Structural and Electrochemical Studies of Cobalt(II) and Nickel(II) Coordination Polymers with 6-Oxonicotinate and 4,4′-Bipyridine

Chemosensors

Nabanita Chatterjee¹  Clive L. Oliver¹  Ivana Škugor Rončević²  Nives Vladislavić²  Boris-Marko Kukovec³  Vesna Sokol³ 

[1] Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa;Department of General and Inorganic Chemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia;Department of Physical Chemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia;

关键词: coordination polymers;    cobalt(II);    nickel(II);    6-hydroxynicotinate;    4,4′-bipyridine;    hydrogen-bond motifs;   

DOI  :  10.3390/chemosensors9120352

来源: DOAJ

【 摘 要 】

The 6-oxonicotinate (6-Onic) salts of a one-dimensional cationic cobalt(II) or nickel(II) coordination polymers with 4,4′-bipyridine (4,4′-bpy), namely {[Co(4,4′-bpy)(H₂O)₄](6-Onic)₂·2H₂O}_n (1) and {[Ni(4,4′-bpy)(H₂O)₄](6-Onic)₂·2H₂O}_n (2), were prepared hydrothermally by reactions of cobalt(II) nitrate hexahydrate or nickel(II) nitrate hexahydrate, respectively, 6-hydroxynicotinic acid and 4,4′-bipyridine in a mixture of ethanol and water. In the hydrogen-bonded frameworks of 1 and 2, the one-dimensional polymeric chains of {[M(4,4′-bpy)(H₂O)₄]²⁺}_n (M = Co, Ni), the 6-oxonicotinate anions and the lattice water molecules were assembled via strong intermolecular O–H···O and N–H···O hydrogen bonds and π–π interactions, leading to the formation of the representative hydrogen-bond ring motifs: trimeric R²₃(10) motif, the centrosymmetric tetrameric R²₄(8) and R²₄(12) motifs and the pentameric R⁴₅(12) motif. The isostructural coordination polymers 1 and 2 exhibited a different electrochemical behavior, as observed by cyclic voltammetry, which can be attributed to the nature of the metal ions (cobalt(II) vs. nickel(II)).

【 授权许可】

Unknown