Tube- or cage-containing layered cadmium(II) and zinc(II) phosphonates decorated by sulfone groups

摘要

Hydrothermal reactions of cadmium(II) or zinc(II) ion with dimethyl methylsulfonomethane-phosphonate afforded two new layered metal phosphonates with μ_2-H_2O or μ_3-OH as co-ligand, [Cd_2(L)_2(H_2O)] (1) and [Zn_3(L)_2(OH)_2] (2) (L~(2-)=CH_3SO_2CH_2PO_3~(2-)). The layered structure in 1 features two types of topologically similar tubes arranged in a crisscross pattern, one of which accommodates μ_2-H_2O ligands located at the lube center. The μ_7,-OH~- ligands in 2 bridge the Zn~(2+) to build a layered framework which features edge-sharing Zn_6O_6 rings;;furthermore, a pair of pentadentate L~(2-) ligands, each binding four Zn~(2+) ions, cap the Zn_6O_6, ring above and below to form a Zn_6P_2O_(12) cage related by 2-fold symmetry.