Photocatalytic coatings based on a zinc(ii) phthalocyanine derivative immobilized on nanoporous gold leafs with various pore sizes

Abstract

A series of hybrid materials consisting of a zinc(ii) phthalocyanine derivative immobilized on nanoporous gold leafs with various pore sizes was prepared and investigated regarding its singlet oxygen sensitization activity.

Comparison of the photocatalytic activity of novel hybrid photocatalysts based on phthalocyanines, subphthalocyanines and porphyrins immobilized onto nanoporous gold

“…The photocatalytic activity of the zinc(II) phthalocyanine (ZnPc) derivatives immobilized on various npAu supports had been investigated already in detail in the photooxidation of DPBF. 10,23,25 However, this class of hybrid material was also analyzed in the photooxidation of DPF, acting as reference system in comparison to the novel hybrid materials employing other macrocyclic metal complexes. For this purpose, two zinc(II) phthalocyanines containing either propynoxy-(1) or hexynoxy-(2) peripheral substituents were studied in the photooxidation reaction of DPF before and aer immobilized on a npAu powder support.…”

“…[17][18][19][20][21] The dealloying time thereby is a crucial parameter for the average size of the obtained pores and ligaments in the material, which also have a direct inuence on the position of the surface plasmon resonance. [22][23][24] In this study we used a npAu powder with average pore size of around 40 nm (Fig. 1a) showing a typical optical behavior with the longitudinal part of the plasmon resonance at 490 nm and the transverse part at around 580 nm (Fig.…”

Impact of photosensitizer orientation on the distance dependent photocatalytic activity in zinc phthalocyanine–nanoporous gold hybrid systems

“…2). [25][26][27] In a rst step, the surface of the npAu powder was functionalized with an azide-terminating SAM using acetylprotected azidoalkylthioates. For the systematic variation of the distance between the immobilized photosensitizer and the npAu surface, SAMs with alkyl chain lengths ranging from n SAM ¼ 3 to 11 CH 2 groups between the sulphur anchor and the free azide group were employed.…”

“…This conrms previous results of selected systems as described previously by us. 26,27 The amount of immobilized sensitizer in every hybrid system was determined by quantication of the amount of Zn in the system by inductively coupled plasma mass spectrometry (ICP-MS) aer dissolution of the corresponding sample in ultrapure aqua regia. The obtained values as well as the light exposed fractions of the immobilized sensitizer are summarized in Table 1.…”

“…We recently reported a comparable system where a ZnPc derivative was immobilized on different shaped npAu supports, as examples for a truly heterogeneous monolithic system, a heterogeneous powder catalyst as well as a photocatalytic coating. [25][26][27] These new hybrid photocatalysts showed high overall 1 O 2 sensitization activities, where the activity was an order of magnitude above the activity of the same amount of the photosensitizer in solution. 26 By selective irradiation of only the plasmon resonance of npAu (Fig.…”