Spectroscopic studies of fullerene clusters in N -methyl-2-pyrrolidone

Naumenko, A. P.; Biliy, M.M.; Gubanov, V. O.; Navozenko, A.

doi:10.1016/j.molliq.2017.01.035

Cited by 6 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, exfoliation yield and optical absorbance of NMP have also been acknowledged to vary with the age of the solvent 11 . Optical spectroscopy of NMP dispersions is further complicated, albeit rarely acknowledged in the literature on nanomaterials, by weak photoluminescence (PL) of the solvent 14 , 15 . We have observed the enhancement of this PL with degradation, with an increase in the overall intensity and the influence of a redshifted component in both aged, untreated samples and sonicated samples.…”

Section: Introductionmentioning

confidence: 99%

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Ogilvie

Large

Fratta

et al. 2017

Sci Rep

View full text Add to dashboard Cite

N-methyl-2-pyrrolidone (NMP) has been shown to be the most effective solvent for liquid phase exfoliation and dispersion of a range of 2D materials including graphene, molybdenum disulphide (MoS2) and black phosphorus. However, NMP is also known to be susceptible to sonochemical degradation during exfoliation. We report that this degradation gives rise to strong visible photoluminescence of NMP. Sonochemical modification is shown to influence exfoliation of layered materials in NMP and the optical absorbance of the solvent in the dispersion. The emerging optical properties of the degraded solvent present challenges for spectroscopy of nanomaterial dispersions; most notably the possibility of observing solvent photoluminescence in the spectra of 2D materials such as MoS2, highlighting the need for stable solvents and exfoliation processes to minimise the influence of solvent degradation on the properties of liquid-exfoliated 2D materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Ogilvie

Large

Fratta

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…According to the literature, liquid NMP demonstrates a two-band emission at 350 and 370 nm (λ Ex = 270 nm) . Hence, we can propose excitation of NMP at 270 nm and its emission near 350–370 nm, which overlaps with excitation of the Ag-based luminescent center maximum at 390 nm (Figure ).…”

Section: Resultsmentioning

confidence: 68%

Self-Assembly of Ag⁺/[PW₁₁NbO₄₀]^4– Complexes in Nonaqueous Solutions

et al. 2020

View full text Add to dashboard Cite

Self-assembly between Ag+ and [PW11NbO40]4– in N- and O-donor solvents (nitriles and amides) has been studied. In the case of dimethylformamide (DMF), formation of a yellow [Ag4(DMF)12][PW11NbO40] (1a) metastable phase and a colorless [Ag4(DMF)10][PW11NbO40] (1) stable phase was observed. In acetonitrile (CH3CN), the product was [Ag(CH3CN)4]2{[Ag(CH3CN)3]2[PW11NbO40]} (2a). By contrast, [SiW12O40]4– of the same size and charge as [PW11NbO40]4– produces [Ag(CH3CN)3]4[SiW12O40] (3a). Partial desolvation of 2a and 3a leads to Ag4[PW11NbO40]·7.5CH3CN (2) and Ag4[SiW12O40]·7.5CH3CN (3), respectively. The CH3CN molecules in the structure of 2 are labile, and this compound was used as the starting material to study solvent-exchange processes in N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMA), diethylformamide (DEF), and benzonitrile (PhCN) solutions. These solvent reactions yield [Ag(DMA)4][Ag3(DMA)6][PW11NbO40] (4), [Ag2(NMP)4(CH3CN)]2[PW11NbO40]·1.3NMP (5a), [Ag2(NMP)5]2[PW11NbO40] (5b), Ag4[PW11NbO40]·9.5DEF (6), and [Ag(PhCN)4]2[{Ag(PhCN)3}2PW11NbO40] (7). All products were isolated and characterized by single-crystal X-ray diffraction (except for 2 and 3), IR, elemental analysis, and thermogravimetric analysis techniques. The O-donor solvents favor polynuclear, solvent-bridged cationic aggregates. In the case of DMF, DMA, and DEF discrete, tri- and tetranuclear polycations are observed, while in the case of NMP, the formation of infinite polycationic structures takes place. By contrast, the N-donor solvents (CH3CN and PhCN) favor mononuclear cations, which can exist either as distorted tetrahedral, isolated [Ag(Solv)4]+ cations or as pseudotriangular {Ag(Solv)3}+ units, additionally coordinated to a polyoxometalate. Screening of the luminescent properties for solid samples of 1–7 revealed that only 5a/5b and 7 are emissive. In particular, the sample containing 5a and 5b demonstrates long-lived phosphorescence with a 30 ms lifetime.

