Koordinationschemische Synthesemethoden zum Aufbau supramolekularer Verbindungen

Holliday, Bradley J.; Mirkin, Chad A.

doi:10.1002/1521-3757(20010601)113:11<2076::aid-ange2076>3.0.co;2-s

Cited by 279 publications

(16 citation statements)

References 383 publications

(121 reference statements)

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“…1 H and 13 C NMR spectra were recorded on JEOL EX 400 and GX 400 spectrometers at 400 and 100.5 MHz, respectively. Solvent signals were used as internal standard: CDCl 3 ( 1 H, 7.24 ppm; 13 C, 77.0 ppm). IR spectra were recorded on a Bruker IFS25 spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Metal–Organic Coordination Networks of Ferric Wheels, their Surface-supported Supramolecular Architectures and STM/STS Imaging

Ako

Maid

Sperner

et al. 2005

Supramolecular Chemistry

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Six-membered ferric wheels [Fe 6 Cl 6 (L 2 ) 6 ] were generated from the corresponding N-alkylsubstituted 19 (3e)}, calcium hydride and iron(III) chloride. Compound 3d was characterized by X-ray crystal structure analysis. The lipophilic tails of 3d interdigitate to create strands that, by lateral van der Waals interactions, pack to form 2D layers. The stacking of these sheets creates the final 3D architecture of the crystal. An elementary structure formation process of complex molecule 3d on highly oriented pyrolytic graphite (HOPG) was studied. Using scanning tunneling microscopy (STM) under ambient conditions, we succeeded in combining high-resolution topography mapping with simultaneous current -voltage characteristics (scanning tunneling spectroscopy, STS) measurements on single molecules deposited on HOPG surfaces. One of the most interesting results is that the location of the individual metal ions in their organic matrix is directly addressable by STS.

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Section: Methodsmentioning

confidence: 99%

Metal–Organic Coordination Networks of Ferric Wheels, their Surface-supported Supramolecular Architectures and STM/STS Imaging

Ako

Maid

Sperner

et al. 2005

Supramolecular Chemistry

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“…They act as quantum dots, in which the cluster valence electrons are confined. [2] However, most metal carbonyl clusters displaying redox behavior have fortuitously been obtained. [3] lene) stainless-steel pressure vessel (fill factor 75 %).…”

Section: Methodsmentioning

confidence: 99%

(C2H10N2)[Cr(HPO3)F3]: The First Organically Templated Fluorochromium(III) Phosphite

Fernández

Mesa

Pizarro

et al. 2002

Angew. Chem. Int. Ed.

