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The reaction of pyridine-2,3-dicarboxylic acid (2,3-pydcH 2 ) with CuI and Ln 2 O 3 under hydrothermal conditions generated a series of new one-, two-, and three-dimensional coordination polymers, namely, {[Cu 3 Ln 2 (2,3-pydc) 6 (H 2 O) 12 ]· 12H 2 O} n [Ln = La(1), Nd (2)], {[Cu 3 Ln 2 (2,3-pydc) 6 (H 2 O) 8 ]· 6H 2 O} n [Ln = Sm(3), Gd(4)], and {[Cu 3 Ln 2 (2,3-pydc) 6 (H 2 O) 10 ]· 10H 2 O} n [Ln = Tb(5), Ho(6), Er (7), Yb(8), Lu (9)]. The results show that compounds 1 and 2 (type I structure) are 1-D Cu-4f rhombic lattice chains that are formed through assembly of two building block units Cu 3 (pydc) 6 and Ln(H 2 O) 6 . Compounds 3-4 (type II structure) are 2-D layers that are constructed from building block units [Cu(pydc) 2 (H 2 O) 2 ] μ 2 -[a] School

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