Why are Fluorene-Containing Materials so Versatile? An Electronic Structure Perspective

Igor Novak; Branka Kovač

doi:10.1071/CH08328

RESEARCH ARTICLE

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Why are Fluorene-Containing Materials so Versatile? An Electronic Structure Perspective

Igor Novak ^A ^C and Branka Kovač ^B ^C

+ Author Affiliations

- Author Affiliations

^A Charles Sturt University, PO Box 883, Orange, NSW 2800, Australia.

^B Physical Chemistry Department, Ruđer Bošković Institute, HR-10002 Zagreb, Croatia.

^C Corresponding authors. Email: inovak@csu.edu.au; bkovac@irb.hr

Australian Journal of Chemistry 61(12) 981-985 https://doi.org/10.1071/CH08328
Submitted: 1 August 2008 Accepted: 10 October 2008 Published: 10 December 2008

Abstract

The HeI/HeII photoelectron spectra of substituted fluorenes (2-aminofluorene, 2,7-dibromofluorene, 2-acetylfluorene, and 9-trimethylsilylfluorene) are reported for the first time. We have observed significant changes in the π-electronic structure of the title molecules on substitution at 2-, 7-, and 9-positions and interpreted them within the theoretical framework of resonance and inductive effects. The substituents attached to fluorene at these positions govern the photophysical behaviour and properties of polymetallaynes that contain the fluorene moiety. The mediated properties include the size of the polymer bandgap, various non-linear optical properties, and the intensity and lifetime of luminescence processes. Our spectral results provide some detailed explanations of substituent influences in the form of, for example, orbital ionization energies, which can be further related to charge-transfer processes present in these metallo-organic polymers.

Acknowledgement

The authors thank the Ministry of Science, Education and Sports of the Republic of Croatia for the financial support through Project 098–0982915–2945.

References

Why are Fluorene-Containing Materials so Versatile? An Electronic Structure Perspective

Abstract

Acknowledgement

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