An unusual eight-connected self-penetrating ilc net constructed by dinuclear lanthanide building units

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Abstract
Hydrothermal reactions of Ln2(C2O4)3·9 H2O and CuCl2·2 H2O with pyridine-2,3-dicarboxylic acid (H2pdc) in water in the presence of acetic acid lead to two novel three-dimensional lanthanide(III)–copper(I) heterometallic compounds: LnCu(na)2(C2O4)·1.5 H2O (Ln = La1, Ce2; na = nicotinic acid). Both compounds are isostructural and contain two distinct units of 2D Ln-organic layers and nonlinear [Cu(na)2]−, the nonlinear [Cu(na)2]− act as pillars and further link the Ln-organic layers, resulting in two heterometallic metal–organic frameworks (MOFs) with two distinct types of channels along the a and c axes. Further structural analysis reveals that 1 is a scarcely reported eight-connected self-penetrating ilc net with dinuclear {Ln2} subunits as secondary building units. Furthermore, the IR, TGA, PXRD properties were also studied.

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