Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 3, Pages 2786-2795Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12584
Keywords
platinum; self-assembly; nanostructures; supramolecular; noncovalent interactions
Funding
- University of Hong Kong under the University Research Committee (URC) Strategic Research Theme on New Materials
- University Grants Committee Areas of Excellence (AoE) Scheme [AoE/P-03/08]
- National Basic Research Program of China (973 Program) [2013CB834701]
- General Research Fund (GRF) grant from the Research Grants Council of Hong Kong Special Administrative Region, P. R China [HKU17304715]
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A series of alkynylplatinum(II) terpyridine complexes with triethylene glycol units was synthesized, and their self-assembly properties were investigated in solution by UV-vis absorption, emission, and H-1 NMR spectroscopy. The aggregation behaviors of several water-soluble complexes were investigated in aqueous media. Some of them were found to give rise to uniform fibers, suggesting the important role that triethylene glycol units has in regulating their self-assembly properties. Further modifications of these structures through the incorporation of alkyl chains and changes in counter-anions have rendered the complexes more amphiphilic in nature, and the effect of their alkyl chain lengths was studied and optimized. The distinguishable color and spectral changes upon variations in solvent compositions might have potential applications in developing colorimetric and luminescent probes for the detection of microenvironment change. Furthermore, an optimum chain length, i.e., n-butyl chain, is required for the formation of stable and ordered nanostructures. This represents a delicate balance among Pt center dot center dot center dot Pt, pi-pi stacking, and hydrophobic hydrophobic interactions and provides guiding principles into the construction of supramolecular materials with practical applications.
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