Interaction of copper(II) and palladium(II) with linked 2,2′-dipyridylamine derivatives: Synthetic and structural studies |
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| Authors: | Bianca Antonioli David J Bray Jack K Clegg Kerstin Gloe Karsten Gloe Anne Jäger Katrina A Jolliffe Olga Kataeva Leonard F Lindoy Peter J Steel Christopher J Sumby Marco Wenzel |
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| Institution: | 1. Department of Chemistry and Food Chemistry, Technical University Dresden, 01062 Dresden, Germany;2. Centre for Heavy Metals Research, School of Chemistry, University of Sydney, NSW 2006, Australia;3. A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan 420088, Russia;4. Department of Chemistry, University of Canterbury, Christchurch, New Zealand |
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| Abstract: | Interaction of copper(II) salts with 2,2′-dipyridylamine (1), N-cyclohexylmethyl-2,2′-dipyridylamine (2), di-2-pyridylaminomethylbenzene (3), 1,2-bis(di-2-pyridylaminomethyl)-benzene (4), 1,3-bis(di-2-pyridylaminomethyl)benzene (5), 1,4-bis(di-2-pyridylaminomethyl)benzene (6), 1,3,5-tris(di-2-pyridylaminomethyl)benzene (7) and 1,2,4,5-tetrakis(di-2-pyridylaminomethyl)benzene (8) has yielded the following complexes: Cu(2)(μ-Cl)Cl]2, Cu(3)(μ-Cl)Cl]2 · H2O, Cu2(4)(NO3)4], Cu2(5)(NO3)4] · 2CH3OH, Cu2(6)(CH3OH)2(NO3)4], Cu4(8)](NO3)4] · 4H2O while complexation of palladium(II) with 1, 4, 5 and 6 gave Pd(1)2](PF6)2 · 2CH3OH, Pd2(4)Cl4], Pd2(4)(OAc)4], Pd2(5)Cl4], Pd2(6)Cl4] and Pd2(6)(OAc)4] · CH2Cl2, respectively. X-ray structures of Cu(2)(μ-Cl)Cl]2, Cu(3)(μ-Cl)Cl]2 · 2C2H5OH, Cu2(6)(CH3OH)2(NO3)4], Pd(1)2](PF6)2 · 2CH3OH, Pd2(4)(OAc)4] · 4H2O and Pd2(6)(OAc)4] · 2CH2Cl2 are reported. In part, the inherent flexibility of the respective ligands has resulted in the adoption of a diverse range of coordination geometries and lattice arrangements, with the structures of Pd2(4)(OAc)4] · 4H2O and Pd2(6)(OAc)4] · 2CH2Cl2, incorporating the isomeric ligands 4 and 6, showing some common features. Liquid–liquid (H2O/CHCl3) extraction experiments involving copper(II) and 1–3, 5, 7and 8 show that the degree of extraction depends markedly on the number of dpa-subunits (and concomitant lipophilicity) of the ligand employed with the tetrakis-dpa derivative 8 acting as the most efficient extractant of the six ligand systems investigated. |
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| Keywords: | Copper(II) Palladium(II) Polypyridyl X-ray structure Solvent extraction |
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