Molecular recognition of isomeric protonated amino acid esters monitored by ESI-mass spectrometry

• Andrea Liesenfeld and
• Arne Lützen

Beilstein J. Org. Chem. 2014, 10, 825–831, doi:10.3762/bjoc.10.78

• trace amounts of material, and can be used to explore competitive experiments that are difficult to perform using UV–vis or NMR spectroscopy. Results and Discussion Design and synthesis of the concave templates Ammonium ions exhibit strong binding affinity towards crown ether moieties. Hence, we decided

• -position of the amino acid derivative at the same time. Hence, we think it is not fallacious that 1 and 2 might serve as kind of lead structures to develop even better templates in the future. L-Norleucine, L-isoleucine, and L-leucine. Concave templates 1 and 2. Schematic presentation of the isomer

Self-assembly of metallosupramolecular rhombi from chiral concave 9,9’-spirobifluorene-derived bis(pyridine) ligands

• Rainer Hovorka,
• Sophie Hytteballe,
• Torsten Piehler,
• Georg Meyer-Eppler,
• Filip Topić,
• Kari Rissanen,
• Marianne Engeser and
• Arne Lützen

Beilstein J. Org. Chem. 2014, 10, 432–441, doi:10.3762/bjoc.10.40

• , University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä, Finland 10.3762/bjoc.10.40 Abstract Two new 9,9’-spirobifluorene-based bis(4-pyridines) were synthesised in enantiopure and one also in racemic form. These ligands act as concave templates and form metallosupramolecular [(dppp)2M2L2] rhombi with cis

• . Keywords: concave templates; metal complexes; self-assembly; self-sorting; 9,9’-spirobifluorene; supramolecular chemistry; Introduction Concave templates are versatile tools to achieve self-sorting behaviour in the self-assembly of defined aggregates from multicomponent mixtures in a social self