Heterometallic coordination polymers constructed by linear ligands

Eight lanthanide–copper coordination polymers of linear rigid 4-(4-pyridyl)benzoate(L1) and isonicotinate(L2), [LnCuI(L1)2(OAc) (H2O)]n (Ln = Pr, 1; Nd, 2; Sm, 3; Eu, 4; Gd, 5), [Ln2Cu4I3(L2)7 (H2O)]n (Ln = La, 6; Pr, 7), and [Nd2Cu7I6(L2)7 (H2O)6]n·2.5nH2O (8), were hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. The three-dimensional frameworks of 1–5 can be described as wave-like layer modules of [Ln(L1)2(OAc)(H2O)]n linking with each other through dimeric units of Cu2I2, whereas that of compounds 6 and 7 are constructed by layer modules of [ Ln 2 ( L 2 ) 7 ( H 2 O ) ] n n - and Cu4I3 clusters. As for 8, dimeric units of Nd2(L2)7(H2O)6 connect layered polymeric [ Cu 7 I 6 ] n n + forming a 3D framework.