Organometallic Complexes for Non-Linear Optics. 51. Second- and Third-Order Non-Linear Optical Properties of Alkynylgold Complexes*

Adam Barlow; Bandar Babgi; Marek Samoc; T. Christopher Corkery; Stijn van Cleuvenbergen; Inge Asselberghs; Koen Clays; Marie P. Cifuentes; Mark G. Humphrey

doi:10.1071/CH12054

RESEARCH FRONT

Organometallic Complexes for Non-Linear Optics. 51. Second- and Third-Order Non-Linear Optical Properties of Alkynylgold Complexes*

Adam Barlow ^A , Bandar Babgi ^A , Marek Samoc ^B ^C , T. Christopher Corkery ^A , Stijn van Cleuvenbergen ^D , Inge Asselberghs ^D , Koen Clays ^D , Marie P. Cifuentes ^A and Mark G. Humphrey ^A ^E

+ Author Affiliations

- Author Affiliations

^A Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia.

^B Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.

^C Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, Wroclaw 50-370, Poland.

^D Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium.

^E Corresponding author. Email: Mark.Humphrey@anu.edu.au

Australian Journal of Chemistry 65(7) 834-841 https://doi.org/10.1071/CH12054
Submitted: 30 January 2012 Accepted: 20 February 2012 Published: 16 April 2012

Abstract

The alkynes HC≡CC₆H₂-2,6-Et₂-4-C≡CC₆H₄-4-NO₂ (4) and HC≡CC₆H₄-4-C≡CC₆H₂-2,6-Et₂-4-C≡CC₆H₄-4-NO₂ (6) and gold alkynyl complexes Au{C≡CC₆H₂-2,5-(OEt)₂-4-C≡CC₆H₄-4-NO₂}(PPh₃) (7), Au(C≡CC₆H₂-2,6-Et₂-4-C≡CC₆H₄-4-NO₂)(PPh₃) (8), and Au(C≡CC₆H₄-4-C≡CC₆H₂-2,6-Et₂-4-C≡CC₆H₄-4-NO₂)(PPh₃) (9) have been synthesized. The linear optical properties and quadratic optical non-linearities of 7–9 have been measured, the latter by hyper-Rayleigh scattering at 1064 nm, and compared with data for the previously reported complexes Au(C≡CC₆H₄-4-NO₂)(PPh₃) (10) and Au(C≡CC₆H₄-4-C≡CC₆H₄-4-NO₂)(PPh₃) (11). The optical absorption maximum red-shifts and the first hyperpolarizabilities increase on π-system lengthening and on introduction of electron-releasing substituents on the π-bridge ring adjacent to the metal centre. The cubic non-linear optical properties of 1,4-{(PCy₃)Au(C≡C)}₂C₆H₄ (12) and {(PCy₃)Au(C≡C-4-C₆H₄C≡C)}₆C₆ (13) have been assessed by wide spectroscopic range femtosecond Z-scan studies; the maximal values of the imaginary component and the effective two-photon absorption cross-section increase markedly on proceeding from linear complex 12 to 6-fold-symmetric complex 13, an increase that is maintained when data are scaled by relative molecular weight.

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Organometallic Complexes for Non-Linear Optics. 51. Second- and Third-Order Non-Linear Optical Properties of Alkynylgold Complexes*

Abstract

References

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