Divalent nickel and monovalent copper pseudohalide coordination polymers incorporating the kinked organodiimine 4,4 '-dipyridylamine: From a (4,4)-type lamellar motif to an unprecedented staircase morphology

摘要

The divalent nickel isothiocyanate coordination polymer [Ni(NCS)(2)(dpa)(2)] (1) has been prepared in high yield via the hydrothermal combination of Ni(SCN)(2) with the kinked tethering ligand 4.4'-dipyridylamine (dpa), and characterized via single crystal X-ray diffraction, infrared spectroscopy and elemental and thermal analysis. 1 manifests offset stacked 2-D (4,4)-topology layered motifs organized into 3-D via interlamellar supramolecular N-(HS)-S-... hydrogen bonding. Hydrothermal reaction of CuCl2 center dot 2H(2)O, NaSCN, and dpa afforded the copper (1) thiocyanate coordination polymer [Cu-2(SCN)(2)(dpa)] (2), whose single crystal structure revealed unprecedented 1-D [Cu-2(SCN)(2)] zig-zag staircase motifs constructed via connection of the Cu2S2 "stair steps" at their adjacent sides via mu(3)-1,1,3-SCN anions. The 3-D structure of 2 is propagated by covalent linkage of each [Cu-2(SCN)(2)] staircase to four others through dipodal dpa tethering ligands, enhanced by N-(HS)-S-... and C-(HS)-S-... supramolecular interactions to two other staircases.