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|標題:||Fine tuning of pentachromium(II) metal string complexes through elaborate design of ligand||作者:||Wang, W.Z.
|關鍵字:||chains;molecule;bonds;conductance||Project:||New Journal of Chemistry||期刊/報告no：:||New Journal of Chemistry, Volume 36, Issue 3, Page(s) 632-637.||摘要:||
New pentachromoium metal string complexes [Cr-5(mu(5)-L)(4)X-2] (X = Cl-, L = dppzda(2-) (1), dpzpda(2-) (2); X = NCS-, L = dppzda(2-) (3), dpzpda(2-) (4)) were designed and synthesized through pyrazine-modulation of tripyridyldiamine ligand. X-Ray crystallographic studies revealed a linear metal chain structure consisting of two quadruple Cr-Cr bonds and a separated high spin Cr(II) at an end in crystallized form. A quintet ground state was observed for all pentachromium(II) molecules by magnetic study with g values of 2.04-2.18. While the electronic structure remained unchanged after the modification of ligands, electrochemistry showed a significant change in the molecular orbital energy levels of metal string molecules. Observation of the first oxidation peak of 1 at +0.57 V and of 2 at +0.73 V revealed that these complexes are quite resistant to oxidation. Single molecular conductance measurements showed that the complex exhibited good electronic conductance.
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