

Synthesis, spectroscopic studies and X-ray structure determination of two mononuclear copper complexes derived from the Schiff base ligand N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene)ethane-1,2-diamine
Pokpa Haba (1)









(1) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(2) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(3) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(4) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(5) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(6) Department of Chemistry, University of Nouakchott, Nouakchott, 130301, Mauritania
(7) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(8) Department of Chemistry, University Cheikh Anta Diop, Dakar, 10700, Sénégal
(9) Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay, 1, av. de la Terrasse, 91198 Gif-sur-Yvette, France
(*) Corresponding Author
Received: 15 Apr 2019 | Revised: 02 Jul 2019 | Accepted: 05 Jul 2019 | Published: 30 Sep 2019 | Issue Date: September 2019
Abstract
Reactions of the Schiff base N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene) ethane-1,2-diamine (HL), synthesised in situ, with chloride or thiocyanate copper (II) salt; afforded two new mononuclear complexes, [Cu(HL)Cl2]·H2O (1) and [Cu(HL)(SCN)2] (2). These compounds have been studied and characterized by elemental analysis, IR and UV-Vis spectroscopies, electrochemistry, molar conductivity and room temperature magnetic measurements. Single crystal X-ray structure determination of the complexes revealed the presence of neutral moieties in the asymmetric unit. The mononuclear (1) crystallises in the monoclinic space group P21/c with the following unit cell parameters a = 7.4355(3) Å, b = 7.2952(3) Å, c = 26.2729(11) Å, β = 93.461(4)°, V = 1422.52(10) Å3, Z = 4, R1 = 0.033 and wR2 = 0.082 and the mononuclear complex (2) crystallises in the monoclinic space group C2/c with the following unit cell parameters a = 26.2578(7) Å, b = 7.4334(2) Å, c = 16.6237(5) Å, β = 99.089(3)°, V = 3203.95(16) Å3, Z = 8, R1 = 0.037 and wR2 = 0.104. In both complexes the ligand acts in tridentate fashion and the coordination environment of the copper atom can be described as distorted square pyramidal. The crystal lattice of the complex 1 is stabilized by electrostatic forces of attraction and O–H···Cl, C–H···O, N–H···Cl, and C–H···Cl, hydrogen bonding interactions while the crystal lattice of the complex 2 is stabilized by N–H···S and C–H···N.
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DOI: 10.5155/eurjchem.10.3.201-208.1881
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