1. Significant differences between solid state and solution photochemistry and photophysics of mesogenic organometallic gold complexes
- Author
-
Tanner, Kevin, Marineau-Plante, Gabriel, Schlachter, Adrien, Karsenti, Paul-Ludovic, Soldera, Armand, and Harvey, Pierre D.
- Subjects
Raman spectroscopy -- Usage ,Coordination compounds -- Properties -- Structure ,Organometallic compounds -- Properties -- Structure ,Photochemistry -- Analysis -- Methods ,Mass spectrometry -- Usage ,Gold compounds -- Properties -- Structure ,Chemical synthesis -- Methods ,Chemistry - Abstract
Five new gold complexes 4-RO[C.sub.6][H.sub.4]C = CAuN = C[C.sub.6][H.sub.4]-4-OR' (R/R' = C[H.sub.3]/[C.sub.9][H.sub.19] ([C.sub.1][N.sub.9]), [C.sub.15][H.sub.31]/[C.sub.9][H.sub.19] ([C.sub.15][N.sub.9]), [C.sub.6][H.sub.13]/[C.sub.15][H.sub.31] ([C.sub.6][N.sub.15]), [C.sub.9][H.sub.19]/[C.sub.15][H.sub.31] ([C.sub.9][N.sub.15]), [C.sub.12][H.sub.25]/[C.sub.15][H.sub.31] ([C.sub.12][N.sub.15])) were synthesized and characterized and [.sup.13]C NMR, IR, Raman spectroscopy, and high resolution mass spectrometry). Their organized smectic phases were investigated by TGA, DSC, powder XRD, and polarized light optical microscopy, and the solids are found to have crystalline and amorphous domains. No evidence for Au... Au interactions was observed. The steady state and time-resolved absorption and emission properties at 298 and 77 K were examined, and surprisingly, the excited lifetime of the triplet excited state in the solid state is extremely short-lived ( Key words: gold complexes, gold nanoparticles, photochemistry, photophysics, mesogens. Nous avons synthétisé cinq nouveaux complexes d'or de formule 4RO[C.sub.6][H.sub.4]C = CAuN=C[C.sub.6][H.sub.4]-4OR (/) (R/R' = C[H.sub.3]/[C.sub.9][H.sub.19] ([C.sub.1][N.sub.9]), [C.sub.15][H.sub.31]/[C.sub.9][H.sub.19] ([C.sub.15][N.sub.9]), [C.sub.6][H.sub.13]/[C.sub.15][H.sub.31] ([C.sub.6][N.sub.15]), [C.sub.9][H.sub.19]/[C.sub.15][H.sub.31] ([C.sub.9][N.sub.15]) et [C.sub.12][H.sub.25]/[C.sub.15][H.sub.31] ([C.sub.12][N.sub.15])) que nous avons caractérisés par spectroscopic RMN [H.sub.1]/[C.sub.13], IR et Raman et par spectrométrie de masse à haute résolution. Nous avons étudié leurs phases smectiques organisées par analyse thermogravimétrique (ATG), calorimétrie différentielle à balayage (DSC), diffraction des rayons X (DRX) sur poudre et micro s copie optique en lumière polarisée, pour en déduire que le solide comporte des domaines cristallins et amorphes. Aucun signe de la présence d'interactions Au... Au n'a été observé. Nous avons examiné leurs propriétés d'absorption et d'émission à l'état d'équilibre et à résolution temporelle à 298 K et à 77 K et, étonnamment, la durée de vie de l'état triplet excité à l'état solide est extrêmement courte ( Mots-clés : complexes d'or, nanoparticules d'or, photochimie, photophysique, mésogènes., Introduction Since the early report of the organometallic ([[êta].sup.1]-ethynyl)-gold(I)-isocyanide synthon, [Au], in 1962, (1) the design of materials based on this motif has been the topic of a long-standing interest. [...]
- Published
- 2022
- Full Text
- View/download PDF