Copper(ii) Complexes of Two New Pyridyl–Aliphatic Amine Ligands: Synthetic, Structural, EPR, and Magnetic Studies*
Young Hoon Lee A , Hari Kristopo A , Arim Woo A , Mi Seon Won A , Shinya Hayami B , Pierre Thuéry C , Ok-Sang Jung D , Hong In Lee E , Bok Jo Kim F , Leonard F. Lindoy G and Yang Kim A HA Department of Chemistry and Advanced Materials, Kosin University, 194, Wachi-Ro, Yeongdo-gu, Busan 606-701, South Korea.
B Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
C CEA, IRAMIS, UMR 3299 CEA/CNRS, SIS2M, LCCEf, Bât.125, 91191 Gif-sur-Yvette, France.
D Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University, Pusan 609-735, South Korea.
E Department of Chemistry, Kyungpook National University, 702-701, Daegu, South Korea.
F Department of Biomedical Laboratory Science, College of Health, Kyungwoon University, Gumi-si, Gyeongsangbuk-do, 730-739, South Korea.
G School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.
H Corresponding author. Email: ykim@kosin.ac.kr
Australian Journal of Chemistry 65(7) 926-930 https://doi.org/10.1071/CH12145
Submitted: 8 March 2012 Accepted: 24 April 2012 Published: 24 May 2012
Abstract
Two new polyamine ligands, L1 and L2, incorporating pyridyl and aliphatic amine donor sites have been prepared and their reaction with copper(ii) yields the mono- and binuclear complexes [Cu(L1)](ClO4)2 (1) and [Cl2Cu(L2)CuCl(H2O)]ClO4 (2), respectively. The X-ray structure of 1 confirms that the five nitrogen donors of L1 are bound to the central copper ion to give a distorted square pyramidal coordination sphere. In 2, L2 acts as a bridging ligand with its N3-donor coordination domains separated by a m-xylylene spacer group. An unusual feature of this latter complex is that symmetrical L2 gives rise to non-equivalent coordination behaviour at the individual copper sites; while both sites display five-coordination with distorted square pyramidal arrangements, they differ in having N3Cl2- and N3ClO-donor atom sets, respectively. The electron paramagnetic resonance (EPR) spectra of both complexes are discussed. Variable temperature magnetic susceptibility data confirmed the absence of magnetic interactions in 1 while a weak antiferromagnetic interaction between copper(ii) centres occurs in 2.
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