Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Preparation, characterization, and electrical properties of dual-emissive Langmuir-Blodgett films of some europium-substituted polyoxometalates and a platinum polyyne polymer

Language

English

Abstract

A new series of organometallic/inorganic composite Langmuir-Blodgett (LB) films consisting of a rigid-rod polyplatinyne polymer coordinated with 2,7-bis(buta-1,3-diynyl)-9,9-dihex- ylfluorene (denoted as PtP) as the π-conjugated organometallic molecule, an europium-substituted polyoxometalate (POM; POM = Na9EuW10O36,K 13[Eu(SiW11O39)2]and K 5EuSiW11H2O)2]) as the inorganic component, and an amphiphilic behenic acid (BA) as the auxiliary film-forming agent were prepared. Structural and photophysical characterization of these LB films were achieved by π-A isotherms, absorption and photoluminescence spectra, atomic force microscopy imaging, scanning tunneling microscopy, and low-angle X-ray diffraction. Our experimental results indicate that stable, well-defined, and well-organized Langmuir and LB films are formed in pure water and POM subphases, and the presence of Eu-based POM in the subphase causes an area expansion. It is proposed that a lamellar layered structure exists for the PtP/BA/POM LB film in which the POM and PtP molecules can lay down with the interfacial planes. Luminescence spectra of the prepared hybrid LB films show that nearwhite emission spectra can be obtained due to the dual-emissive nature of the mixed PtP/POM blends. These Pt-polyyne-based LB films displayed interesting electric conductivity behavior. Among them, PtP/BA/POM 13-layer films showed a good electrical response, with the tunneling current up to ±100 nA when the voltage was monitored between - 1and 7 V. © 2010 Wiley Periodicals, Inc.

Keywords

Fluorene, LB film, Luminescence, Metal polyynes, Metal-polymer complexes, Metallopolymers, Polyoxometalate, Synthesis, Thin films, Transition metal chemistry

Publication Date

2010

Source Publication Title

Journal of Polymer Science Part A: Polymer Chemistry

Volume

48

Issue

4

Start Page

879

End Page

888

Publisher

Wiley

DOI

10.1002/pola.23839

Link to Publisher's Edition

http://dx.doi.org/10.1002/pola.23839

ISSN (print)

0887624X

ISSN (electronic)

10990518

This document is currently not available here.

Share

COinS