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Dendron Decorated Platinum(II) Acetylides for Optical Power Limiting
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2006 (Engelska)Ingår i: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 39, nr 6, s. 2238-2246Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2006. Vol. 39, nr 6, s. 2238-2246
Identifikatorer
URN: urn:nbn:se:umu:diva-12745DOI: doi:10.1021/ma0523670OAI: oai:DiVA.org:umu-12745DiVA, id: diva2:152416
Tillgänglig från: 2007-04-17 Skapad: 2007-04-17 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
Ingår i avhandling
1. Synthesis and optical characterization of optical power limiting platinum(II) acetylides
Öppna denna publikation i ny flik eller fönster >>Synthesis and optical characterization of optical power limiting platinum(II) acetylides
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Umeå: Kemi, 2007. s. 58
Nyckelord
Platinum acetylides, nonlinear absorption, optical power limiting, Sonogashira coupling, solution gels, thiophene
Nationell ämneskategori
Organisk kemi
Identifikatorer
urn:nbn:se:umu:diva-1130 (URN)978-91-7264-290-4 (ISBN)
Disputation
2007-06-01, KB3B1, KBC, Umeå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-05-10 Skapad: 2007-05-10 Senast uppdaterad: 2009-09-07Bibliografiskt granskad

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Carlsson, MarcusEliasson, Bertil

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