ChemPhysChem

Cover image for Vol. 3 Issue 12

December 16, 2002

Volume 3, Issue 12

Pages 985–1070

    1. Cover Picture: ChemPhysChem 12/2002 (page 985)

      Fabian Köhn, Johan Hofkens, Roel Gronheid, Mircea Cotlet, Klaus Müllen, Mark Van der Auweraer and Frans C. De Schryver

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290013

    2. Computer Simulations and Neutron Reflectivity of Proteins at Interfaces (pages 993–999)

      Amol A. Mungikar and Daniel Forciniti

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290015

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      What makes a peptide stick? The adsorption of short peptides, such as the poly(lysine) shown (water molecules removed for clarity), is now experimentally and computationally accessible. Neutron reflectivity and Monte Carlo or MD simulations can be used to understand the molecular events, for example rearrangements of hydrating water molecules, that occur as a protein adsorbs at a solid–liquid interface. These processes are of critical importance in implants, biosensors, and bioseparation units.

    3. What Does Elementary Chirality Have to Do with Neutrinos? (pages 1001–1003)

      Martin Avalos, Reyes Babiano, Pedro Cintas, José L. Jiménez and Juan C. Palacios

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290000

      Asymmetry at the level of elementary particles is both a wonder and a challenge. Current measurements of violation with respect to simultaneous space reflection and charge conjugation (CP violation) in the decay of B mesons appear to account for the excess of matter over antimatter. However, this particular decay can only be observed after a huge number of B decays. Alternative explanations of the surplus of matter, and perhaps the phenomenon of asymmetry itself, might arise from the violation of other fundamental conservation laws, which have not been considered in the Standard Model of high-energy physics and the rules by which it is constructed. Neutrinos, elusive particles which are difficult to detect, may give a valuable hint toward something new in the Standard Model.

    4. Excitation Energy Transfer in Dendritic Host–Guest Donor–Acceptor Systems (pages 1005–1013)

      Fabian Köhn, Johan Hofkens, Roel Gronheid, Mircea Cotlet, Klaus Müllen, Mark Van der Auweraer and Frans C. De Schryver

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290001

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      A little give and take: Single-molecule measurements of the Förster energy transfer between two different guest chromophores in a dendritic host provide detailed information on both static (distribution of hosts over guest) and dynamic properties of the system. For a single entity, low donor emission corresponds to fast fluorescence decay of the donor and high emission to slow decay (see picture), which demonstrates that changes in energy transfer efficiency occur within a single entity.

    5. Singlet Energy Transfer as the Main Pathway in the Sensitization of Near-Infrared Nd3+ Luminescence by Dansyl and Lissamine Dyes (pages 1014–1018)

      Gerald A. Hebbink, Stephen I. Klink, Lennart Grave, Patrick G. B. Oude Alink and Frank C. J. M. van Veggel

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290002

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      Unexpected energy transfer: Sensitization of Nd3+ luminescence in antenna-functionalized lanthanide(III) complexes takes place exclusively via the antenna singlet state, when dansyl or lissamine are the sensitizers (see structure; Bz=benzoyl; Ds=dansyl; Ln=lanthanide; Ls=lissamine). The Nd3+ ion has appropriate energy levels that obey the energy transfer selection rules for a fast transfer of excitation energy from the singlet excited states of the dyes.

    6. Surface Electromigration Patterns in a Confined Adsorbed Metal Film: Ga on GaN (pages 1019–1023)

      Alexei Barinov, Luca Gregoratti, Burkhard Kaulich and Maya Kiskinova

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290003

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      Migrants under the microscope. Scanning photoemission microscopy revealed the factors that determine Ga concentration patterns as a result of surface electromigration of a confined Ga film on a GaN surface (as shown in the graphic). These factors are the different mobility of Ga atoms in the first and top layer, temperature, and the microstructure (vacancies and trapping centers) of the Ga film. The experimental results are confirmed by numerical simulations of general validity.

    7. Cubic Mesophase in an Unsymmetrical Alkyl Ammonium Salt. Synthesis and Structural Model (pages 1024–1030)

      Corinne Soulié, Pierre Bassoul and François Tournilhac

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290004

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      Four strong, winds. Quaternary ammonium cations with four different alkyl chains have been selectively synthesized. The N,N,N-butylethylpentylpropylammonium iodide exhibits a disordered crystalline phase of cubic symmetry (Pm̄equation imagen space group). As shown in graphic, iodine and tetraalkylammonium ions occupy highly symmetrical positions which may be generated by stepwise rotation of the ammonium cation.

