title: A Ca(2+)-, Mg(2+)-, and Zn(2+)-Based Dendritic Contractile Nanodevice with Two pH-Dependent Motional Functions.
abstract: A contractile dendritic motional device is reported where metal ions with biological importance--Ca(2+) (the main regulatory and signaling species of the natural muscles), Mg(2+), and Zn(2+)--initiate two kinds of motional functions. The first motional function is the metal-ion-induced contraction of a linear strand into a Z-shaped dinuclear complex, and the second one is the change of the height of Z-shaped complexes via transmetalation. By means of the pH-dependent counterligand tren, the two motional features of the machine can depend on alternate additions of acid and base. An optical response is associated with the conversion of the linear form (which is yellow) into the metalated Z-shaped one (which is red).
authors.affiliation: Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), CNRS and Université de Strasbourg, 8 Allée Gaspard Monge, 67000 Strasbourg (France). mstadler@unistra.fr.|Institut für Nanotechnologie (INT), Karlsruhe Institut für Technologie (KIT), 76344 Eggenstein-Leopoldshafen (Germany). mstadler@unistra.fr.
authors.forename: Adrian-Mihail
authors.initials: AM
authors.lastname: Stadler
authors.affiliation: Service de Radiocristallographie, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg (France).
authors.forename: Lydia
authors.initials: L
authors.lastname: Karmazin
authors.affiliation: Service de Radiocristallographie, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg (France).
authors.forename: Corinne
authors.initials: C
authors.lastname: Bailly
keywords: calcium; contraction; dendrimers; molecular machines; transmetalation