Electrostatically-driven assembly of MWCNTs with a europium complex

Maggini, Laura; Traboulsi, Hussein; Yoosaf, K.; Mohanraj, John; Wouters, Johan; Pietraszkiewicz, Oksana; Pietraszkiewicz, Marek; Armaroli, Nicola; Bonifazi, Davide

doi:10.1039/c0cc02874f

Cited by 40 publications

(36 citation statements)

References 27 publications

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“…This assignment is in agreement with previously reported TGA observations for encapsulated Eu(III) complex and fullerene peapods, for which the entrapped material resulted characterized by a higher combustion temperature, as 30 compared to the free species because of the shielding effect of the CNTs sidewalls. [25,38] Before discussing the extent of the weight Fig. S5).…”

Section: Qualitative and Quantitative Characterization Of The Hybrid mentioning

confidence: 99%

“…To pursue our goal, we selected the bright tetrakis(2-naphtoyltrifluoro-acetonato) Eu(III) complex ([EuL 4 ]·NEt 4 ) [18a,30] 45 as a guest molecule. This negatively charged compound is known from literature to efficiently interact with imidazolium-based ionic liquids (ILs) [25,[31][32] through both electrostatic and cation-π interactions. Hence, we performed the synthesis of a C 60 derivative bearing an imidazolium appendage (1·Br) capable of of the luminescent module within the CNTs, but, more interestingly, it should also control the nano-structuration within the channel of CNTs with the fullerene moieties of each encapsulated assembly pointing in the same direction, insulating the LnCs.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, CNTs can be employed as nano-containers, nano-reactors, or as fillable 25 conductive nano-vessels, able to give rise to advanced hybrid graphitic materials utilizable in electronic devices. [4] The feasibility of the entrance of guest molecules within the inner channel of CNTs relies on the favorable establishment of a range of interactions between the "guest" molecules and the 30 "host" CNTs, [5] amongst which van der Waals forces often appear to be predominant.…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Among these, our group specifically developed new exohedral supramolecular functionalization methodologies with Eu(III)-based complexes. [25][26][27] [29] who demonstrated the effectiveness of using fullerenes as 40 vehicles for inserting transition metal complexes inside SWCNTs, we also decided to use C 60 to facilitate and direct the entrance of the LnC within the carbonaceous cavity. To pursue our goal, we selected the bright tetrakis(2-naphtoyltrifluoro-acetonato) Eu(III) complex ([EuL 4 ]·NEt 4 ) [18a,30] 45 as a guest molecule.…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Among these, our group specifically developed new exohedral supramolecular functionalization methodologies with Eu(III)-based complexes. [25][26][27] In particular, by means of electrostatic 25 interactions, negatively charged Eu(III) complexes were used to positively decorate charged multi-walled CNTs (MWCNTs) forming stable and luminescent hierarchized architectures.…”

Section: Introductionmentioning

confidence: 99%

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Fullerene-driven encapsulation of a luminescent Eu(iii) complex in carbon nanotubes

