Metallo-Supramolecular Nanospheres via Hierarchical Self-Assembly

被引：20

作者：

Baytekin, H. Tarik ^{[1
]}

Baytekin, Bilge ^{[1
]}

Schulz, Andrea ^{[1
]}

Springer, Andreas ^{[1
]}

Gross, Thomas ^{[2
]}

Unger, Wolfgang ^{[2
]}

Artamonova, Marina ^{[1
]}

Schlecht, Sabine ^{[1
]}

Lentz, Dieter ^{[1
]}

Schalley, Christoph A. ^{[1
]}

机构：

[1] Free Univ Berlin, Inst Chem & Biochem, D-14195 Berlin, Germany

[2] Bundesanstalt Mat Forsch & Prufung, D-12203 Berlin, Germany

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 13期

关键词：

BLOCK-COPOLYMER VESICLES; COORDINATION POLYMERS; GAS-PHASE; TETRANUCLEAR COMPLEXES; TRANSITION-METAL; MICELLES; AMPHIPHILES; SURFACES; SQUARES; ARCHITECTURES;

D O I：

10.1021/cm900642p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel coordination oligo/polymer is synthesized by metal-directed self-assembly from equimolar amounts of the (dppp)M(OTf)(2) precursor complexes (dppp = bis-(diphenylphosphino)-propane, OTf = triflate; M = Pd-II or M = Pt-II) and banana-shaped bidentate dipyridyl ligands. The assemblies were characterized by ESI mass spectrometry and NMR spectroscopy. The analysis of the cloudy suspension prepared by dissolving the coordination polymer in aqueous methanol solutions indicates nanosized spherical objects to form. Evidence for vesicle formation From these metallo-supramolecular oligomers comes from (cryogenic) transmission electron microscopy (TEM, cryo-TEM). Atomic force microscopy revealed stable nanospheres on hydrophilic mica and monolayer formation on hydrophobic highly oriented pyrolitic graphite (HOPG) substrates. On mica, also torus-shaped object were observed. which are rationalized by vesicles that opened during the drying procedure and released the internal solvent. Elemental analysis of the nanoassemblies by X-ray photoelectron spectroscopy (XPS) indicates uncoordinated and coordinated pyridines in the coordination polymers that form the nanospheres. Various control experiments using different metal centers and modified ligands support the conclusions.

引用

页码：2980 / 2992

页数：13

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