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Search for "pyrene" in Full Text gives 25 result(s) in Beilstein Journal of Nanotechnology.
Molecular nanoarchitectonics: unification of nanotechnology and molecular/materials science
Beilstein J. Nanotechnol. 2023, 14, 434–453, doi:10.3762/bjnano.14.35
- ) backbones (Figure 7) [120]. First, silicon atoms were deposited on a Au(111) surface and annealed to form an AuSix film. Bromo-substituted polycyclic hydrocarbon precursors (triphenylene or pyrene) were then deposited on this surface and annealed to form a C4Si2 bridging network. In the linear structures
- obtained with pyrene precursors, the C4Si2 rings were converted to C4Si pentagonal siloles by further heat treatment. These results demonstrate that coupling nanoarchitectonics on C–Si surfaces is possible by depositing Si atoms and, subsequently, polycyclic hydrocarbons on Au(111). It is expected that
Cyclodextrins as eminent constituents in nanoarchitectonics for drug delivery systems
Beilstein J. Nanotechnol. 2023, 14, 218–232, doi:10.3762/bjnano.14.21
- mesoporous silica layer, pyrene molecules were connected by ester linkage, and β-CyD was added to form inclusion complexes with them. The inclusion complex was sufficiently bulky to block the release of drugs from the pores. NIR irradiation (980 nm) was converted to 340 nm light (and 475 nm light) by the
- upconversion nanoparticles, which in turn cleaved the covalent linkages between pyrene molecules and the mesoporous silica layer. As the result, the pores were unblocked and the encapsulated drugs were released. 3 CyD-based nanoarchitectures to deliver therapeutic nucleic acids to the target site Therapeutic
DNA aptamer selection and construction of an aptasensor based on graphene FETs for Zika virus NS1 protein detection
Beilstein J. Nanotechnol. 2022, 13, 873–881, doi:10.3762/bjnano.13.78
- . Following this concept, we functionalized multiple graphene field-effect transistor devices with ZIKV60 aptamers to demonstrate the feasibility of constructing graphene-based aptasensors for ZIKV NS1 protein detection. Importantly, these ZIKV60 aptamers feature a pyrene moiety for their direct
- ) functionalization with ZIKV60 aptamers. In this experiment, we used 100 mM PBS as electrolyte for gating. The π-conjugated units of the pyrene-modified ZIKV60 aptamers transfer electrons to graphene, resulting in the left-shift of the graphene transfer curve because of the aptamer adsorption. Several studies
- support this electron transfer from pyrene-modified molecules to graphene as the binding mechanism in π–π interactions between such compounds [35][36][37]. The association of pyrene-modified ZIKV60 aptamers with graphene may also be mediated by charge transfer that assists the interaction between the
Molecular assemblies on surfaces: towards physical and electronic decoupling of organic molecules
Beilstein J. Nanotechnol. 2021, 12, 950–956, doi:10.3762/bjnano.12.71
- otherwise only achieved for multilayers on the bare Ni. On hBN/Cu(111), Zimmermann et al. [87] could visualize the molecular orbitals of pyrene derivatives by STM at the submolecular level, while Brülke et al. [88] measured the fluorescence of monolayer perylenetetracarboxylic dianhydride (PTCDA), which is
Comprehensive review on ultrasound-responsive theranostic nanomaterials: mechanisms, structures and medical applications
Beilstein J. Nanotechnol. 2021, 12, 808–862, doi:10.3762/bjnano.12.64
Nanoporous and nonporous conjugated donor–acceptor polymer semiconductors for photocatalytic hydrogen production
Beilstein J. Nanotechnol. 2021, 12, 607–623, doi:10.3762/bjnano.12.50
- covalent organic frameworks (COFs) [34]. Notably, a record HER of up to 307 mmol·h−1·g−1 has been achieved with a pyrene–bithiophene-based porous polymer as the photocatalyst [35]. During PHP by water splitting, first, the photocatalyst is excited by photons, and photoexcited electrons hop into the lowest
- with oligophenylene moieties, which is due to the favorable internal polarization and coordinating sites rendered by nitrogen-containing heterocycles. Among them, the DTBDT–pyrazine-based P29 achieved the best HER of 106.9 μmol·h−1 (12 mg) due to the suitable N substitution. Pyrene as a well-known
- chromophore has been widely used in OLEDs and fluorescent probes due to its high photoluminescent quantum yield. Jiang et al. [57] introduced various sorts of nitrogen-containing fragments in pyrene-based polymers to investigate their photocatalytic performance, for example, P30 and P31 (Figure 4
Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)
Beilstein J. Nanotechnol. 2020, 11, 1470–1483, doi:10.3762/bjnano.11.130
- characterizing a family of pyridin-4-ylethynyl-functionalized pyrene derivatives in different environments. UV–vis measurements in toluene solutions revealed absorption at wavelengths consistent with density functional theory (DFT) calculations, while emission experiments showed a high fluorescence quantum yield
- . Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements of the pyrene derivatives adsorbed on a Cu(111)-supported hexagonal boron nitride (hBN) decoupling layer provided access to spatially and energetically resolved molecular electronic states. We demonstrate that the pyrene electronic gap
- -like-disubstituted derivatives governed the self-assembly of the pyrenyl core on the nanostructured hBN support, affording dense-packed arrays and intricate porous networks featuring a kagome lattice. Keywords: electronic structure; hexagonal boron nitride; optical properties; pyrene; self-assembly
Air oxidation of sulfur mustard gas simulants using a pyrene-based metal–organic framework photocatalyst
Beilstein J. Nanotechnol. 2019, 10, 2422–2427, doi:10.3762/bjnano.10.232
- , Evanston, IL 60208, USA Department of Chemical & Biological Engineering, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA 10.3762/bjnano.10.232 Abstract We demonstrate a microporous metal–organic framework NU-400 based on a 2,7-disubstituted pyrene linker as a highly efficient
- ’ half-life. This is a considerable improvement to NU-1000, based on a 1,3,6,8-tetrasubstituted pyrene unit, demonstrating how variation of the substitution pattern of a metal–organic framework linker permits modification of its photoactive behavior. Keywords: metal-organic frameworks; oxidation
- nerve gas agents [37][38][39][40][41][42]. Here, we describe the preparation of NU-400 [43], a zirconium-based MOF based on a judiciously chosen pyrene-based linker and utilized it as a photosensitizer for the efficient production of 1O2 and hence photocatalytic conversion of the sulfur mustard simulant
Charge-transfer interactions between fullerenes and a mesoporous tetrathiafulvalene-based metal–organic framework
Beilstein J. Nanotechnol. 2019, 10, 1883–1893, doi:10.3762/bjnano.10.183
- ], or to incorporate additional functionalities within the MOF [33][34][35]. Very recently, Farha and co-workers have demonstrated that encapsulation of C60 in a zirconium-based MOF can lead to an enhancement of electrical conductivity due to donor–acceptor interactions between the pyrene-based ligand
Materials nanoarchitectonics at two-dimensional liquid interfaces
Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153
- strategy for one-dimensional fullerene nanorods a promising approach for applications in photosensitive devices. Ji, Shrestha, and co-workers investigated the effects of the intercalation of polycyclic aromatic compounds, such as naphthalene, anthracene, and pyrene, on the formation of one-dimensional C60
- nanowhiskers in liquid–liquid interfacial precipitation processes [245]. The intercalation of polycyclic aromatic compounds generally modifies the growth of fullerene one-dimensional crystals depending on intercalation species. While anthracene and pyrene led to an increased porosity of the structures, the
Nanoconjugates of a calixresorcinarene derivative with methoxy poly(ethylene glycol) fragments for drug encapsulation
Beilstein J. Nanotechnol. 2018, 9, 2057–2070, doi:10.3762/bjnano.9.195
- participate in the formation of core–shell particles in aqueous solution. The critical association concentration (cac) value of 3 was obtained by using the fluorescent pyrene-probe method. It amounts to 0.01 mg/mL (Figure S8, Supporting Information File 1). mPEG-550 does not form self-organised structures
- probe). A temperature-dependent release of substrates from 3 + Dox micelles at physiological temperature is demonstrated in 0.9% NaCl solution. Experimental Materials Calixresorcinarene 1 was synthesized according to a previously reported procedure [36]. mPEG-550 was purchased from Aldrich, pyrene
- concentration (cac) of 3 in aqueous solution was determined by fluorescence spectra of pyrene (0.002 mM). The concentration of 3 and mPEG-550 was varied from 0.001 to 0.9 mg/mL. Pyrene was excited at 333 nm, emission spectra were recorded in the range of 338–500 nm, the excitation and emission slit widths were
Closed polymer containers based on phenylboronic esters of resorcinarenes
Beilstein J. Nanotechnol. 2018, 9, 1594–1601, doi:10.3762/bjnano.9.151
- resorcinarene (SRA) with phenylboronic acid. p(SRA-B) shows good stability in water and can be used as a nanocontainer for the pH- and glucose-controlled substrate release. Fluorescent dyes (fluorescein, pyrene and 1,3,6,8-pyrenetetrasulfonic acid tetrasodium salt) were successfully loaded into p(SRA-B). The
- ) was examined as a container for pH- and glucose-controlled storage and as a source of substrates. Three dyes were chosen: fluorescein (Fl), pyrene (Py) and 1,3,6,8-pyrenetetrasulfonic acid tetrasodium salt (PTS). These dyes differ in polarity but all of them are used as fluorescent probes to determine
