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Tetrapyridine and Tetrapyrazine TTF Derivatives: Synthesis, Characterization and Preparation of a Bimetallic Co^II^ Complex by Sandra I. G. Dias; Ana I. S. Neves; Sandra Rabaça; Isabel C. Santos; Manuel Almeida is a Chemistry article available to read on EtoBox.

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## Abstract The tetra‐substituted TTF‐type donors 4,4′,5,5′‐tetrakis(2‐pyridylethylsulfanyl)tetrathiafulvalene (**1**) and 4,4′,5,5′‐tetrakis(2‐pyrazylethylsulfanyl)tetrathiafulvalene (**2**) were prepared and characterized. These donors show a redox behaviour that is comparable with similar unsubstituted TTF donors, with a small increase of the redox potentials due to the electron‐withdrawing effect of the pyridine and pyrazine groups. Single crystal X‐ray diffraction analyses show structures with a strong segregation of TTF and azo moieties. The pyridine‐substituted donor **1** was used as a bridging ligand to prepare a dinuclear Co^II^‐coordination complex [**1**Co~2~(hfac)~4~] (hfac = hexafluoroacetylacetonate) with redox properties identical to that of **1**. This dinuclear complex presents an effective magnetic moment of ca. 8 μ~B~, corresponding to nearly independent __S__ = 3/2 spins with weak antiferromagnetic interactions below 65 K. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Who reads Tetrapyridine and Tetrapyrazine TTF Derivatives: Synthesis, Characterization and Preparation of a Bimetallic Co^II^ Complex?

Author

Sandra I. G. Dias; Ana I. S. Neves; Sandra Rabaça; Isabel C. Santos; Manuel Almeida

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1434-1948)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)