Copper(II) and nickel(II) complexes of pyridylamido hexadentate ligands: chemical speciation and spectroscopic studies |
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| Affiliation: | 1. GRECI, Groupe de Recherche en Chimie Inorganique, Faculté des Sciences, Université de Reims Champagne-Ardenne, Moulin de la Housse, BP 1039, Reims Cedex 2 51687, France;2. LIMSAG, Laboratoire d’Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, UMR CNRS 5633, Faculté des Sciences “Gabriel”, Université de Bourgogne, 6 Boulevard Gabriel, Dijon 21100, France;1. School of Postgraduate, Liaoning University of Traditional Chinese Medicine, Shenyang 11660, China;2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;3. Institute of Process Engineering and Chinese Academy of Sciences, Beijing 100190, China;4. College of Chemistry and Materials, Hebei Normal University, Shijiazhuang 050016, China;5. Two Five Eight Health Technology Co., Ltd, Beijing 100045, China;6. The Third School of Clinical Medicine of Peking University, Beijing 100083, China;7. Ninghai Doubly Advanced Material Co., Ltd, Ninghai 315602, China;8. Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA;1. Department of Chemistry, Razi University, Kermanshah, Iran;2. School of Chemistry, University College of Science, University of Tehran, Tehran, Iran;3. Department of Nuclear Science and Technology Research Institute, Tehran, Iran;4. Laboratoire de Chimie Analytique et Minerale, UMR 778, ULP/CNRS/IN2P3(LC4), ECPM, 25 Rue Becquerel, F-67087, Strasbourg Cedex, France;5. Department of Computer Science, Faculty of Mathematics, University of Mazandaran, Babolsar, Iran;1. Graduate Institute of Veterinary Pathobiology, National Chung Hsin University, Taichung 402, Taiwan;2. Division of Animal Resources, Animal Technology Laboratories, Agricultural Technology, Miaoli 350, Taiwan;3. National Laboratory Animal Center, National Applied Research Laboratories Research Institute, Taipei 115, Taiwan;4. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan;5. Liver Center, Cathay General Hospital Medical Center, Taipei 106, Taiwan;6. Department of Exercise and Health Science, National Taipei University of Nursing and Health Sciences, Taipei 112, Taiwan;7. School of Medicine, Taipei Medical University College of Medicine, Taipei 110, Taiwan;1. Department of Thoracic Surgery, The Second People''s Hospital of Weifang, China;2. Department of Oncology, Yantaishan Hospital, China;3. Department of Thoracic Surgery, Binzhou People''s Hospital, China;1. Kazan National Research Technical University named after A.N.Tupolev – KAI, 10, K.Marx Str., 420111, Kazan, Russian Federation;2. Institut Pprime, UPR 3346 CNRS, Université de Poitiers, ENSMA, Batiment B25: 2, rue Pierre Brousse, TSA 41105, 86073 POITIERS Cedex 9, France |
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| Abstract: | Two novel potentially hexadentate ligands, 1,10-(2-bis picolinamide)-4,7-diazadecane (pycdpnen) and 1,8-bis(2-picolinamide)-3,6-dioxaoctane (pycdado) have been synthesised as their hydrochloride salt; its protonation constants and the stability constants of the copper(II) and nickel(II) chelates have been determined by potentiometry. Amide groups deprotonation permits the formation of [MLH−1]+ species in all cases, while only pycdado gives [MLH−2] species. The solid complexes of copper and nickel with the neutral and the deprotonated ligands have been synthesised and characterised by IR, UV–Vis and ESR spectroscopy. The amidic groups are coordinated through the oxygen atoms in all solid complexes [ML](ClO4)2 (M=Cu2+ and Ni2+). The complexes obtained with the deprotonated forms of the ligands imply the coordination through the nitrogen atoms of the amidic groups. |
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