- tendency to aggregate, precise quantification of pyrene is difficult. The analysis of the UV and fluorescent spectra of D@p(SRA-B) showed that all of the used dyes are encapsulated in the cavity of p(SRA-B) despite the difference in their polarity. For Fl@p(SRA-B), a bathochromic shift of the absorption
Review on nanoparticles and nanostructured materials: history, sources, toxicity and regulations
Beilstein J. Nanotechnol. 2018, 9, 1050–1074, doi:10.3762/bjnano.9.98
- air samples from the USA, a spider web sample in India and in ice core [95]. Also, benzo[a]pyrene, which is a polynuclear aromatic hydrocarbon and a carcinogen, is present in diesel exhaust, which makes it more toxic than gas engine exhaust [96]. Cardiopulmonary mortality [97][98], childhood cancers
Enzymatically promoted release of organic molecules linked to magnetic nanoparticles
Beilstein J. Nanotechnol. 2018, 9, 986–999, doi:10.3762/bjnano.9.92
- a high excess of PhSiH3 and THF as solvent were the best conditions. The optimized conditions were then applied to the real system, affording 6 in 55% yield over two steps. The moderate yield was mainly due to the high insolubility of all pyrene-containing compounds in most organic solvents, leading
- spectrum of pyrene. The fluorescence emission spectrum of pyrene, and therefore of 6, is characterized by an ensemble of four major bands with well-defined maxima at ≈375, 388, 398, and 415 nm, respectively. The peaks are attributed to the π → π* transitions and are cumulatively defined as monomeric
- characteristic of the tripeptide, the linker and pyrene, are also present in the conjugated NPs. In particular, signals related to carbonyl stretching, deriving from 6 and 12, can be observed at 1650 cm−1 in both conjugated samples, 9 and 13. Then we turned our attention to the enzymatic cleavage of the
Nanoscale isoindigo-carriers: self-assembly and tunable properties
Beilstein J. Nanotechnol. 2017, 8, 313–324, doi:10.3762/bjnano.8.34
- , respectively, two times and 20 times higher than that of the classical surfactants, CTAB and SDS. Fluorescence studies showed that significant changes occur in the pyrene spectrum of the isoindigo derivatives in solution for all the compounds under study, regardless the length of the alkyl chain (Figure 4b
- ). The change in pyrene fluorescence intensity is likely due to the decrease in the polarity of the pyrene microenvironment. Based on these spectra, the CAC of amphiphilic compounds was calculated from the I1/I3 values in the pyrene fluorescence spectrum as a function of the concentration of amphiphilic
- compounds [68][69]. Most probably, pyrene is incorporated into the hydrophobic region of the colloidal aggregates. Usually, the CMC values of surfactants determined by different methods are very similar [70]. But an additional binding of the fluorescent probe (pyrene) to the heterocyclic core of the
Rigid multipodal platforms for metal surfaces
Beilstein J. Nanotechnol. 2016, 7, 374–405, doi:10.3762/bjnano.7.34
A versatile strategy towards non-covalent functionalization of graphene by surface-confined supramolecular self-assembly of Janus tectons
Beilstein J. Nanotechnol. 2015, 6, 632–639, doi:10.3762/bjnano.6.64
- be noted that the most commonly used non-covalent approach for graphene functionalization involves binding of pyrene-substituted species by π–π interaction [30][31][32], however, without formation of a well-ordered adlayer. Well-organized adlayers have only recently been obtained by transferring HOPG
Tailoring the ligand shell for the control of cellular uptake and optical properties of nanocrystals
Beilstein J. Nanotechnol. 2015, 6, 232–242, doi:10.3762/bjnano.6.22
- the polymers were determined based on the varying fluorescence properties of pyrene, depending on the polarity of the surrounding medium [21]. The values correlate well with the polymer size and lie between 6.0 × 10−7 M for the smallest and 1.5 × 10−7 M for the biggest polymer. Encapsulation methods
Effect of channel length on the electrical response of carbon nanotube field-effect transistors to deoxyribonucleic acid hybridization
Beilstein J. Nanotechnol. 2014, 5, 2081–2091, doi:10.3762/bjnano.5.217
- Information File 1. The pyrene group of PASE non-covalently interacted with the CNT through π-stacking forces and the other loose end containing the succinimidyl ester group (or N-hydroxysuccinimide, NHS) covalently bound with the highly reactive amine group in the probe DNA. It was observed that the pyrene
Non-covalent and reversible functionalization of carbon nanotubes
Beilstein J. Nanotechnol. 2014, 5, 1675–1690, doi:10.3762/bjnano.5.178
- elected solvent. In particular both small molecules and high weight polymers have been used as dispersants. Aromatic molecules have a strong affinity for graphitic surfaces via π–stacking. The adsorption of different polycyclic aromatic hydrocarbons (PAH) such as pyrene, anthracene, tetracene and
