Abstract
To develop donor–acceptor–donor (D–A–D) type new photo-electric conversion materials, new tetrathiafulvalene (TTF)-Mq2-TTF complexes 1 and 2 were synthesized, where two bis(n-hexylthio)tetrathiafulvalene moieties were attached to the Mq2 part (1: M = Zn, 2: M = Ni, q = 8-quinolinato) through amide bonds. UV-Vis absorption spectra of these complexes showed strong and sharp absorption maxima at 268 nm and small absorption maxima around 410 nm, corresponding to those of Znq2 and Niq2 parts. Furthermore, complexes 1 and 2 exhibited absorption tails up to a much longer wavelength region of ca. 700 nm, suggesting the appearance of charge transfer absorption from TTF to the Mq2 parts. The photoelectrochemical measurements on the thin films of these complexes casted on ITO-coated glass substrates suggest that positive photocurrents can be generated by the photoinduced intramolecular electron transfer process between the TTF and Mq2 parts.
Highlights
Physical Properties ofIn the recent studies of organic functional materials based on tetrathiafulvalene (TTF)derivatives, donor–acceptor (D–A) type dyads have attracted much interest in the fields of optoelectronic materials
Photoinduced intramolecular electron transfer (PET) process between electron-donating TTF derivatives (D) and electron-accepting parts (A) such as fluorophores, C60 and chelating ligands has yielded several photofunctional materials such as chemical sensors based on fluorescence probe functionalities, organic photovoltaic (OPV) cells and nonlinear optical devices [1,2,3,4,5,6,7]
To develop photoinduced conducting materials and photo-electric conversion materials, we have investigated the photofunctional materials using the TTF-based D–A type dyads containing strongly fluorescent parts such as 2, 5-diphenyl-1, 3, 4-oxadiazole (PPD) [8,9], 1, 3-benzothiazole (BTA) [10,11,12], fluorene [13,14] and 4, 4-difluoro-4-bora-3a, 4a-diaza-s-indacene (BODIPY) [15,16] as antennas for photoexcitation
Summary
In the recent studies of organic functional materials based on tetrathiafulvalene (TTF). TTF derivatives and Mq2 part to realize new photo-electric conversion materials. In such transition metal complexes, substitution of the central metal atom would bring about the geometrical change around the central metal atom and the resultant changes in their electronic properties. We report the synthesis, spectroscopic studies and photo-electric conversion functionality of TTF-Mq2 -TTF complexes (1: M = Zn, 2: M = Ni, q = 8-quinolinato, Chart 1) with amide bonds as spacers. We report the synthesis,ofspectroscopic studies and photo-electricqconversion functionality of TTF-Mq complexes.
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