Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Preparation, luminescence and photoelectric properties of Langmuir–Blodgett films of alkynylplatinum(II)–zinc(II) porphyrinate/heteropolyoxometalate hybrid composites

Language

English

Abstract

A new class of organometallic/inorganic hybrid Langmuir-Blodgett (LB) films, consisting of rigid-rod alkynylplatinum(II)-zinc(II) porphyrinate complex (OMA) as the π-conjugated donor-acceptor-type molecule and tungsto(molybdo)phosphoric heteropolyacids (HPA) (HPA = H3PMo 12O40 and H3PW12O40, abbreviated as HPMo12 and HPW12, respectively) of the Keggin structure as the inorganic component, were prepared and characterized by π-A isotherms, UV-vis absorption and luminescence spectra, low-angle X-ray diffraction, scanning tunneling microscopy and surface photovoltage spectroscopy. Our experimental results indicate that stable, well-defined and well-organized Langmuir and LB films have been formed in pure water and heteropolyacid subphase. They typically have a highly organized lamellar structure in which a monolayer of HPA is most likely embedded inside the OMA molecular space formed by long chains of PBu3. Luminescence spectra of these hybrid LB films show that HPMo12 and HPW12 can enhance the emission of OMA to some extent. These LB composites show good photovoltage responses and a photovoltage of 79 μV can be obtained for the OMA/HPMo12 system when it is excited by light. The monolayer LB films on ITO wafer can also display interesting electrical conductivity. © 2011 Elsevier B.V. All rights reserved.

Keywords

Alkyne, Heteropolyacid, Photoluminescence, Platinum, Porphyrin, Zinc

Publication Date

2011

Source Publication Title

Journal of Organometallic Chemistry

Volume

696

Issue

6

Start Page

1319

End Page

1324

Publisher

Elsevier

DOI

10.1016/j.jorganchem.2010.12.018

ISSN (print)

0022328X

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