A series of lanthanide-transition metal frameworks based on 1-, 2-, and 3D metal-organic motifs linked by different 1D copper(I) halide motifs

Hydrothermal reactions of lanthanide(ill) oxide and copper halide with isonicotinic acid (Hina) and pyridine-2,3-dicarboxylic acid (H(2)pdc) or 1,2-benzenedicarboxylic acid (H(2)bdc) lead to three novel lanthanide(III)-copper(I) heterometallic compounds, namely, [Ce-2(ina)(5)(na)(2)(H2O)(2)][Cu5Br4] (1, na = nicotinic acid), [Er-4(ina)(8)(bdc)(2)(OH)(H2O)(5)][CU(8)l(7)] (2), and [Ce-3(ina)(8)(bdc)(H2O)(4)][CU7Br6] (3). Compound 1 is constructed from two distinct units of the Ln-organic double chains and inorganic [CU5Br4](n)(n+) chains. Compound 2 consists of 2D Ln-organic layers and 1D [CU(8)l(7)](n)(n+) cluster chains. Compound 3 can be viewed as a 1D [CU6Br6](n) chainlike motif inserted into the channels of a 3D Ln-Cu-organic motif. Compounds 1-3 exhibit three different 1D inorganic copper(I)-halide chains interconnected with metal-organic 1D chains, 2D layers, and 3D nets resulting in three mixed-motif non-interpenetrating heterometallic Cu-halide-lanthanide (Ln)-organic frameworks, which represent good examples and a facile method to construct such mixed-motif heterometallic compounds. Furthermore, the IR, TGA, and UV-vis spectra of 1-3 were also studied.