A versatile synthetic strategy for nanoporous gold–organic hybrid materials for electrochemistry and photocatalysis
摘要:
Nanoporous gold (npAu) was employed as high surface area substrate for immobilization of redox- and photooxidative-active organic molecules. A two-step synthetic routine is demonstrated as a versatile and robust method for immobilization of various molecules. First, self-assembled monolayers (SAMs) of thiols containing an azide moiety were prepared on npAu substrates. Then, alkyne-modified ferrocene, tetrathiafulvalene, and zinc(II)phthalocyanine derivatives were covalently bound via the click reaction to this linker. Following the provided synthetic procedures high performance composite materials are generated for electrochemistry and photochemistry. The robust bonding between the organic functional group and the gold support provides stability even under strongly oxidizing conditions (applied potential or singlet oxygen). (C) 2014 Elsevier Ltd. All rights reserved.
Photophysical and non-linear optical behavior of novel tetra alkynyl terminated indium phthalocyanines: Effects of the carbon chain length
作者:Owolabi M. Bankole、Jonathan Britton、Tebello Nyokong
DOI:10.1016/j.poly.2014.12.020
日期:2015.3
We report on the synthesis, photophysical and nonlinear optical behavior of tetra-substituted alkynyl indium phthalocyanine complexes (3a and 3b). Both complexes showed large triplet quantum yields. Nonlinear optical properties were also evaluated for the two complexes at a wavelength of 532 nm using nanosecond Z-scan technique in dimethylsulfoxide. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The underlining 2PA and observed RSA were subjected to further scrutiny by comparing the analytical absorption model to the transmittance optical absorption theory. The theoretical results were in good agreement to the observed RSA and the 2PA mechanism. Large two-photon absorption cross-section (1.29 x 10(-42) and 1.15 x 10(-42) cm(4) s/photon), third-order susceptibility (2.10 x 10(-14) and 2.15 x 10(-14) esu) and hyperpolarizability (2.70 x 10(-32) and 3.19 x 10(-32) esu) were estimated for complex 3a and 3b, respectively. (C) 2014 Elsevier Ltd. All rights reserved.