly of the solid state (polycrystalline solids, thin films, and single crystals), liquid crystals, nanostructures, and gels with multistimuli responsiveness, and applications for sensors, organic light-emitting diodes, organic field effect transistors, organic lasers, solar cells, or bioimaging purposes.

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Section: Nanostructuresmentioning

confidence: 99%

Self‐Assembled α‐Cyanostilbenes for Advanced Functional Materials

2017

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“…Tang and coworkers interpreted this phenomenon as the phenyl rotators (whose free rotation could release the energy) are hindered in the aggregation state by the formation of π‐π interaction. Such abnormal AIE effect has been used in many fields like chemical sensor, stress sensor, explosive detection, and biosensors…”

mentioning

confidence: 99%

Memory chromic polyurethane with tetraphenylethylene

Huang

et al. 2013

J Polym Sci B Polym Phys

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This article reports a chromic polymer, which is responsive to its shape memory properties and has both the behavior of shape memory polymers and chromic materials. We employed a strategy to fabricate such a smart material, which represents a new principle for making chromic materials. This material is made of shape memory polyurethane with tetraphenylethylene units (0.1 wt %) covalently connected to the soft-segments (PCL, M w 5 4000). The material displays biocompatibility, shape fixity of 88-93%, and almost 100% shape recovery and has reversible mechanochromic, solvatochromic, and thermochromic shape memory effect. The memory chromism represented by the reversible change of emission intensity shows negative correlation with shape fixity, temperature, and existence of solvent. It may be explained that when the soft segments are molten or dissolved in solvent, the shape recovery switch is open, the AIE units are free from crystal binding and can migrate easily to larger areas, thus the AIE units/particles are far apart from each other and the barrier for rotation of phenyl groups is reduced, which lead to the reduction of emission intensity, appeared by no colors or pale colors, and vice versa. Since the switch is a fundamental structural character of SMPs, the shape memory properties have led to the chromism and we call this memory chromic. Shape memory polymers (SMPs) are one group of the most promising smart materials and have drawn increasing interests because of their great potential in different applications such as sensors, actuators, biomedical devices, and textiles. [1][2][3][4][5][6][7][8] Typical SMPs have networks realized by the formation of well separated hard and soft phases. The hard phase acts as netpoints, which determine the permanent shape while the soft phase as the switch and can immobilize the temporary shape with different transition stimuli. Take the thermal sensitive SMPs as an example: when they are deformed above the transition temperature (T trans ) of soft segments and then cool down, the network will be fixed and the internal stress will be stored (such process is called programming). Upon heating to T trans or above, the internal stress will be released which enables the recovery of the polymer to the origin shape. With the rapid development of SMPs, recent research interest moves to the integration of SMPs with additional functions such as biodegradability, drug release, and thermochromism.

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“…The NS CDs and Cr(VI), 1.096 × 10 13 L mol -1 sec -1 . The literature reported that the value of K q is less than 2 × 10 10 L mol -1 sec -1 for dynamic quenching, while the higher values suggest static quenching 44 Such interactions between CDs and Cr(VI) have been reported in literature 45 A successively nitrogen and sulfur co-doped carbon dots as a nanosensor was synthesized by hydrothermal method using simple carbon, nitrogen, and sulfur sources. The designed nanosensor was productively used for Cr(VI), ascorbic acid, and Metanil yellow fluorescence sensing.…”

Section: Sensitive and Selective Detection Of Ascorbic Acidmentioning

confidence: 53%

“…The literature reported that the value of K q is less than 2 × 10 10 L mol −1 s −1 for dynamic quenching, while the higher values suggest static quenching. 44 Such interactions between CDs and CrĲVI) have been reported in the literature. 45,46 However, the fluorescence decay profile of the NS CDs in the absence and presence of CrĲVI) did not change.…”

Section: Sensitive and Selective Detection Of Metanil Yellowmentioning

confidence: 68%