Self-Assembly of Three Cd^II- and Cu^II-Containing Coordination Polymers from 4,4′-Dipyridyl Disulfide

Three new organic/inorganic coordination polymers, [{Cu(4-DPDS) ₂(H₂O)}·2NO₃·3H ₂O]_n (1), [{Cu(4-DPDS)₂(SO ₄)}· 1.5H₂O·CH₃OH]_n (2), and [Cd(4-DPDS)₂Cl₂]_n (3), have been synthesized by using the flexible ligand 4,4′-dipyridyl disulfide (4-DPDS). Complex 1 crystallized in the Ibca space group: a = 10.5275(6), b = 20.2670(1), c = 27.235(1) Å, V = 5811.5(6) ų, Z = 16. Complex 2 crystallized in the Pnna space group: a = 10.547(2), b = 14.201(2), c = 19.667(3) Å, V = 2945.8(8) ų, Z = 8. Complex 3 crystallized in the P2₁/c space group: a = 7.6146(3), b = 18.2606(8), c = 9.3203(2) Å, β = 100.26(1)°, V = 1275.24(8) Å ³, Z = 4. The three coordination polymers display a variety of structural architectures, ranging from double-stranded chains (1) to two-dimensional channels (2) and two-dimensional, puckered, grid-like arrays (3). Magnetic characterizations show that complex 1 exhibits antiferromagnetic interactions while 2 is ferromagnetic. Solid-state fluorescence results reveal that 3 exhibits fluorescence emissions at 418 and 575 nm (λ_ex = 314 nm).