Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 45, Pages 11844-11849Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1712827114
Keywords
platinum complexes; living supramolecular polymerization; block copolymers; metal-metal interactions; nanostructures
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Funding
- University of Hong Kong under the University Research Committee Strategic Research Theme on New Materials
- University Grants Committee Areas of Excellence (AoE) Scheme [AoE/P-03/08]
- General Research Fund grant from the Research Grants Council of Hong Kong Special Administrative Region, People's Republic of China [HKU17334216]
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An important feature of biological systems to achieve complexity and precision is the involvement of multiple components where each component plays its own role and collaborates with other components. Mimicking this, we report living supramolecular polymerization achieved by collaborative assembly of two structurally dissimilar components, that is, platinum(II) complexes and poly(ethylene glycol)-b-poly(acrylic acid) (PEG-b-PAA). The PAA blocks neutralize the charges of the platinum(II) complexes, with the noncovalent metal-metal and pi-pi interactions directing the longitudinal growth of the platinum(II) complexes into 1D crystalline nanostructures, and the PEG blocks inhibiting the transverse growth of the platinum(II) complexes and providing the whole system with excellent solubility. The ends of the 1D crystalline nanostructures have been found to be active during the assembly and remain active after the assembly. One-dimensional segmented nanostructures with heterojunctions have been produced by sequential growth of two types of platinum(II) complexes. The PAA blocks act as adapters at the heterojunctions for lattice matching between chemically and crystallographically different platinum(II) complexes, achieving heterojunctions with a lattice mismatch as large as 21%.
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