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Helical 1D Coordination Polymers − Structure and Magnetic Properties of catena ‐Poly[chloro(μ‐({2‐[(hydroxyimino)methyl]phenoxy}acetato‐ N , O , O ,O′)copper( II )]
Author(s) -
Shova Sergiu,
Novitchi Ghenadie,
Gdaniec Maria,
Caneschi Andrea,
Gatteschi Dante,
Korobchenko Ludmila,
Voronkova Violeta K.,
Simonov Yurii A.,
Turta Constantin
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200212)2002:12<3313::aid-ejic3313>3.0.co;2-k
Subject(s) - chemistry , electron paramagnetic resonance , copper , crystallography , magnetic susceptibility , carboxylate , antiferromagnetism , intramolecular force , ligand (biochemistry) , ion , stereochemistry , nuclear magnetic resonance , biochemistry , physics , receptor , organic chemistry , condensed matter physics
A new compound [CuHLCl] n , where H 2 L is the product of the condensation reaction between 2‐formylphenoxyacetic acid and hydroxylamine, has been synthesized and its crystal structure determined. The copper( II ) atom is in an O 3 NCl coordination environment and the helical chains of the complex are formed by square‐pyramidal copper( II ) ions bridged by anti ‐ anti carboxylate ligands in basal‐apical positions. The chloride ion acts as monodentate ligand and is involved in intramolecular hydrogen bonding to the oxime group. The results of magnetic susceptibility and EPR measurements performed on the polycrystalline sample over a wide temperature range are presented. The magnetic susceptibility data have been fitted by use of the linear chain model and J = −2.5 cm −1 as the value of antiferromagnetic interaction. The value of the exchange exceeds the Zeeman energy difference for two adjacent magnetically nonequivalent copper centers, and signals of these centers are averaged out. The temperature dependence of the EPR spectra shows increases in the linewidth and the shifts of the signals as the temperature decreases, indicating a short‐range‐order effect in the chain. Shifts of the EPR signals in the Q‐band were discovered for the orientations perpendicular to the chain direction as the temperature decreased below 10 K. The nature of this shift is discussed. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)