Role of ligand conformation in the structural diversity of copper(II) and silver(I) coordination polymers containing the angular dipyridyl ligand bearing amide spacer

Bis[μ-N-(pyridin-2-yl)methanesulfonamido-κ2N:N′]silver(I)

In the title compound, [Ag2(C6H7N2O2S)2], the AgIatom is coordinated by two N atoms from twoN-(pyridin-2-yl)methanesulfonamidate anions in a slightly bent linear geometry [N—Ag—N = 166.03 (7)°]. The AgIatoms are bridged by theN-(pyridin-2-yl)methanesulfonamidate anions, forming a centrosymmetric dinuclear molecule, in which the Ag...Ag distance is 2.7072 (4) Å.

Poly[[μ-(3-amino-pyridine)-κ(2)N:N'-μ-chlorido-chlorido(N,N'-dimethyl-formamide-κO)nickel(II)] N,N'-dimethyl-formamide monosolvate]

The title compound, {[NiCl(2)(C(5)H(6)N(2))(C(3)H(7)NO)]·C(3)H(7)NO}(n), is a two-dimensional polymer in which the Ni(II) atom is coordinated by two N atoms from two 3-amino-pyridine ligands, one O atom from a dimethyl-formamide (DMF) group, one terminal Cl and two bridging Cl atoms in a distorted octa-hedral geometry. The Ni(II) atoms are bridged by the 3-amino-pyridine ligands [Ni⋯N = 6.7048 (3) Å] and Cl(-) atoms [Ni⋯N = 3.5698 (3) Å], forming (4,4) two-dimensional nets. The DMF solvent mol-ecule and the non-bridged Cl(-) ions participate in N-H⋯O and N-H⋯Cl hydrogen bonds with the amino groups.

catena-Poly[[silver(I)-μ-1,2-bis-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)ethane-κ(2)N:N'] perchlorate hemihydrate]

In the title coordination polymer, {[Ag(C(12)H(20)N(2)O(2))]ClO(4)·0.5H(2)O}(n), the Ag(I) cation is coordinated by two N atoms from two 1,2-bis-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)ethane (L) ligands in a nearly linear geometry [N-Ag-N = 171.07 (8)°]. The L ligand bridges adjacent Ag(+) cations, forming a polymeric chain running along the c axis. The lattice water mol-ecule is situated on a twofold rotation axis, and links to the perchlorate anion via an O-H⋯O hydrogen bond. The long Ag⋯O separation of 3.200 (4) Å indicates a weak inter-action between the perchlorate anion and the Ag(I) cation. Weak C-H⋯O hydrogen bonding occurs between the chain and the lattice water mol-ecule and between the chain and perchlorate anions. Both five-membered rings of the L ligand display envelope conformations; in one five-membered ring, the flap C atom is disordered on opposite sides of the ring with occupancies of 0.65 and 0.35.