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Search for "monolayer" in Full Text gives 61 result(s) in Beilstein Journal of Organic Chemistry.

Control over molecular motion using the cistrans photoisomerization of the azo group

  • Estíbaliz Merino and
  • María Ribagorda

Beilstein J. Org. Chem. 2012, 8, 1071–1090, doi:10.3762/bjoc.8.119

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  • results in a collective structural change in a certain direction. This cooperative molecular motion of SAMazo acts as a molecular lift capable of lifting one Hg drop deposited on the monolayer of azobenzenes. Furthermore, this device acts as a photoswitch of the current between the Au(111) layer and the
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Published 12 Jul 2012

Multistep organic synthesis of modular photosystems

  • Naomi Sakai and
  • Stefan Matile

Beilstein J. Org. Chem. 2012, 8, 897–904, doi:10.3762/bjoc.8.102

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  • surface of monolayer 48 were removed with DTT to afford free thiols on the surface of monolayer 49. For SOSIP [18][19], the concentration of propagators had to be optimized to a critical SOSIP concentration, cSOSIP. Below cSOSIP, ring-opening disulfide-exchange polymerization [27] does not occur, whereas
  • propagator, the temperature, the presence of oxygen in the solution and, most importantly, the composition of the solvent mixture used. For propagator 3, cSOSIP = 3.5 mM was found in a 1:1 mixture of chloroform and methanol with 100 mM DIPEA as a base catalyst. Incubation of monolayer 49 in this solution
  • structures (Scheme 4 and Scheme 5). We thus summarize both processes in schematic form (Scheme 6). To recapitulate briefly from this perspective, we repeat that the solid-phase synthesis begins with the deposition of initiator 2 on ITO. Activation of monolayer 48 with DTT produces monolayer 49 with free
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Published 19 Jun 2012

An easily accessible sulfated saccharide mimetic inhibits in vitro human tumor cell adhesion and angiogenesis of vascular endothelial cells

  • Grazia Marano,
  • Claas Gronewold,
  • Martin Frank,
  • Anette Merling,
  • Christian Kliem,
  • Sandra Sauer,
  • Manfred Wiessler,
  • Eva Frei and
  • Reinhard Schwartz-Albiez

Beilstein J. Org. Chem. 2012, 8, 787–803, doi:10.3762/bjoc.8.89

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  • migration assay, we observed the effect of GSF on migration of the human melanoma lines WM-115 and WM-266-4 into a wound scratched into an intact cell monolayer. The migration rates of the two untreated cell lines are clearly different. While WM-115 cells from the original tumor needed about 24 h for the
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Published 29 May 2012

Liquid-crystalline heterodimesogens and ABA-heterotrimesogens comprising a bent 3,5-diphenyl-1,2,4-oxadiazole central unit

  • Govindaswamy Shanker,
  • Marko Prehm and
  • Carsten Tschierske

Beilstein J. Org. Chem. 2012, 8, 472–485, doi:10.3762/bjoc.8.54

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  • comparable to the molecular length Lmol = 4.5–4.6 nm in the most stretched conformation (determined with CPK models). This indicates a kind of monolayer organization of the molecules in the cybotactic clusters. In the SmA-like clusters the alkyl chains are segregated from the aromatic cores, and the
  • ). Considering the tilt, a calculated d-value of dcal = 4.8 nm would be expected according to dcal = Lmol cos β for the molecule in the most stretched conformation and a reduction to the experimental value of d = 4.4 nm is easily possible by conformational disorder. Hence, it is in line with a monolayer
  • with the C5 spacers are organized side-by-side and separated from the alkyl chains in the monolayer smectic phases and in the cybotactic clusters of the nematic phase (Figure 4a), in the case of compound Thia-Ox/10 the longer C10 spacers cannot be accommodated between the aromatic cores. These long
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Published 30 Mar 2012

Liquid-crystalline nanoparticles: Hybrid design and mesophase structures

  • Gareth L. Nealon,
  • Romain Greget,
  • Cristina Dominguez,
  • Zsuzsanna T. Nagy,
  • Daniel Guillon,
  • Jean-Louis Gallani and
  • Bertrand Donnio