    8. AFM, X-ray Diffraction and Optical Microscopy Studies of Faceted Droplets of a Thermotropic Bicontinuous Cubic Mesophase (pages 1031–1034)

      Catherine Even, Agnès Gourbil, Marianne Impéror-Clerc, Pawel Pieranski and Michèle Veber

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290005

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      Facing the facts: Droplets of a new thermotropic cubic mesophase are observed at room temperature both by optical microscopy and atomic force microscopy. With AFM, we prove that steps on the facets are involved in the facetting mechanism of these droplets. The AFM image shows the detail of a facet's corner and a rough area in between.

    9. Quantum Transport Effects in Nanosized Graphite Sheets (pages 1035–1037)

      Tomofumi Tada and Kazunari Yoshizawa

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290006

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      Towards small switches: The relationship between molecular orbitals and the conductance of a molecular wire, composed of a nanosized graphite sheet and two gold chains, is described. Useful rules for effective quantum transport are given, and a new model for a molecular switch is proposed. As indicated in the cartoon, the zigzag edges help populate the HOMO and LUMO and thereby play an important role in conductivity.

    10. Solid-State Fingerprints of Molecular Threading Detected by Inelastic Neutron Scattering (pages 1038–1041)

      Giovanni Bottari, Roberto Caciuffo, Marianna Fanti, David A. Leigh, Stewart F. Parker and Francesco Zerbetto

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290007

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      Through the eye of the needle. For the first time, solid-state fingerprints caused by molecular threading (see picture) are identified using a vibrational spectroscopy. Comparison between experimental and theoretical data, inelastic neutron scattering and molecular mechanics, respectively, allowed identification of a band diagnostic of threading.

    11. Two-Dimensional Self-Assembly of Liquid-Crystalline Perylene Diimide Derivatives at the Air/Water Interface (pages 1041–1044)

      Guodong Sui, Jhony Orbulescu, Mustapha Mabrouki, Roger M. Leblanc, Shenggao Liu and Brian A. Gregg

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290008

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      Sideways arrangement: The self-assembly of PPEEB liquid crystalline molecules at the air/water interface was investigated as a function of surface pressure. The self-assembly is caused by a compact edge-on molecular orientation, which gives rise to a range of different-sized aggregate microstructures.

    12. A Comparative Investigation of Spin Crossover in Bulk Materials, Lamellar CdPS3 Layers, and Polyelectrolytes in a Series of Ferric Complexes: [FeIII((X-sal)2trien)]Y (pages 1045–1049)

      Archana Jaiswal, Sébastien Floquet, Marie-Laure Boillot and Pierre Delhaès

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290009

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      Magnets: more shapes than just bars and horseshoes. Ferric complexes of the hexadentate ligand shown exhibit gradual spin crossover processes. The host matrices affect its magnetic properties when intercalated in a lamellar material or encapsulated in different polyelectrolytes. A general relationship between line width and spin conversion is established; compounds based on polyelectrolytes suffer a partially blocked spin equilibrium.

    13. Preview: ChemPhysChem 12/2002 (page 1054)

      Version of Record online: 9 DEC 2002 | DOI: 10.1002/cphc.200290012

    14. AUTHOR INDEX: ChemPhysChem 12/2002 (pages 1057–1059)

      Version of Record online: 12 MAY 2003 | DOI: 10.1002/1439-7641(20021216)3:12<1057::AID-CPHC1057>3.0.CO;2-X

    15. BOOK REVIEWS: ChemPhysChem 12/2002 (page 1060)

      Version of Record online: 12 MAY 2003 | DOI: 10.1002/1439-7641(20021216)3:12<1060::AID-CPHC1060>3.0.CO;2-#

    16. SUBJECT INDEX: ChemPhysChem 12/2002 (pages 1061–1070)

      Version of Record online: 12 MAY 2003 | DOI: 10.1002/1439-7641(20021216)3:12<1061::AID-CPHC1061>3.0.CO;2-U

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