15 documents found

Article / Chapter
CC BY 3.0
2017

High-Frequency Mechanostimulation of Cell Adhesion

Weinheim: Wiley-VCH (Deutschland), 2017
Article / Chapter
2012

Tetrakis(diisopropyl amide) substituted norbornadiene and quadricyclane...

Tetrakis(diisopropyl amide) substituted norbornadiene and quadricyclane derivatives were investigated for their extraction and transport capabilities with alkaline earth metal cations. Both amides exhibited a remarkably high preference of Ba2+ over any other alkali metal or alkaline earth cation. The...
London: Royal Society of Chemistry, 2012
Article / Chapter
2012

Coarctate cyclization reactions: a primer

The cleavage of five-membered heterocycles possessing an exocyclic carbene or nitrene to form conjugated ene–ene–yne systems has been documented for over 40 years; however, the reverse reaction, using a conjugated “ene–ene–yne” precursor to form a heterocycle is a relatively new approach. Over the past...
London: Royal Society of Chemistry, 2012
Article / Chapter
2012

Introducing a photo-switchable azo-functionality inside Cr-MIL-101-NH2...

For the first time an azo functionality was covalently introduced into a MOF by post-synthetic modi fi cation. The reaction of Cr-MIL-101-NH 2 with p-phenylazobenzoylchloride (1) and 4-(phenylazo)- phenylisocyanate (2) as the reactants led to the compounds Cr-MIL-101_amide and Cr-MIL-101_urea, with...
London: Royal Society of Chemistry, 2012
Article / Chapter
2011

Adlayers based on molecular platforms of trioxatriangulenium

The platform approach for preparation of molecular adlayers with freestanding functional groups was extended to systems on the basis of the trioxatriangulenium ion. Self-assembled monolayers of these compounds were prepared on Au(111) surfaces and characterized by scanning tunneling microscopy, revealing...
London: Royal Society of Chemistry, 2011
Article / Chapter
2011

The first porous MOF with photoswitchable linker molecules

We synthesized a porous twofold interpenetrated MOF [Zn 2 (NDC) 2 (1)] (coined CAU-5) using 3-azo-phenyl-4,4¢-bipyridine (1), 2,6-naphthalenedicarboxylic acid, and Zn(NO 3 ) 2 · 6H 2 O. The azo-functionality protrudes into the pores, and can be switched, by irradiation with UV light (365 nm), from the...
London / Cambridge: Royal Society of Chemistry, 2011
Article / Chapter
2010

Photoswitching of azobenzene multilayers on a layered semiconductor

In situ photoelectron spectroscopy is used to study the adsorption and photoisomerization of azobenzene multilayers on the layered semiconductor HfS 2 at liquid nitrogen temperatures. The measured valence band spectra indicate weak molecule–substrate coupling and provide evidence for reversible switching...
College Park (Maryland): American Institute of Physics, 2010
Article / Chapter
2010

Self-assembly of triazatriangulenium-based functional adlayers on Au(111)...

Detailed scanning tunneling microscopy studies of the attachment of freestanding molecular functions to Au(111) surfaces via self-assembly of functional molecules based on triazatriangulenium platforms are presented. As shown for molecules with side chains of different length and phenyl, azobenzyl,...
London: Royal Society of Chemistry, 2010
Article / Chapter
2010

Single azopyridine-substituted porphyrin molecules for configurational...

A new azopyridine functionalized Ni–porphyrin was synthesized as a model compound for deposition and switch on surfaces. Two geometrically and electronically different states of single molecules on Au(111) were found by scanning tunneling microscopy/ spectroscopy and analyzed with density functional...
London: Royal Society of Chemistry, 2010
Article / Chapter
2009

Brownian molecular rotors: Theoretical design principles and predicted...

We propose simple design concepts for molecular rotors driven by Brownian motion and external photochemical switching. Unidirectionality and efficiency of the motion is measured by explicit simulations. Two different molecular scaffolds are shown to yield viable molecular rotors when decorated with suitable...
College Park / Maryland: American Institute of Physics, 2009
Article / Chapter
2009

Substituent effects on 61Ni NMR chemical shifts

61 Ni chemical shifts of Ni(all-trans-cdt)L (cdt = cyclododecatriene, L = none, CO, PMe3), Ni(CO)4, Ni(C2H4)2(PMe3), Ni(cod)2 (cod = cyclooctadiene) and Ni(PX3)4 (X = Me, F, Cl) are computed at the GIAO (gauge-including atomic orbitals), BPW91, B3LYP and BHandHLYP levels, using BP86-optimised geometries...
London: Roayal Society of Chemistry, 2009
Article / Chapter
2005

Femtosecond fluorescence up-conversion spectroscopy of a rotation-restricted...

Femtosecond time-resolved fluorescence up-conversion spectroscopy has been used in a study of the photo- induced isomerization reactions of a rotation-restricted trans-azobenzene (trans-AB) derivative capped by a crown ether (1), a chemically similar open derivative (2), and unsubstituted trans-AB (3)...
London: Royal Society of Chemistry, 2005
Article / Chapter
1999

Long-lived [1.1.1.1]- and [2.2.1.1]-‘Isopagodane’ dications: novel 4C/2e...

The dications generated from [1.1.1.1] and [2.2.1.1]iso- pagodane in SbF 5 –SO 2 ClF solution at 278 °C are of s-bishomoaromatic nature (4C/2e), very similar in geometry, yet chemically different in their properties.
London: Royal Society of Chemistry, 1999
Article / Chapter
1998

Straightforward syntheses of biradical-producing bicyclic dienediynes—dienediyne...

The dienediyne models 23 and 28 of the pharmacophore of the antitumor natural product neocarzinostatin were prepared. Each synthesis requires only six steps from a-formylcyclohexanone. Our approach uses two key steps. The Ðrst consists of one-pot biscoupling reactions between propargyl alcohol, 2,2-dimethyl-3-butyn-1-ol...
London: Royal Society of Chemistry, 1998