A new familiy of heteroleptic ruthenium(II) polypyridyl complexes for sensitization of nanocrystalline TiO2 films

Lingamallu Giribabu; Takeru Bessho; Mareedu Srinivasu; Challuri Vijaykumar; Yarasi Soujanya; Veeranagari Gopal Reddy; Paidi Yella Reddy; Jun-Ho Yum; Michael Grätzel; Mohammad Khaja Nazeeruddin

doi:10.1039/C0DT01417F

A new familiy of heteroleptic ruthenium(ii) polypyridyl complexes for sensitization of nanocrystalline TiO₂ films†

Lingamallu Giribabu,*^a Takeru Bessho,^b Mareedu Srinivasu,^a Challuri Vijaykumar,^a Yarasi Soujanya,^c Veeranagari Gopal Reddy,^d Paidi Yella Reddy,^d Jun-Ho Yum,^b Michael Grätzel^b and Mohammad Khaja Nazeeruddin*^b

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^a Nanomaterials Laboratory, Inorganic & Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad, India
E-mail: giribabu@iict.res.in
Fax: 91-40-27160921
Tel: +91-40-27193186

^b Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of basic Sciences, Swiss Federal Institute of Technology, Lausanne, Switzerland
E-mail: mdkhaja.nazeeruddin@epfl.ch
Fax: +41-21-6934111
Tel: +41-21-6936124

^c Molecular Modelling Group, Indian Institute of Chemical Technology, Hyderabad, India

^d Aisin Cosmos R&D Co. Ltd., HUDA Complex, Tarnamaka, India

Abstract

Two new heteroleptic ruthenium(II) photosensitizers that contains 2,2′;6,2′′-terpyridine with extended π-conjugation with donor groups, a 4,4′-dicarboxylic acid-2,2′-bipyridine anchoring ligand and a thiocyanate ligand have been designed, synthesized and fully characterized by CHN, mass spectrometry, UV-vis and fluorescence spectroscopies and cyclic voltammetry. The new sensitizers have either 3,5-di-tert-butyl phenyl (m-BL-5) or triphenylamine (m-BL-6) groups, where the molar extinction coefficient of both the sensitizers is higher than the analogous ruthenium dyes. Both the sensitizers were tested in dye-sensitized solar cells using two different redox electrolytes.

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A new familiy of heteroleptic ruthenium(ii) polypyridyl complexes for sensitization of nanocrystalline TiO₂ films†

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A new familiy of heteroleptic ruthenium(II) polypyridyl complexes for sensitization of nanocrystalline TiO₂ films

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Dalton Transactions