Poly-CPDT films decorated with dinuclear Re(I) complex chromophore pendants: electrochemical and spectroscopic properties

Valentina Bonometti Patrizia R. Mussini 1Giuseppe D'Alfonso 2Monica Panigati 2Giovanni Rampinini 3Francesco Sannicolò 3Elsa Quartapelle Procopio 2

1. Università degli Studi di Milano, Dipartimento di Chimica Fisica ed Electrochimica (UNIMI), via Golgi, Milano 20133, Italy
2. Università degli Studi di Milano Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Via Venezian 21, Milano 20133, Italy
3. Università degli Studi di Milano, Dipartimento di Chimica Organica e Industriale, via Venezian 21, Milano 20133, Italy

Abstract

Immagine1and2_1.JPG In our current development of new classes of luminescent dinuclear Re(I) complexes, looking for innovative hybrid mate­rials for solid-state devices, we have synthe­sized and electrochemically characterized the compound Re2(CO)6(μ-H)(μ-3Me-pydz)(μ-OOC- cpdt), a novel conjugate between a luminescent com­plex and a cyclopentabithiophene (cpdt) unit. By comparison with the corresponding free dinuclear Re complex and with the free HOOCcpdt ligand the CV peaks of the new conjugate have been assigned to the different redox centers. Efficient and very regular electro­che­mical poly­meriza­tion has been obtain­ed on GC, Pt, and ITO electro­des as a consequence of the high polymerization ability and regioselectivity of the terminal α-thiophene positions of cpdt. The resulting films have been characterized by CV, EQCM, EIS and UV-vis spectro­electro­chemistry. They are stable even upon repeated cycling, exhibiting two subsequent reversible oxidation peaks, whose relative charge ratio is regularly de­pending on the potential scan rate (possibly, on account of different rates of the counter ion ingress/egress). They also exhibit conspicuous charge trapping features, in terms of both quantity and stability, and excellent electrochromic properties

 

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Presentation: Short communication at SMCBS'2011 International Workshop, by Valentina Bonometti
See On-line Journal of SMCBS'2011 International Workshop

Submitted: 2011-09-05 09:28
Revised:   2011-09-05 17:45