Acid dissociation of 2,2′-dipyridylamine in non-aqueous medium when chelated to some Ru(II)N4 cores |
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| Authors: | Michael GB Drew Dipankar Datta |
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| Institution: | a School of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK
b Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Calcutta 700 032, India |
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| Abstract: | Ru(2,2′-bipyridine)2(Hdpa)](BF4)2 · 2H2O (1), Ru(1,10-phenanthroline)2(Hdpa)] (PF6)2 · CH2Cl2 (2) and Ru(4,4,4′,4′-tetramethyl-2,2′- bisoxazoline)2(Hdpa)] (PF6)2 (3) are synthesized where Hdpa is 2,2′-dipyridylamine. The X-ray crystal structures of 1 and 2 have been determined. Hdpa in 1 and 2 is found to bind the metal via the two pyridyl N ends. Comparing the NMR spectra in DMSO-d6, it is concluded that 3 has a similar structure. The pKa values (for the dissociation of the NH proton in Hdpa) of free Hdpa and its complexes are determined in acetonitrile by exploiting molar conductance. These correlate linearly with the chemical shift of the NH proton in the respective entities. |
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| Keywords: | Ruthenium N ligands Dipyridylamine Acid dissociation Crystallography |
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