3 years ago

Syntheses, structures, and magnetic properties of two series of 3d-4f heterometallic coordination polymers derived from pyrazine-2,3-dicarboxylic acid

Bin-Qiu Liu, Yu-Ning Ren, Jia-Xuan Li, Ju-Wen Zhang, Yan-Ping Dong
Twenty 3d-4f heterometallic coordination polymers (CPs), namely, [Ln2Co(2,3-pzdc)4(H2O)6]*2H2O [Ln = La (1), Pr (2), Nd (3), Sm (4), Eu (5), Gd (6), Tb (7)], [Ln2Co(2,3-pzdc)4(H2O)4]*4H2O [Ln = Dy (8), Er (9)], [Ln2Cu(2,3-pzdc)4(H2O)6]*2H2O [Ln = La (10), Pr (11), Nd (12), Sm (13), Eu (14), Gd (15), Tb (16)], Dy2Cu(2,3-pzdc)4(H2O)4]*4H2O (17), and [Ln2Cu(2,3-pzdc)4(H2O)4]*2H2O [Ln = Er (18), Yb (19), Lu (20)], were synthesized successfully by the reactions of 2,3-H2pzdc with LnCl3*nH2O/Ln(NO3)3*nH2O and Co(NO3)2*3H2O/CuCl2*2H2O under hydrothermal conditions. CPs 1−20 are isostructural, and only the coordination and interstitial water molecules as well as the coordination numbers of Ln(III) are different from each other. In 1−20, the 2,3-pzdc anions link the Co(II)/Cu(II) and Ln(III) ions by two types of coordination modes to form a three-dimensional (3D) framework with a 3,3,4,4-connected (4*62)2(42*62*82)(63)2(65*8)2 topology. CPs 6 and 7 manifest the weak ferromagnetic interactions between Co(II) and Ln(III) in the low-temperature range. CP 8 exhibits a field-induced slow magnetic relaxation behavior. CP 16 shows a magnetic transition between short-range ferromagnetic ordering at 60 K and long-range ferromagnetic ordering below 26 K. CP 17 displays a field-induced single-molecule magnet (SMM) behavior with a Ueff value of 102.4 K.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701394

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