Syntheses and characterizations of square planar nickel(II) complexes with pendant ligands: Examples of bi-dentate bonding modes of potentially tri- and tetra-dentate Schiff bases

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• 作者：Subhendu Bag ; Prasanta Kumar Bhaumik ; Subrata Jana ; Mithun Das ; Prasanta Bhowmik ; Shouvik Chattopadhyay
• 关键词：Nickel(II) ; Schiff base ; Pendant ; Crystal structure ; H-bonding
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：28 November, 2013
• 年：2013
• 卷：65
• 期：Complete
• 页码：229-237
• 全文大小：2279 K

文摘

Four square planar nickel(II) complexes, [Ni(L¹)₂] (1), [Ni(L²)₂] (2), [Ni(L³)(NHEt₂)] (3) and [Ni(han)₂] (4), where HL¹ = 1-(3-hydroxypropyliminomethyl)naphthalene-2-ol, HL² = 1-(5-hydroxy-3-oxapentyliminomethyl)naphthalene-2-ol, H₂L³ = 2-(2-hydroxy-3-methoxybenzylideneamino)phenol and Hhan = 1-hydroxy-2-acetonaphthone, have been prepared and characterized by elemental analyses, IR and UV-Vis spectroscopy and single crystal X-ray diffraction studies. The potential tridentate ONO-donor ligand HL¹ and potential tetradentate ONOO-donor ligand HL² coordinate the nickel(II) only through the amine N and phenolic O to form complexes 1 and 2 respectively, i.e. the ligands act as pendant ligands. On the other hand, the potential tetradentate ONOO-donor Schiff base H₂L³ coordinates the nickel(II) only through the amine N atom and two phenolic O atoms to form complex 3, i.e. it also acts as pendant ligand. Complex 4 is formed by the reaction of nickel(II) with 1-hydroxy-2-acetonaphthone. H-bonding, C-H?¦Ð and ¦Ð?¦Ð interactions form supra-molecular assembly.