Controlled Arrangement of Supramolecular Metal Coordination Arrays on Surfaces

Semenov, A. N.; Spatz, Joachim P.; Möller, Martin; Lehn, Jean‐Maríe; Sell, Bernd; Schubert, Dieter; Weidl, Christian H.; Schubert, Ulrich S.

doi:10.1002/(sici)1521-3773(19990903)38:17<2547::aid-anie2547>3.0.co;2-m

Cited by 191 publications

(88 citation statements)

References 3 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This requires an accurate control of the molecular arrangements over a wide range of length scales, from micrometers down to the molecular level. Covalent, but more often non covalent intermolecular forces have been used to engineer highly ordered three dimensional supramolecular architectures where the single building blocks are held together by specific interactions, such as metal ligand bonding, [85]- [87] hydrogen bonding [88]- [91] and stacking. [92] On the other hand, self assembly at the solid liquid interface has been successfully used to control the molecular arrangement in two dimensions.…”

Section: Immobilization Of Organic Moleculesmentioning

confidence: 99%

Shape‐Switchable Azo‐Macrocycles

et al. 2009

View full text Add to dashboard Cite

The synthesis of four shape‐switchable macrocycles comprising different peripheral substituents is described. The macrocycles 1–4 consist of m‐terphenyl semicircles interlinked by two azo joints. These macrocycles were assembled from nitro‐functionalized m‐terphenyl moieties through reductive dimerization. The semicircles were assembled through Suzuki cross‐coupling reactions. The molecular weights of the macrocycles were determined by vapour pressure osmometry, because mass spectrometry failed in the cases of 2 and 3. The E → Z photoisomerization reactions were analysed by UV/Vis spectroscopy complemented by 1H NMR studies. A very slow thermal back‐reaction indicated considerable stabilization of the Z isomer. The reduced efficiency of the thermal back‐reaction probably arises from the reduced degree of freedom due to the mechanical interlinking of the two azo groups. The photostationary state consisted of all‐Z (85 %) and all‐E isomers (15 %). The E → Z transformation induced by irradiation displayed simple exponential kinetics, which indicates pairwise switching of the two azo groups in a macrocycle, at least on the timescale under investigation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

show abstract

Section: Immobilization Of Organic Moleculesmentioning

confidence: 99%

Shape‐Switchable Azo‐Macrocycles

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The co-deposition of transition-metal ions and organic ligands on crystalline surfaces offers the potential to design supramolecular grids with programmable structural and chemical features 19,20 , where the interaction with the substrate is used to stabilize a planar geometry 21,22 . Fe x (TPA) y complexes on Cu(100) constitute a prototypical 2D hetero-assembled system forming a variety of mono-and bi-nuclear network structures, in which the morphology is determined by the Fe:TPA stoichiometry, substrate symmetry and annealing temperature [22][23][24] .…”

mentioning

confidence: 99%

Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface

et al. 2009

View full text Add to dashboard Cite

. The control of magnetic anisotropy is a key issue in the development of molecule-metal interfaces for magnetic applications, both at the single-molecule 12 and extended-film level 13 . In metallic multilayers used as storage media or spin-valve devices at present, tuning of the magnetic anisotropy is achieved either by a careful choice of the overlayer/substrate composition and thickness or by oxidation of the magnetic elements 11,14,15 . Recent studies showed that the magnetization direction of surface-supported paramagnetic molecules can be controlled through exchange coupling with a magnetic film, which provides robust ferromagnetic properties but does not enable each molecule to be switched independently from the substrate or its neighbours 16,17 . Alternatively, theoretical work suggested that the sign of magnetic anisotropy could be reversed in metal-organic complexes by exploiting oxidation processes that affect the hybridization of molecular orbitals with metal states carrying non-zero orbital magnetization 18 . Here, we investigate supramolecular self-assembly on a non-magnetic Cu surface as a means to produce two-dimensional

show abstract

“…These processes will play a critical role in the so-called ''bottom-up'' strategy of nanofabrication. Therefore, understanding the organization of molecules on solid surfaces is important, both from a fundamental and applied perspective, for the construction of surface molecular nanostructures and nanodevices (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). A self-organized molecular pattern with control of structure and derived concomitant function could provide promising materials for the construction of nanodevices that cannot be prepared by conventional microfabrication.…”

mentioning

confidence: 99%

Mesoscopic self-organization of a self-assembled supramolecular rectangle on highly oriented pyrolytic graphite and Au(111) surfaces

Gong

Wan

Yuan

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

A self-assembled supramolecular metallacyclic rectangle was investigated with scanning tunneling microscopy on highly oriented pyrolytic graphite and Au(111) surfaces. The rectangles spontaneously adsorb on both surfaces and self-organize into well ordered adlayers. On highly oriented pyrolytic graphite, the long edge of the rectangle stands on the surface, forming a 2D molecular network. In contrast, the face of the rectangle lays flat on the Au(111) surface, forming linear chains. The structures and intramolecular features obtained through high-resolution scanning tunneling microscopy imaging are discussed.metallacyclic macrocycle ͉ scanning tunneling microscopy ͉ molecular adlayer ͉ molecular orientation S elf-organization (1) and self-assembly (2) are critical and necessary processes in all living organisms and are of ever increasing importance in chemistry and material science. These processes will play a critical role in the so-called ''bottom-up'' strategy of nanofabrication. Therefore, understanding the organization of molecules on solid surfaces is important, both from a fundamental and applied perspective, for the construction of surface molecular nanostructures and nanodevices (3-13). A self-organized molecular pattern with control of structure and derived concomitant function could provide promising materials for the construction of nanodevices that cannot be prepared by conventional microfabrication. The arrangement of adsorbed molecules onto a surface depends on both intermolecular and molecule-surface interactions. For example, Hipps and colleagues (3, 4) prepared a self-organized 2D bifunctional structure on a Au (111) Metal-containing macrocycles with high symmetry and precise architecture are a new class of promising supramolecules for future application in nanotechnology because of their exact shape and size, as well as magnetic, photophysical, and electrostatic properties (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27). In this article, we describe scanning tunneling microscopy (STM) studies of the self-assembled supramolecular metallacyclic rectangle, cyclobis [(1, ) 2 )anthracene)(1,4Ј-bis(4-ethynylpyridyl)benzene](PF 6 ) 4 , (Fig. 1) (28). The dimensions of a single rectangle molecule were independently determined to be 3.1 nm long by 1.2 nm wide, from the previously reported x-ray crystallographic data (28). The molecular adlayers were prepared on highly oriented pyrolytic graphite (HOPG) and Au(111) surfaces to investigate the effect of substrate on adlayer formation. The molecules self-organize into well ordered 2D adlayers on both surfaces, and high-resolution STM results clearly reveal an intact rectangle on both HOPG and Au (111) surfaces, but the symmetry and molecular orientation the molecules adopt depends on the substrate. Materials and MethodsChemicals. The PF 6 Ϫ salt of the rectangle was prepared analogously to the ClO 4 Ϫ salt previously reported (28), substituting KPF 6 for NaClO 4 .Substrates. HOPG (quality ZYB) was purchased from Digital Instruments (Santa Barbar...

show abstract

Controlled Arrangement of Supramolecular Metal Coordination Arrays on Surfaces

Cited by 191 publications

References 3 publications

Shape‐Switchable Azo‐Macrocycles

Shape‐Switchable Azo‐Macrocycles

Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface

Mesoscopic self-organization of a self-assembled supramolecular rectangle on highly oriented pyrolytic graphite and Au(111) surfaces

Contact Info

Product

Resources

About