Beilstein J. Org. Chem. 2012, 8, 349–370, doi:10.3762/bjoc.8.39

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  • hexagonal lattices has been observed for simple monolayer-protected NPs on surfaces [52]. Whilst theoretical treatments predict that Au NPs coated with simple linear thiols should exhibit spontaneous asymmetry at low temperatures or in solution [53][54][55], simple NP-hybrids of this type are yet to exhibit
  • ), respectively, in a two-step process to give a 1:1 mixed monolayer coverage [76]. Bent-core ligand 1410,10 displayed a monotropic LC phase whilst 1412,11 was not mesomorphic. Unfortunately, the hybrids did not display any LC phases, though they could be dispersed into some selected bent-core LC hosts, which
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Published 08 Mar 2012

Fifty years of oxacalix[3]arenes: A review

  • Kevin Cottet,
  • Paula M. Marcos and
  • Peter J. Cragg

Beilstein J. Org. Chem. 2012, 8, 201–226, doi:10.3762/bjoc.8.22

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  • cationic complex was deposited as a monolayer onto an alkylsulfonate coated gold surface and elicited both a redox response, as determined by cyclic voltammetry, and a photochemical response to visible light [83][84]. The optical response was studied further [85], and a transient band was observed at 545
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Published 07 Feb 2012

Syntheses and properties of thienyl-substituted dithienophenazines

  • Annemarie Meyer,
  • Eva Sigmund,
  • Friedhelm Luppertz,
  • Gregor Schnakenburg,
  • Immanuel Gadaczek,
  • Thomas Bredow,
  • Stefan-S. Jester and
  • Sigurd Höger

Beilstein J. Org. Chem. 2010, 6, 1180–1187, doi:10.3762/bjoc.6.135

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  • -condensed thiophene analogues. These assignments of the thiophene moieties as donors and the phenazine moieties as acceptors are confirmed by quantum-chemical calculations at the density-functional level. Additionally, one of the compounds forms a self-assembled monolayer on a HOPG surface, as imaged by
  • of a self-assembled monolayer, most probably due to sterical hindrance of the molecules to cover the surface densely. Conclusion We have developed a simple method for preparing phenazine-thiophene oligomers. These compounds show interesting optical characteristics, which can be tuned by attachment of
  • transition to this state. Self-assembled monolayer of 12b on HOPG. a) STM image (VS = −0.8 V, It = 80 pA, image size 25.0 × 25.0 nm2); b) structure model [39]. Synthesis of 4. a) 1) EtLi, Et2O, −78 °C, 1 h; 2) (COOMe)2, Et2O, −78 °C, 2 h, 33%; b) FeCl3, MeNO2, CH2Cl2, rt, 16 h, 71%; c) Br2, AcOH, CHCl3
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Published 13 Dec 2010

Synthesis, electronic properties and self-assembly on Au{111} of thiolated (oligo)phenothiazines

  • Adam W. Franz,
  • Svetlana Stoycheva,
  • Michael Himmelhaus and
  • Thomas J. J. Müller

Beilstein J. Org. Chem. 2010, 6, No. 72, doi:10.3762/bjoc.6.72

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  • presence of a gold-coated silicon wafer. Monolayer formation is confirmed by ellipsometry and the results compared to those obtained by force field and DFT calculations. Keywords: cyclic voltammetry; ellipsometry; phenothiazines; SAM; thiols; Introduction Functional organic π-systems [1] are of great
  • influenced by the adjacent phenyl system. Table 2 shows dth for the different molecules along with the experimental thickness dexp as determined by ellipsometry. The theoretical thicknesses are given for MM2 as well as DFT calculations. As a simple measure of monolayer formation of the different systems, the
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Published 02 Jul 2010

Molecular recognition of organic ammonium ions in solution using synthetic receptors

  • Andreas Späth and
  • Burkhard König

Beilstein J. Org. Chem. 2010, 6, No. 32, doi:10.3762/bjoc.6.32

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Published 06 Apr 2010
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  • further significance to studies of surface-based crystallizations of monolayer and multilayer hydrogen-bonded networks and metal–organic frameworks on various substrates [26][27], in the context of the design of novel molecular devices. Experimental The ZnTPyP, 1,4,5,8-naphthalenetetracarboxylic acid
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Published 11 Dec 2009
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  • to stronger intermolecular interactions between the hydrophobic chains of neighboring molecules, and therefore to increasing stability of the monolayer of 4-fluoroceramide at the air water interface. Introduction Sphingolipids belong to the most important constituents of the membranes of eukaryotic
  • -fluorinated parent compounds, and therefore to higher stability of the monolayer formed at the air/water interface. This unique behavior of the 4-fluoroceramide molecules provides the basis for further development of the morphology of the monolayer and possible formation of multi-layers, as well as for
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Published 25 Apr 2008
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