et al. 2014

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A novel CNT-based hybrid luminescent material was obtained via encapsulation of a C 60 -based Eu(III) complex into single-, double-and multi-walled carbon nanotubes (SWCNTs, DWCNTs and MWCNTs, respectively). Specifically, 10 a luminescent negatively-charged Eu(III) complex, electrostatically bonded to an imidazolium-functionalized fullerene cage, was transported inside CNTs by exploiting the affinity of fullerenes for the inner surface of these carbonaceous containers. The filling was performed under supercritical CO 2 (scCO 2 ) conditions to facilitate the entrapment of the ion-paired assembly. Accurate elemental, spectroscopic and morphological characterization not only demonstrated the efficiency of the filling strategy, but even the occurrence of a nano-ordering of the 15 encapsulated supramolecular luminophores when SWCNTs were employed. Preliminary confocal microscope imaging studies showed that these hybrids could have some potential for diagnostic applications. IntroductionAlong with an increase of the available methodologies for their manipulation, [1] and the development of atomic-resolution 20 visualization techniques, mainly high-resolution transmission electron microscopy (HRTEM), [2] current efforts in carbon nanotube (CNT) [3] research are directed towards the study and exploitation of their porous properties. Indeed, CNTs can be employed as nano-containers, nano-reactors, or as fillable 25 conductive nano-vessels, able to give rise to advanced hybrid graphitic materials utilizable in electronic devices.[4]The feasibility of the entrance of guest molecules within the inner channel of CNTs relies on the favorable establishment of a range of interactions between the "guest" molecules and the 30 "host" CNTs, [5] amongst which van der Waals forces often appear to be predominant. [6] These are maximized when the host-guest complex occurs between CNTs and related graphitic materials, [7] such as fullerenes, e.g. C 60 and C 70. In fact, the common nature of the two materials, together with the perfect geometrical match of 35 the shape of a fullerene and the inner nanotube surface of singlewalled CNTs (SWCNTs), results in a spontaneous encapsulation.[8]The use of CNTs as templating nano-containers has recently started to draw attention as a possible strategy for the synthesis of 40 novel highly organized photonic materials. It is well established that the emission properties of a chromophore, in terms of color and intensity, are extremely sensitive to the environment. [9] Encapsulation of luminophores within a protective "cage" (i.e. CNTs) might hence grant a sheltering effect from hostile reactive 45 species, as Yanagi et al. demonstrated with the encapsulation of β-carotene within SWCNTs, [12] allowing longer-lasting luminescence performances of the hosted molecules. Furthermore, molecular confinement in such a restrained space might induce a well-ordered mono-dimensional molecular constituents remained preserved.[20]Since then, different approaches to blend CNTs and LnCs have been reported. [21...

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Section: Qualitative and Quantitative Characterization Of The Hybrid mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Among these, our group specifically developed new exohedral supramolecular functionalization methodologies with Eu(III)-based complexes. [25][26][27] In particular, by means of electrostatic 25 interactions, negatively charged Eu(III) complexes were used to positively decorate charged multi-walled CNTs (MWCNTs) forming stable and luminescent hierarchized architectures.…”

Section: Introductionmentioning

confidence: 99%

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Fullerene-driven encapsulation of a luminescent Eu(iii) complex in carbon nanotubes

et al. 2014

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Anisotropically Luminescent Hydrogels Containing Magnetically‐Aligned MWCNTs‐Eu(III) Hybrids

et al. 2013

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The anisotropic emission properties of an Eu(III)-MWCNTs-based nanocomposite PNIPAAm hydrogel is induced upon application of a 10 T magnetic field, the latter dictating the alignment of the carbon nanotubes. This structuration creates directional highways for light to be preferentially absorbed, giving rise to orientation-dependent light emission intensity. Thermal control of the transparency of the aqueous matrix also allowed a stimulus-induced switching of the materials' emission properties.

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Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Wang

et al. 2014

Angewandte Chemie

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Stopper molecules attached to nanozeolite L (NZL) boost the luminescence of confined Eu 3+ -b-diketonate complexes. The mechanism that is responsible was elucidated by comparing two diketonate ligands of different pK a and two aromatic imines, and by applying stationary and time resolved spectroscopy. The result is that the presence of the imidazolium based stopper is favorable to the sustainable formation of Eu 3+ -b-diketonate complexes with high coordination by decreasing the proton strength inside the channels of NZL. A consequence is that strongly luminescent transparent films can be prepared using aqueous suspension of the stopper modified composites.

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Electrostatically-driven assembly of MWCNTs with a europium complex

Abstract: Luminescent carbon-based materials have been prepared by electrostatic self-assembly of negatively-charged luminescent Eu(III)-complex with imidazolium-functionalized MWCNTs.

Cited by 40 publications

References 27 publications

Fullerene-driven encapsulation of a luminescent Eu(iii) complex in carbon nanotubes

Fullerene-driven encapsulation of a luminescent Eu(iii) complex in carbon nanotubes

Anisotropically Luminescent Hydrogels Containing Magnetically‐Aligned MWCNTs‐Eu(III) Hybrids

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

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