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Synthesis and characterization of stable thiazolylazo anion radical complexes of ruthenium(II)

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Abstract

Two stable thiazolylazo anion radical complexes of ruthenium(II), [Ru(L1•−)(Cl)(CO)(PPh3)2] (1) and [Ru(L2•−)(Cl)(CO)(PPh3)2] (2) (where L1 = 2′-Thiazolylazo-2-imidazole and L2 = 4-(2′-Thiazolylazo)-1-n-hexadecyloxy-naphthalene), have been synthesized and characterized by spectroscopic and electrochemical techniques. The radical nature of the complexes has been confirmed from their room temperature magnetic moments and X-band ESR spectra. The radical complexes display a moderately intense (ε ~ 104 M−1 cm−1) and relatively broad band in 430–460 nm region. In the microcrystalline state, complexes (1) and (2) display strong ESR signals at g = 1.951 and g = 1.988, respectively. In CH2Cl2 solution, complexes (1) and (2) show a quasireversible one-electron response near −0.64 and −0.59 V, respectively, versus Ag/AgCl due to the radical redox couple [RuII(L)(Cl)(CO)(PPh3)2]/[RuII (L•−)(Cl)(CO)(PPh3)2].

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Acknowledgment

Financial assistance from the Department of Science and Technology (Grant No. SR/FTP/CS-108/2005), New Delhi, is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Assam University, Silchar, 788011, Assam, India

    Sk. Jasimuddin & Debasish Guha Thakurata

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  1. Sk. Jasimuddin
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  2. Debasish Guha Thakurata
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Correspondence to Sk. Jasimuddin.

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Jasimuddin, S., Thakurata, D.G. Synthesis and characterization of stable thiazolylazo anion radical complexes of ruthenium(II). Transition Met Chem 34, 937–942 (2009). https://doi.org/10.1007/s11243-009-9284-y

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  • DOI: https://doi.org/10.1007/s11243-009-9284-y

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