120

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In recent years the search for new open-framework materials with transition metal elements has become the focus of much interest due to the potential application of these materials as absorbents, ion exchangers, solid-state electrolytes, and catalysts in heterogeneous catalysis. [1] Such applications are not possible with main group systems of tetrahedral framework zeolites. The syntheses of these materials usually involve organic templates, for example organic diamines, for generating large cavities and are performed under mild hydrothermal conditions to avoid the formation of dense phases.Microporous behavior has been successfully extended to the phosphate and arsenate systems of at least 14 elements of the periodic table, but examples dealing with chromium have not been reported. [1b, 2] The pattern of behavior of these kinds of compounds is underpinned by the strength of the PÀO COMMUNICATIONS 3683 lengths are expected to be 56 and 27 nm for PAC-1 and PAC-2, respectively, which correspond approximately to the actual average PAC lengths adsorbed in the presence of alkanes. Therefore, we suggest that the length distribution of PACs in solution is preserved upon co-adsorption of PAC and alkanes. Apparently, PACs and alkanes co-assemble at the interface without interfacial reorganization.In summary, almost perfectly straight and epitaxially oriented chains of metallosupramolecular coordination-polyelectrolyte±amphiphile complexes formed from rigid ditopic metal ion receptors are self-assembled on the basal plane of graphite by using long chain alkanes as an orienting template layer. Through a sequence of molecular recognition steps comprising metal ion coordination, electrostatic interactions, and amphiphilic self-assembly the adsorption of nanoscopic assemblies can be performed at an interface in a predictable manner. Controlling the correlation of position and orientation is of paramount importance for encoding new properties and functions. [15] On-going research in our laboratories indicates that this approach is of general utility. The modularity of this approach provides an entry to encode the valueadding physicochemical properties of metallosupramolecular devices into nanoscopic architectures that can be addressed and manipulated individually by scanning probe techniques. Experimental SectionLigands 1, 2, and 3 were prepared according to literature procedures. [16] The assembly of MEPE and PAC was carried out according to previously published procedures. [8] Alkanes (C 32 H 66 , C 44 H 90 , C 50 H 102 , Aldrich) were used as received. Solutions of neat PACs (1.3 î 10 À3 g L À1 ) or mixtures of PAC (1.3 î 10 À3 g L À1 ) with C 32 H 66 , C 44 H 90 , C 50 H 102 (1.3 î 10 À2 g L À1 ) were spin-coated onto the basal plane of highly oriented pyrolytic graphite (HOPG, Advanced Ceramics Co., USA, quality ZYH at 40 rps). The coated graphite samples were dried for 10 min at 40 8C before SFM investigations were carried out with a Nanoscope IIIa (Digital Instruments, Santa Barbara, CA) in the tapping mode. An E-scann...

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“…[2][3][4][5][6][7][8] This strategy was recently applied to low dimensions by assembling regular molecular architectures from organic molecules and transition-metal centers directly on solid surfaces. [9, 10] A variety of surface-supported molecular network structures has been made accessible by the general application of a surface-assisted metal-coordination method to metal centers and aromatic polycarboxylic acids on metal surfaces.…”

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confidence: 99%

Surface‐Assisted Assembly of 2D Metal–Organic Networks That Exhibit Unusual Threefold Coordination Symmetry

et al. 2007

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Coordination-based supramolecular chemistry, [1] with its characteristic control of the self-assembly process and intrinsic defect tolerance, has been proven to be a very efficient synthetic tool to fabricate metallosupramolecular networks of well-defined topology in one, two, and three dimensions. [2][3][4][5][6][7][8] This strategy was recently applied to low dimensions by assembling regular molecular architectures from organic molecules and transition-metal centers directly on solid surfaces. [9, 10] A variety of surface-supported molecular network structures has been made accessible by the general application of a surface-assisted metal-coordination method to metal centers and aromatic polycarboxylic acids on metal surfaces. [9] As valid for supramolecular structures in general, the structures of the two-dimensional metal-organic coordination networks (2D-MOCNs) formed are predetermined by the properties of the ligands (e.g., donor atoms and their spatial arrangement, steric crowding) and the electronic characteristics of the metal ions (e.g., involved orbitals, ionization energies). However, under 2D conditions, the realization of a given coordination algorithm might be altered by the presence of a metal substrate, which results in deviating coordination geometries for the same metal-ligand coupling in comparison to the 3D situation (e.g., in the bulk phase). Such deviation can be attributed to charge transfer or screening effects and the strict 2D confinement of ligands and metal centers imposed by the substrate, which substantially influences the characteristics of the metal-to-ligand bonding within the 2D coordination network. [10e]

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Koordinationschemische Synthesemethoden zum Aufbau supramolekularer Verbindungen

Cited by 279 publications

References 383 publications

Metal–Organic Coordination Networks of Ferric Wheels, their Surface-supported Supramolecular Architectures and STM/STS Imaging

Metal–Organic Coordination Networks of Ferric Wheels, their Surface-supported Supramolecular Architectures and STM/STS Imaging

(C2H10N2)[Cr(HPO3)F3]: The First Organically Templated Fluorochromium(III) Phosphite

Surface‐Assisted Assembly of 2D Metal–Organic Networks That Exhibit Unusual Threefold Coordination Symmetry

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