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Dendron Decorated Platinum(II) Acetylides for Optical Power Limiting
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2006 (English)In: Macromolecules, ISSN 0024-9297, Vol. 39, no 6, 2238-2246 p.Article in journal (Refereed) Published
Abstract [en]

The effect of dendritic substituents on a nonlinear optical chromophore for optical power limiting (OPL) has been investigated. Synthesis and characterization of bis((4-(phenylethynyl)phenyl)ethynyl)bis(tributylphosphine)platinum(II) with dendritic end groups are described. Polyester dendrimers up to the fourth generation were grown divergently using the anhydride of 2,2-bis(methylol)propionic acid (bis-MPA). The introduction of the dendritic moieties onto the NLO chromophore enables further processing of the materials using polymeric and related techniques. OPL measurements performed at 532, 580, and 630 nm show that the OPL properties improve with increasing size of the dendritic substituent. It is also shown that the addition of the dendrons increase the OPL as compared to the nondecorated bis((4-(phenylethynyl)phenyl)ethynyl)bis(tributylphosphine)platinum(II). By use of femtosecond z-scan measurements carried out at different pulse-repetition frequencies, it is shown that the two-photon absorption cross section is ~10 GM. Using pulse repetition frequencies (100 kHz-4.75 MHz) so that the time between the pulses is comparable with the triplet excited lifetime, the z-scans become dominated by excited-state absorption of excited triplet states.

Place, publisher, year, edition, pages
2006. Vol. 39, no 6, 2238-2246 p.
URN: urn:nbn:se:umu:diva-12745DOI: doi:10.1021/ma0523670OAI: diva2:152416
Available from: 2007-04-17 Created: 2007-04-17 Last updated: 2009-09-07Bibliographically approved
In thesis
1. Synthesis and optical characterization of optical power limiting platinum(II) acetylides
Open this publication in new window or tab >>Synthesis and optical characterization of optical power limiting platinum(II) acetylides
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Interactions between light and a molecule can result in reversible or irreversible changes in properties of both the light and the molecule. Of the many known interactions, nonlinear absorption is a process in which an intense light signal, for instance from a laser, can be moderated. This can be manifested either in a marked lowering of the light’s intensity or in reductions in fluctuations of its intensity. Such an effect is often termed ‘optical power limiting’ (OPL).

High power lasers can be very dangerous since their high intensity can damage or destroy eyes and optical sensors. However, there are currently no adequate protective measures against lasers that cover the entire visible region and there is an increasing demand for new or improved OPL materials. Some of the most promising optical power limiting materials are substances that combine nonlinear optical properties with high transparency in normal light, but after activation by a laser beam, their light transmittance falls extremely rapidly via so-called self-activating mechanisms. The platinum(II) acetylides comprise one class of compounds with such properties.

In this study, various OPL Pt(II) acetylides were synthesized and their nonlinear optical properties were characterized. The emphasis of the work was on preparation of the compounds, but in order to design organoplatinum chromophores for OPL, attempts were also made to obtain insight into the mechanisms of nonlinear absorption.

The work was divided into two main parts. In the first the goal was to find compounds that are good optical limiters in solution. The possibility of isolating the chromophore site by dendron shielding and the effects of incorporating a thiophene ring into the organic molecular system were also explored. In addition, a new route for synthesizing these compounds was developed. The second part was focused on incorporating the most interesting compounds into solid materials. The preparation and characterization of Pt(II) acetylides with molecular groups for covalent attachment to a silica matrix via the solution gel approach is described.

Place, publisher, year, edition, pages
Umeå: Kemi, 2007. 58 p.
Platinum acetylides, nonlinear absorption, optical power limiting, Sonogashira coupling, solution gels, thiophene
National Category
Organic Chemistry
urn:nbn:se:umu:diva-1130 (URN)978-91-7264-290-4 (ISBN)
Public defence
2007-06-01, KB3B1, KBC, Umeå, 10:00 (English)
Available from: 2007-05-10 Created: 2007-05-10 Last updated: 2009-09-07Bibliographically approved

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