- amount of pyrene in THF indicated that the adsorption process is reversible. Instead tetracene and pentacene were investigated by X-ray photoelectron spectroscopy [45]. The more than six times greater adsorption of tetracene with respect to that of phenanthrene was imputed to the nanoscale curvature of
- the cholesterol moiety of a multivalent cholesterol-containing polymer (CEM-EHA, see Table 1) an interaction very similar to that between pyrene and carbon nanotubes with cholesterol laying flat above the graphene surface. Supramolecular complexes of these copolymers with CNTs were soluble in THF
Nano-rings with a handle – Synthesis of substituted cycloparaphenylenes
Beilstein J. Nanotechnol. 2014, 5, 1320–1333, doi:10.3762/bjnano.5.145
- , which can be explained by the increase of ring strain. Furthermore, a synthesis of a pyrene-inserted CPP was developed by the Itami group (Scheme 5) [52]. This molecule represents a CPP that was benzannulated and π-extended at the bay-region by converting two biphenyl units into a pyrene unit. Pyrene
- derivatives show interesting photophysical properties like long fluorescence life time and excimer emission. Therefore, it was of interest to see if these features appear in the CPPs containing pyrene units. The preparation of cycloparaphenylene-2,7-pyridylene (CPPyr) is described in Scheme 5. The synthesis
- relies on the same strategy as that for the corresponding non-annelated CPP. It uses the L-shaped building block 16 and the pyrene unit is incorporated via Suzuki coupling of the diborylated 2,7-pyrene 22 to access the U-shaped unit 23. The two units were coupled using a nickel catalyst to give the
DNA origami deposition on native and passivated molybdenum disulfide substrates
Beilstein J. Nanotechnol. 2014, 5, 501–506, doi:10.3762/bjnano.5.58
- of studies, pyrene and 1-pyrenemethylamine, were evaluated as surface modifications which might mitigate this effect. While both species were found to form adsorption layers on MoS2 via physisorption, 1-pyrenemethylamine serves as a better protective agent and preserves the structures for
- significantly longer times. These findings will be beneficial for the fabrication of future DNA origami/MoS2 hybrid electronic structures. Keywords: atomic force microscopy (AFM); DNA origami; molybdenum disulfide (MoS2); pyrene; 1-pyrenemethylamine; surface modification; Introduction Since it was first
- reported below for the first time. An unanticipated observation was that DNA origami structures decompose on contacting the MoS2 surface. However, the shape of DNA origami constructs can be preserved with the aid of an adhesion layer composed of either pyrene or 1-pyrenemethylamine. It is expected that
Towards a scalable and accurate quantum approach for describing vibrations of molecule–metal interfaces
Beilstein J. Nanotechnol. 2011, 2, 427–447, doi:10.3762/bjnano.2.48
- efficient computational tool. We also present results on the vibrational spectrum of hydrogen fluoride on pyrene, on the thiophene molecule in the gas phase, and on small neutral gold clusters. Keywords: computational scaling; grid computing; molecule–metal interactions; periodic density functional theory
- to compute the anharmonic stretch frequency of hydrogen fluoride adsorbed on pyrene (Figure 6), a model system for the adsorption of HF on graphite. The potential energy surface (mode–mode representation) is computed at a moderate ab initio cost (MP2/SBK level of theory). This system is challenging
- as it contains 78 modes and the weak π–hydrogen bond requires correlated electronic structure methods. The computed harmonic frequency for the stretching mode of HF adsorbed on pyrene is 3661 cm−1 which is −112 cm−1 away from that of the free HF molecule, ω(HF) = 3773 cm−1 at this level of theory. At
Novel acridone-modified MCM-41 type silica: Synthesis, characterization and fluorescence tuning
Beilstein J. Nanotechnol. 2011, 2, 284–292, doi:10.3762/bjnano.2.33
- compound prepared from pyrenesulfonyl chloride and APTES via sulfamidation immediately yielded a flocculent precipitate when brought in contact with TEOS. This observation might be explained by the combination of the pyrene moieties, forming strong π-bonding interactions, and the highly polar hydrogen
- bonding sulfonamide, causing the compound to become inhomogeneous in TEOS. As expected, the material obtained from the pyrene precursor showed a drastically decreased inner surface area of only 322 m2·g−1 and no ordered material structure at all. The CHNS analysis of MCM-ACR clearly indicates a slightly
On the reticular construction concept of covalent organic frameworks
Beilstein J. Nanotechnol. 2010, 1, 60–70, doi:10.3762/bjnano.1.8
- -triyltriboronic acid (BTBA) and pyrene-2,7-diylboronic acid (PDBA) were considered as linkers a–e, respectively, with -B(OH)2 groups attached to each point of extension (Figure 5). Self-condensation of these building blocks result in the formation of B3O3 rings and the resultant COFs are those made of connector I
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