Synthesis, Spectroscopy and Magnetism of Alkoxobridged Dinuclear Copper(II) Complexes with 2  Amino  Picolines as the Ligands

Document Type : Research Article

Authors

1 Chemistry Department of Tarbiat Modarres University, P. O. Box 14155-4838, Tehran, I.R. Iran

2 Chemistry Department of Arak University, P. O. Box 38156-879 Arak, I.R. Iran

Abstract

The synthesis, spectroscopic and magnetic characterization of a series of new alkoxo-bridged binuclear copper (II) compounds are described. All complexes have the general formula [Cu (m-OR)(L)2]2(ClO4)2 · x H2O, in which m-OR = CH3O-, C2H5O- or C3H7O-, L = 2-amino-4-methylpyridine (abbreviated A4PIC) and 2-amino-5-methylpyridine ( abbreviated A5PIC). The title compounds all consist of dinuclear units with alkoxo-bridging group. All complexes have been synthesized in one-step reaction, and characterized by elemental analysis, FTIR and electronic spectra and by magnetic properties. The compounds exhibit strong antiferromagnetic interaction at room temperature. The UV-Vis spectra shows three absorption bands, which can be attributed to d-d transition of copper (II) ion, ligand®metal charge transiton and p®p* transition of the ligand. The IR spectra indicates Cu2O2 ring vibrations in 500 -570 cm-1 range. The magnetic properties of the [Cu2(A5PIC)4)(O-CH3)2](ClO4)2 complex has been investigated in the 5-265 K range and a singlet-triplet energy gap (-2J) of 126 cm-1 was observed. 

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References

[1] Gatteschi.D., Kahn, O., Miller, J. S., and  Pulacio, R., “ Magnetic Molecular Materials”,Kluwer, Dordrescht, Netherlands, (1991).
[2] Kahn, O., “Magneto - Structural Corrections in Exchange System”, Gatteschi, D., Willett, R. D., eds; Nato Advanced Study Institute Series, Reidel, D., Dordrecht, Netherlands, Vol. C 140 (1984).
[3] Martin, R. L., “New Pathways in Inorganic Chemistry”, Cambridge University Press, Chap. 1 (1968).
[4] Martin, R. L. and Waterman, H., J. Chem. Soc., 2960 (1959).
[5] M. Kato, M., Jonasen, H. B. and Fanning, J. C., Chem. Rev., 64. 199 (1964).
[6] M. G. B. Drew, M. G. B. and Yates, P. C., J. Chem. Soc.   Dalton Trans., 2995  (1988).
[7] Estes, E. D. and Hodgson, D. J., Inorg. Chem., 14, 334 (1975).
[8] Estes, E. D., Hatfield. W. E. and hodgson, D. J., Inorg. Chem., 13, 1654 (1974).
[9] Gray, H. B., Adv. Chem. Ser., 100, 365 (1971).
[10] Konogbruggen, J. van, Muller, E., Haasnoot, J. P. and Reedijk, J., Inorg. Chim. Acta, 208, 37(1993).
[11] Albada, G. A. van, Lakin, M. T.,Veldman, N., Spek, A. L. and Reedijk, J., Inorg. Chem., 34, 4910 (1995).
[12] Albada, G. A. van, Smeets, W. J. J., Spek, A. L. and Reedijk, J., Inorg. Chim. Acta, 260, 151(1997).
[13] Hodgson, D. J., Progr. Inorg. Chem., 19, 173 (1975).
[14] Solomon, E. I., Baldwin, M. J. and Lowery, M. P., Chem. Rev., 92, 521 (1992).
[15] Solmon, E. I., Tuczek, F., Root, D. E. and Brown, C. A., Chem. Rev., 94, 827 (1994).
[16]  Magnos, K. A., Tom-That. H. and Carpender, J. E., Chem. Rev., 94, 727 (1994).
[17] N. Kitajama and Y. Moro-Oka, Chem. Rev., 94, 737 (1994).
[18] Solomon, E. I., Sundaram, U. M. and Mackokin, T. E., Chem. Rev., 96, 256 (1996).
[19] Hathaway, B. J., in: Wilkinson, Gill, R.D., McCleverty, J.A., (Eds), “ Comprehensive Coordination Chemistry”,vol. 5, Pergamon Press, Oxford, (1987).
[20] Lever, A. B. P., “ Inorganic Electronic Spectroscopy”,2nd., ed. Elsevier, Amsterdam, (1984).
[21] B. H. Hathaway, Struc. Bonding, 57 (1984) 56.
[22] Bencini, A., Gatteschi, D., Zanchini. C. and Haase, W., Inorg. Chem., 24, 3485(1985).
[23] S. Kida, S., Nishida, Y. and Sakamoto, M., Bull. Chem. Soc. Jpn., 46, 28 (1973).
[24] Mikuraya, M., Okawa, H. and Kida, S., Bull. Chem. Soc. Jpn., 53, 3717 (1980).
[25] Lindgren, T., Sillanpaa, R., Nortia, T. and Pihaya, K., Inorg. Chim. Acta, 73, 153 (1983).
[26] Casella, L., Carugo, O., Cullotti, M., Garofani, S. and Zannello, P., Inorg. Chem., 32, 2056 (1993).
[27] Amani, S., and Sessler,J., Iranian J. Chem. & Chem. Eng., vol. 13, 2, 83(1994).
[28] Amani, S., Ori. J. Chem., 11, 24 (1995).
[29] Bleaney, B. and Bowers, K. D., Proc. R. Soc. Lond. Ser. A 214, 451 (1952).
[30] Amani, S., Foroughifar, N., Hamidi, H. and  Theriot, L. J., J. Sci. I. R. Iran, 9, 2, 143 (1998).
[31] Amani, S., Albada, G. A. van, Mutikainen, I., Trupeinen, U. and Reedijk, J., polyhedron, 18, 14, 1991 (1999).
[32] Amani, S., Albada, G. A. van, kooijman, H., Spek, A. L. and Reedijk, J., Inorg. Chim. Acta, 286, 24 (1999).
[33] Albada, G. A. van, Amani, S., Kooijman, H., A. L. Spek, A. L. and Reedijk, J., Inorg. Chim. Acta, 287, 22(1999).
[34] Ghomashch, E., Spectrosc. Lett., 27, 829 (1994).
[35] Hathaway, B. H. and Underhill, A. E., J. Chem. Soc., 3091 (1961).
[36] McWhinne, W. R., J. Inorg. Nucl. Chem., 27, 1063 (1965).
[37] Chavez, F. A., Olmstead, M. M. and Mascharak, P. K., Inorg. Chim. Acta, 269, 169 (1998).

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