Functionalized 1,2,3-triazoles as building blocks for photoluminescent POLOs (polymers of oligomers) of copper(I)

Two 3-D and one 2-D metal-organic frameworks [Cu₈I ₈(L1)₄]_n (1), [Cu₈I ₈(L2)₄]_n (2) and [Cu₄I ₄(L3)₂]_n (3) were synthesized using three novel pyridine and pyrazole supported 1,2,3-triazoles, 1-(4-picolyl)-4-butyl-1H-1,2, 3-triazole (L1), 1-(4-picolyl)-4-pentyl-1H-1,2,3-triazole (L2) and 1-(4-picolyl)-4-(3,5-dimethylpyrazolylmethyl)-1H-1,2,3-triazole (L3). In both complexes 1 and 2, there co-exist a 1-D Cu(i) oligomer and Cu₄ tetrahedron cluster in the 3-D polymeric structures. Complex 3 shows a 2-D (4, 4) net with the stair-step Cu₄I₄ as node and L3 as a building block. All three complexes exhibit photoluminescence.