Nanocomposites of carbon quantum dots–nickel(ii) dithiolene as nanolights

Begum, Ameerunisha; Sonkar, Sumit Kumar; Saxena, Manav; Sarkar, Sabyasachi

doi:10.1039/c1jm14073f

Cited by 15 publications

(16 citation statements)

References 31 publications

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“…The SEM images of nanoflowers of 2 displayed in Figure 2 indicate the assembly of the nanospheres into flowery architectures. The transition metal dithiolenes are known to form nanospheres upon recrystallization from H 2 O/CH 3 CN on a brass matrix,5 but in DMF, these nanospheres further reorganize themselves to form nanostructures resembling flowers of four petals as shown in Figure 2. The molecular structures of platinum and gadolinium complexes 1 and 2 , shown in Figure 1 and Scheme , are prone to hydrogen‐bonding interactions with water through the nitrogen atoms of the terminal CN groups.…”

Section: Resultsmentioning

confidence: 99%

“…Details of preparation, characterization of 1 and 2, ÀCOOH functionalization of the CNTs, single-crystal X-ray crystallographic measurement of 1, formation of nanospheres of 1, nanoflowers of 2, composites 3 and 4 with f-CNTs, high-resolution SEM images of 3, EDX spectra of 1 and 3, powder X-ray diffraction patterns of 3, and the crystallographic information file of 1 are given in the Supporting Information. Crystal structure data for 1: C 56 H 40 N 4 P 2 PtS 4 ; M r = 1154.19; monoclinic; P21/n; a = 11.267(5), b = 15.066 (5), c = 14.127(5) (); b = 98.213(5)8; volume = 2373.4(16) 3 ; Z = 2; 1 calcd = 1.615 Mg m À3 ; m(Mo Ka ) = 3.244 mm À1 ; F(000) = 1152; unique reflections, 13159 at 120 K, observed reflections, 4656; parameters, 304; GOF = 1.062; R 1 = 0.0423, wR 2 = 0.1165. CCDC-870916 contains the supplementary crystallographic data for this paper.…”

Section: Methodsmentioning

confidence: 99%

“…[4] We have recently reported a wide range of photoluminescent properties for a nanocomposite of nickel(II) dithiolene and functionalized carbon quantum dots (f-CQDs). [5] On doping with f-CQDs, the non-luminescent nanospheres of nickel(II) dithiolene form nanocomposites that show photoluminescence over a wide range, depending on the size of the CQD used. Although there are several reports on the near infra-red (NIR) absorption around l = 700-1100 nm and NIR photoluminescence at l = 1000-1400 nm of pristine single-walled CNTs, the photoluminescence of CNT-containing composites in the visible region have not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…We have recently reported a wide range of photoluminescent properties for a nanocomposite of nickel(II) dithiolene and functionalized carbon quantum dots (f‐CQDs) 5. On doping with f‐CQDs, the non‐luminescent nanospheres of nickel(II) dithiolene form nanocomposites that show photoluminescence over a wide range, depending on the size of the CQD used.…”

Section: Introductionmentioning

confidence: 99%

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Water‐Induced Formation, Characterization, and Photoluminescence of Carbon Nanotube‐Based Composites of Gadolinium(III) and Platinum(II) Dithiolenes

Begum

Tripathi

Sarkar

2014

Chemistry A European J

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Understanding the nature of interactions of targeted drug-delivery vehicles, such as functionalized carbon nanotubes (f-CNTs) and their composites, with a cell or its organelles or DNA, where water is a major constituent, requires molecular-level understanding of f-CNTs with analogous chemical systems. The nature of interaction has not yet been explored within the scope of formation of giant aggregates by self-assembly processes. Crystals of platinum(II) dithiolene [Pt(mnt)2 ][PPh4 ]2 (1) and gadolinium(III) dithiolene [Gd(mnt)3 ][PPh4 ]3 (2) (mnt=maleonitrile dithiolate) form nanospheres (diameter 88 nm) and nanoflowers (400-600 nm) in acetonitrile/water and DMF/water solvent mixtures, respectively. The formation of nanospheres or nanoflowers is proposed to be a water-induced phenomenon. These nanospheres and nanoflowers interact with f-CNTs by forming either spherical supramolecular assemblies (3, diameter up to 45. 5 μm) in the case of platinum(II) dithiolene or composite flowers (4) with CNT buckling for gadolinium(III) dithiolene. Both nanostructures, (3) and (4), show emission upon excitation at a range of wavelengths (λex =385-560 nm). The fluorescence emissions of the composite materials 3 and 4 are proposed to be due to separation of energy states of the nanospheres of 1 or the nanoflowers of 2 by the energy states of the f-CNTs, leading to the possibility of new electronic transitions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water‐Induced Formation, Characterization, and Photoluminescence of Carbon Nanotube‐Based Composites of Gadolinium(III) and Platinum(II) Dithiolenes

