Abstract
The magnetic behavior of planar bibridged copper(II) halide dimers, trimers, and tetramers are summarized. The planar oligomers exhibit antiferromagnetic coupling. Dimeric Cu2X 26 ions can undergo one of two types of distortions: a tetrahedral twist distortion and a bifold, or sedia, distortion. Both distortions cause the exchange interaction to become ferromagnetic. Trimeric species have a S = 1/2 ground state. Evidence for non-Boltzman depopulation of the excited quartet state is observed and is tentatively assumed to arise from frustrated intertrimer interactions. Comparison of the X = Cl and X = Br salts show that the antiferromagnetic contribution to the exchange coupling is approximately twice as large for the bromide salts as for the chloride salts. It is also seen that the coupling becomes more antiferromagnetic as the length of the oligomer increases.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bencini A and Gatteschi D 1978Inorg. Chim. Acta 31 11
Bencini A, Gatteschi D and Zanchini C 1985Inorg. Chem. 24 700
Chow C, Willett R D and Gerstein B C 1975Inorg. Chem. 14 205
Fletcher R, Hansen J J, Livermore J and Willett R D 1983Inorg. Chem. 20 330
Geiser U and Willett R D 1984Croat. Chem. Acta 57 737
Geiser U, Willett R D, Lindbeck M J and Emerson K 1986J. Am. Chem. Soc. 108 1173
Grigereit T, Ramakrishna B L, Place H, Willett R D, Pellacani G C, Manfredini T, Menabue L, Bonamartini-Corradi A and Battaglia L P 1987Inorg. Chem. (submitted)
Hall J W, Marsh W E, Welles R R and Hatfield W E 1981Inorg. Chem. 20 1033
Halvorson K E, Grigereit T and Willett R D 1987Inorg. Chem. (accepted)
Hatfield W E 1985 inMagneto-structural correlation in exchange-coupled systems NATO ASI series (eds) R D Willett, O Kahn and D Gatteschi (New York: Plenum Press)
Hay P J, Thiebault S C and Hoffmann R 1978J. Am. Chem. Soc. 97 4884
Honda M, Katayama C, Tanaka J and Tanaka M 1985Acta Crystallogr. C41 187, 688
Kahn O and Briat B 1976J. Chem. Soc. Faraday Trans II 72 268
Kahn O and Charlot M F 1980Nuovo. J. Chim. 4 576
O’Brien S, Gaura R M, Landee C P, Ramakrishna B L and Willett R D 1987Inorg. Chem. (accepted)
Pellacani G C, Manfredini T, Scott B, Geiser U and Willett R D 1987 (in preparation)
Rubenacker G V, Drumheller J E, Emerson K and Willett R D 1986J. Magn. & Magn. Mater.54–57 1483
Scott B and Willett R D 1987J. Appl. Phys. (accepted)
Smith D W 1976Coord. Chem. Rev. 21 93
Willett R D 1985 inMagneto-structural correlations in exchange-coupled systems, NATO ASI series (eds) R D Willett, D Gatteschi and O Kahn (New York: Plenum Press) p. 269
Willett R D and Geiser U 1984Acta Chem. Crot. 57 751
Willett R D 1986Inorg. Chem. 25 1918, and references therein
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Willett, R., Grigereit, T., Halvorson, K. et al. Magnetic properties of A2Cu n X 2−2n systems. Proc. Indian Acad. Sci. (Chem. Sci.) 98, 147–160 (1987). https://doi.org/10.1007/BF02886287
Issue Date:
DOI: https://doi.org/10.1007/BF02886287