title: Polycatenar Ligand Control of the Synthesis and Self-Assembly of Colloidal Nanocrystals.
abstract: Hydrophobic colloidal nanocrystals are typically synthesized and manipulated with commercially available ligands, and surface functionalization is therefore typically limited to a small number of molecules. Here, we report the use of polycatenar ligands derived from polyalkylbenzoates for the direct synthesis of metallic, chalcogenide, pnictide, and oxide nanocrystals. Polycatenar molecules, branched structures bearing diverging chains in which the terminal substitution pattern, functionality, and binding group can be independently modified, offer a modular platform for the development of ligands with targeted properties. Not only are these ligands used for the direct synthesis of monodisperse nanocrystals, but nanocrystals coated with polycatenar ligands self-assemble into softer bcc superlattices that deviate from conventional harder close-packed structures (fcc or hcp) formed by the same nanocrystals coated with commercial ligands. Self-assembly experiments demonstrate that the molecular structure of polycatenar ligands encodes interparticle spacings and attractions, engineering self-assembly, which is tunable from hard sphere to soft sphere behavior.
authors.affiliation: Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: Diroll
authors.affiliation: Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.|Complex Assemblies of Soft Matter Laboratory (COMPASS), UMI 3254, CNRS-Solvay-University of Pennsylvania , Bristol, Pennsylvania 19007, United States.
authors.forename: Davit
authors.initials: D
authors.lastname: Jishkariani
authors.affiliation: Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
authors.forename: Matteo
authors.initials: M
authors.lastname: Cargnello
authors.affiliation: Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.|Department of Materials Science and Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Murray
authors.affiliation: Complex Assemblies of Soft Matter Laboratory (COMPASS), UMI 3254, CNRS-Solvay-University of Pennsylvania , Bristol, Pennsylvania 19007, United States.|Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, CNRS-Université de Strasbourg , 67034 cedex 2, Strasbourg, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Donnio