Begum

Tripathi

Sarkar

2014

Chemistry A European J

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“…28,29 Recently Sarkar and coworkers have documented several cost effective and simple synthetic methods for the synthesis of different versions of water soluble nano-carbons through varying the oxidative treatment. [30][31][32][33][34][35][36][37][38][39] In this work, we demonstrated the isolation of water soluble carbon nanotubes (wsCNTs) with network structure possessing multipodal junctions from waste carbon soot obtained during the synthesis of fullerene from our homemade reactor. Furthermore its interesting magnetic properties due to such junction structures of wsCNTs have been discussed.…”

Section: Introductionmentioning

confidence: 99%

Isolation of water soluble carbon nanotubes with network structure possessing multipodal junctions and its magnetic property

et al. 2013

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Water soluble carbon nanotubes (wsCNTs) with network structure possessing multipodal junctions were isolated by the oxidative treatment of carbon soot (generally discarded as waste during fullerene synthesis) using dilute nitric acid as black crystalline solid. wsCNTs having multipodal junctions are highly soluble in water due to the incorporation of adequate amount of hydrophilic carboxylic acid groups. Microscopic investigation shows the presence of extensive networked wsCNTs possessing different types of junctions such as tri (''Y'', ''T''), tetrapodal, pentapodal and even ''H'' type junctions. Furthermore these wsCNTs possessing interesting magnetic properties due to presence of multipodal junctions and defective surfacial structures, usually known as surfacial 'defects' on graphitic pool (sp 2 hybridized carbon atoms) of nanotubes. Easy solubility along with magnetic properties makes these wsCNTs to be used as a potential probe for their use in biological and spintronic applications respectively.

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An Electrochemical Sensor Based on Carbon Quantum Dots and Ionic Liquids for Selective Detection of Dopamine

et al. 2023

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Dopamine (DA) as a neurotransmitter has a pivotal role in the central nervous system. Because of altered levels of DA in various neuroscience diseases, development of a quick, sensitive, and simple analytical approach to determine DA in biological fluids could be very applicable. In this research, a novel electrochemical sensor based on a carbon paste electrode (CPE) modified with ionic liquid (IL) and carbon quantum dots (CQDs) for measuring DA with uric acid and ascorbic acid was developed. IL and CQDs were synthesized and characterized for their specific properties such as composition, emission, size distribution, and morphology structure.Then, the modified CPE and different DA concentration was determined via cyclic voltammetry. The modified electrode exhibited great electrocatalytic activity for DA oxidation. Under optimal conditions, the calibration diagram for DA was linear within the range of 0.1-50 μM in phosphate buffer (pH = 7.4) and limit of detection was 0.046 μM. The electrode was successfully used in the determination of DA in real samples and generated acceptable outputs. The proposed electrochemical sensor could be an exceptional step forward in DA detection and pave the way for the molecular diagnosis of neurological illnesses.

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Nanocomposites of carbon quantum dots–nickel(ii) dithiolene as nanolights

Cited by 15 publications

References 31 publications

Water‐Induced Formation, Characterization, and Photoluminescence of Carbon Nanotube‐Based Composites of Gadolinium(III) and Platinum(II) Dithiolenes

Water‐Induced Formation, Characterization, and Photoluminescence of Carbon Nanotube‐Based Composites of Gadolinium(III) and Platinum(II) Dithiolenes

Isolation of water soluble carbon nanotubes with network structure possessing multipodal junctions and its magnetic property

An Electrochemical Sensor Based on Carbon Quantum Dots and Ionic Liquids for Selective Detection of Dopamine

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