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Title: Influence of H-bonding on self-assembly and tunable dual-emission of carbazole-based Zn(II)-terpyridine metallocycles
Authors: Sun, Handong
Gao, Yang
He, Tingchao
Hu, Peng
Koh, Teck Ming
Grimsdale, Andrew C.
Keywords: DRNTU::Engineering::Materials
Issue Date: 2014
Source: Gao, Y., He, T., Hu, P., Koh, T. M., Sun, H., & Grimsdale, A. C. (2014). Influence of H-Bonding on Self-Assembly and Tunable Dual-Emission of Carbazole-Based Zn(II)-Terpyridine Metallocycles. Macromolecular Chemistry and Physics, 215(8), 753-762.
Series/Report no.: Macromolecular chemistry and physics
Abstract: Two carbazole derivatives with terpyridine units attached to the 3,6-positions are synthesized, 1 with a hydrogen at the 9-position and 2 bearing a dodecyl chain there, to evaluate the influence of H-bonds on their self-assembly behavior with metal ions. The unalkylated derivative 1 assembles with zinc ions to form a single product identified by NMR, electrospray ionisation mass spectrometry (ESI-MS), and X-ray photoelectron spectroscopy (XPS) as a pentametric metallocycle (Zn-1), whereas 2 forms a mixture of two assemblies (Zn-2). The pentamer Zn-1 shows tunable dual emission in the blue and green regions by varying the solvent and excitation wavelength, and molecular packing studies by powder X-ray diffractometry (XRD), transmission electron microscopy (TEM), polarising optical microscopy (POM), and atomic force microscopy (AFM) reveals a high propensity to form ordered layers. A fluorescence quenching experiment of electron-rich Zn-1 with C60 shows a high association constant of Ksv = 3.2 × 105m−1, suggesting effective charge transfer between Zn-1 and C60 molecules.
ISSN: 1022-1352
DOI: 10.1002/macp.201300737
Rights: © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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