show abstract

“…In some studies, initial solutions for investigation of the NMP-toluene systems were prepared either in toluene or in both polar and "good" nonpolar solvents [140,[143][144][145]. Fullerene C60 and C70 solutions in N-methylpyrrolidine-2-one, NMP ( r ε = 32), are a special case [17,21,[125][126][127][134][135][136][137][138][139][140][141][142][143][144][145][146][147][148]. While dilution of fullerene solutions in toluene, benzene, or CS2 by acetonitrile, acetone, or alcohols is quite understandable from the point of view of colloid chemistry as an example of "bottom-up" preparation, the "top-down" preparation of fullerene colloids in the last "poor" solvents needs sonication.…”

Section: "Top-down" Preparation Of Organosols and Suspensionsmentioning

confidence: 99%

“…In other cited papers, the fullerene solutions were prepared directly by stirring the solid sample in NMP. The stirring time varied from 10-15 min [138,140,143,146,147] to 1 h [136,139,144], 6 h [141], 24 h [127] or four days [135]. In some studies, initial solutions for investigation of the NMP-toluene systems were prepared either in toluene or in both polar and "good" nonpolar solvents [140,[143][144][145].…”

Section: "Top-down" Preparation Of Organosols and Suspensionsmentioning

confidence: 99%

“…The main specific feature is the strong interaction between the fullerene and solvent molecules. Obviously, it is a kind of donor-acceptor interaction, which results in formation of charge transfer complexes [139,141,144,147] proved by the 1 H NMR spectroscopy, quantum-chemical calculations [139,144], and mass spectra [135,144]. Another property is ageing of fullerene solutions over time, slow increasing in size up to ca.…”

Section: "Top-down" Preparation Of Organosols and Suspensionsmentioning

confidence: 99%

See 1 more Smart Citation

Colloid Chemistry of Fullerene Solutions: Aggregation and Coagulation

Mchedlov-Petrossyan,

Marfunin,

Kriklya

2023

Liquids

View full text Add to dashboard Cite

This review article is devoted to the colloidal properties of fullerene solutions. According to generally accepted understandings, all solvents in relations to fullerenes are divided into “good”, “poor”, and “reactive”. We have consistently considered the state of fullerenes in these systems. In “good”, predominantly non-polar aromatic solvents and CS2, non-equilibrium dissolution methods lead to the formation of colloidal aggregates, whereas the utilization of equilibrium methods results in the formation of molecular solutions. The latter, however, have some unusual properties; new results considered in this review confirm previously expressed ideas about colloidal properties of these solutions. In “poor” (polar) solvents, lyophobic colloidal systems appear. Both “bottom-up” and “top-down” methods of preparation are well documented in the literature. However, N-methylpyrrolidine-2-one, DMSO, and DMF dissolve fullerenes quite easily and with less energy consumption. These solvents can be considered a subset of “poor” solvents that have some features of being “reactive” at the expense of basic properties. New data confirm that hydrosols of fullerenes are typical hydrophobic colloids that obey the Schulze–Hardy rule and other regularities in the presence of electrolytes. Organosols in acetonitrile and methanol are much less stable with respect to the effects of electrolytes. This allows us to assume a non-DLVO stabilizing factor in the hydrosols. Accordingly, a new estimate of the Hamaker constant of fullerene–fullerene interaction is proposed. In DMSO and DMF, the coagulation of fullerene sols is hindered due to strong solvation with these basic solvents.

show abstract

Spectroscopic studies of fullerene clusters in N -methyl-2-pyrrolidone

Cited by 6 publications

References 31 publications

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Self-Assembly of Ag⁺/[PW₁₁NbO₄₀]^4– Complexes in Nonaqueous Solutions

Colloid Chemistry of Fullerene Solutions: Aggregation and Coagulation

Contact Info

Product

Resources

About

Spectroscopic studies of fullerene clusters in N -methyl-2-pyrrolidone

Cited by 6 publications

References 31 publications

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

Self-Assembly of Ag+/[PW11NbO40]4– Complexes in Nonaqueous Solutions

Colloid Chemistry of Fullerene Solutions: Aggregation and Coagulation

Contact Info

Product

Resources

About

Self-Assembly of Ag⁺/[PW₁₁NbO₄₀]^4– Complexes in Nonaqueous Solutions