Crystal structures of silver (I) nicotinate and silver (I) isonicotinate tetrahydrate

Abstract Silver(I) nicotinate C 5 H 4 NCO 2 Ag (A) is orthorhombic, P 2 1 2 1 2 1 , (no. 19) with a = 3.646(1) Å, b = 7.734(1) Å, c = 20.433(3) Å, V = 576.2(3) Å3, M r = 229.97, Z = 4, D c = 2.65 g · cm −3 , while silver(I) isonicotinate (C 5 H 4 NCO 2 H) (C 5 H 4 NCO 2 )Ag, 4H 2 O (B) is triclinic, P [unk], with a = 5.856(1) Å, b = 8.478(1) å, c = 8.862(1) Å, α = 108.56(1)°, β = 103.40(2)°, γ = 102.52(2)°, V = 385.0(2) Å 3 , M r = 425.24, Z = 1, D C = 1.84g · cm −3 . The R final indices are 0.056 for A and 0.067 for B. The structure A shows zigzag chains of silver atoms with d Ag−Ag = 3.034(1) Å. Each Ag atom is fivefold linked to two oxygen atoms of two different nicotinate ligands (Ag–O = 2.258(7) and 2.272(7) Å), to one nitrogen atom of a third ligand (Ag–N = 2.359(7) Å) and to two other Ag atoms, having a dissymmetric trigonal bipyramid. The crystal is a three-dimensional network polymer. The complex B shows monomeric units. Each Ag atom, located on a symmetry centre, is linearly bound to two ligands through two pyridinic N atoms (Ag–N = 2.166(3) Å). The acidic H atom, located on a centre of symmetry, belongs to two carboxylate O atoms.