S.Y. Niu et al. / Journal of Molecular Structure 608 (2002) 95±99
99
Fig. 4. Temperature dependence of (a) xm, (b) meff and (c) xm21
.
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Chem. Soc. Dalton Trans. (1996) 2735.
3.2. Magnetic properties
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In light of variable temperature magnetic moments
in 4.5±300 K, we obtained the molar magnetic
susceptibility (xm) and effective magnetic moments
(meff) and studied the curves of xm±T, meff±T and
xm21±T (Fig. 4(a)±(c)). In Fig. 4(a), as the temperature
(T) downs to 11 K, xm shows an obvious increase,
which reveals a tendency of the magnetic coupling
of Nd(III)±Nd(III) in the polymer. From Fig. 4(b) it
can be seen that as T decreases, meff decreases and
drops quickly at 11 K, which demonstrates that there
is an antiferromagnetic coupling between the Nd(III)
ions. Furthermore, if we treat xm21±T curve (Fig. 4(c))
as linear and extrapolate it intersecting the T axis, the
crossing is at the side of 2T, which agrees with the
xm C=ꢀT 1 u [19]. These phenomena shows that
this polymer possesses the character of weak anti-
ferromagnetic material.
[6] L. Ma, O.R. Evans, B.M. Foxman, Inorg. Chem. 38 (1999)
5837.
[7] K. Aparna, S.S. Krishnamurthy, M. Nethaji, P. Balaram, Poly-
hedron 16 (1997) 507.
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Acta 272 (1998) 131.
[9] S. Aime, F. Benetollo, G. Bombieri, S. Colla, M. Fasano, S.
Paoletti, Inorg. Chim. Acta 254 (1997) 63.
[10] S.Y. Niu, Z.Z. Yang, Q.C. Yang, B. Yang, J.Q. Chao, G.D.
Yang, E.Z. Shen, Polyhedron 16 (1997) 1629.
[11] P.R. Wei, D.D. Wu, Z.Y. Zhou, T.C.W. Mak, Polyhedron 17
(1998) 497.
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Gordon, D.W. Keogh, B.L. Scott, D. Tait, J.G. Watkin,
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Chem. Int. Ed. Engl. 39 (2000) 527.
Acknowledgement
[15] S. Romero, J.C. Tromble, Polyhedron 18 (1999) 1653.
[16] B.Q. Ma, D.S. Zhang, S. Gao, T.Z. Jin, C.H. Yan, G.X. Xu,
Angew. Chem. Int. Ed. Engl. 39 (2000) 3644.
[17] T.M. Reineke, M. Eddaoudi, M.O. Keeffe, O.M. Yaghi,
Angew. Chem. Int. Ed. Engl. 38 (1999) 2590.
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3367.
This research was supported by the National
Science Foundation of China (No. 20071016).
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