Article history: Multiporphyrin arrays are large, -conjugated chromophores with high absorption efﬁciency and strong Received 15 June 2017 chemical stability that play an important role in supramolecular and advanced material sciences. Received in revised form 7 August 2017 Palladium-directed self-assembly of multiporphyrin array ultrathin ﬁlms was achieved on substrate sur- Accepted 18 August 2017 faces using oxo[5,10,15,20-tetra(4-pyridyl)porphyrinato]titanium (IV) complex [TiO(TPyP)] as a linker Available online 25 August 2017 and sodium tetrachloropalladate (Na PdCl ) as a connector. The Pd-TiOTPyP ﬁlms as prepared were char- 2 4 acterized by using UV–vis absorption and X-ray photoelectron spectroscopy, as well as by atomic force Keywords: and scanning electron microscopy. The Soret absorption band of TiOTPyP was observed to red shift by Multiporphyrin arrays 6 nm when the Pd-TiOTPyP multilayer-modiﬁed quartz substrate was immersed in an aqueous solution Layer-by-layer assembly containing hydrogen peroxide. This was attributed to the formation of a TiO TPyP monoperoxo complex. Hydrogen peroxide sensing This oxidation reaction could be accelerated in an acidic solution. Furthermore, the immobilized Pd- Photocurrent generation Photochromism TiOTPyP multilayers could act as light-harvesting units for photocurrent generation and photochromism of viologens, with strong stability, reproducibility, and recyclability. The photocurrent density could be enhanced in electrolyte
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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