Pham Chien Thang, Nguyen Thu Ha, Nguyen Hung Huy

Main Article Content

Abstract

A novel Mn(II)-Gd(III) mixed-metal complex has been synthesized by one-pot reaction in methanolic solution of GdCl3, Mn(CH3OO)2∙4H2O and the organic ligand 2,6-dipicolinoylbis(N,N-diethylthiourea) (H2L) with 1:2:3 molar ratio. The structure of the complex was elucidated by IR spectroscopy, and single crystal X-ray diffraction, while the magnetic properties were studied by SQUID measurements in the temperature range of 10 ÷ 330 K. The complex is comprised of one Gd3+ ion, two Mn2+ cations, and three dianionic ligands {L}2- with the chemical composition of [GdMn2(L)3](PF6). The magnetic interaction between Mn(II) and Gd(III) is weakly ferromagnetic with J = + 0,027 cm-1.

Keywords: Aroylbis(thiourea), mixed-metal complexes, Gd(III) complexes, Mn(II) complexes, magnetic interaction.

References

[1] R.E.P. Winpenny, The structures and magnetic properties of complexes containing 3d- and 4f-metals, Chem. Soc. Rev. 27 (1998) 447-452. https ://doi.org/10.1039/A827447Z.
[2] M. Sakamoto, K. Manseki, H. Ōkawa*, d–f Heteronuclear complexes: synthesis, structures and physicochemical aspects, Coord. Chem. Rev. 219-221 (2001) 379-414. https://doi.org/10. 1016/S0010-8545(01)00341-1.
[3] C. Benelli, D. Gatteschi, Magnetism of Lanthanides in Molecular Materials with Transition-Metal Ions and Organic Radicals, Chem. Rev. 102 (2002) 2369-2388. https://doi. org/10.1021/cr010303r.
[4] F. He, M.-L. Tong, X.-M. Chen, Synthesis, Structures, and Magnetic Properties of Heteronuclear Cu(II)−Ln(III) (Ln = La, Gd, or Tb) Complexes, Inorg. Chem. 44 (2005) 8285-8292. https://doi.org/10.1021/ic0507159.
[5] L.C. Định, V.T.K. Thoa, T.T. Nguyệt, P.C. Thắng, N.H. Huy, Structure of trinuclear complex of Ni2+ and Pr3+ with 2,6-pyridinedicarbonyl bis (N,N-diethylthiourea) (in Vietnamese), Vietnam J. Chem. 51(3AB) (2013) 476-479.
[6] L.C. Định, V.T.K. Thoa, T.T. Nguyệt, N. M. Hải, N.H. Huy, Synthesis and structural characterization of mixed-metal Zn2+-Ln3+ complexes with 2,6-pyridinedicarbonylbis(N,N-diethylthiourea) (in Vietnamese), Vietnam J. Chem. 51(3AB) (2013) 373-377.
[7] H.H. Nguyen, J.J. Jegathesh, A. Takiden, D. Hauenstein, C.T. Pham, C.D. Le, U. Abram, 2,6-Dipicolinoylbis (N,N-dialkylthioureas) as versatile building blocks for oligo- and polynuclear architectures, Dalton Trans. 45 (2016) 10771-10779. https://doi.org/10.1039/C6 DT01389A.
[8] N.F. Chilton, R.P. Anderson, L.D. Turner, A. Soncini, K.S. Murray, PHI: A powerful new program for the analysis of anisotropic monomeric and exchange-coupled polynuclear d- and f-block complexes, J. Comput. Chem. 34 (2013) 1164-1175. https://doi.org/10.1002/jcc. 23234.
[9] G. Sheldrick, SHELXT - Integrated space-group and crystal-structure determination, Acta Crystallogr. Sect. A 71 (2015) 3-8. https://doi. org/10.1107/S2053273314026370.
[10] G. Sheldrick, Crystal structure refinement with SHELXL, Acta Crystallogr. Sect. C 71 (2015) 3-8. https://doi.org/10.1107/S2053229614024218.
[11] O.V. Dolomanov, L.J. Bourhis, R.J. Gildea, J.A.K. Howard, H. Puschmann, OLEX2: a complete structure solution, refinement and analysis program, J. Appl. Crystallogr. 42 (2009) 339-341. https://doi.org/10.1107/S00218898080 42726.
[12] K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds, Part A, Theory and Applications in Inorganic Chemistry, 6th ed.; Wiley, 2009.
[13] O. Kahn, Chemistry and Physics of Supramolecular Magnetic Materials, Acc. Chem. Res. 33 (2000) 647-657. https://doi.org/10.1021/ ar9703138.
[14] G. Novitchi, S. Shova, A. Caneschi, J.-P. Costes, M. Gdaniec, N. Stanica, Hetero di- and trinuclear Cu–Gd complexes with trifluoroacetate bridges: synthesis, structural and magnetic studies, Dalton Trans. (2004) 1194-1200. https://doi.org/10. 1039/B312186K.
[15] O. Kahn, Magnetism of the heteropolymetallic systems, in: Theoretical Approaches, Volume 68, Springer, Berlin, Heidelberg, 1987, pp. 89-167.
[16] S.K. Singh, N.K. Tibrewal, G. Rajaraman, Density functional studies on dinuclear {NiIIGdIII} and trinuclear {NiIIGdIIINiII} complexes: magnetic exchange and magneto-structural maps, Dalton Trans. 40 (2011) 10897-10906. https://doi.org/10.1039/C1DT10600G.