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

Silver(I) nicotinate C 5 H 4 NCO 2 Ag (A) is orthorhombic, P2 1 2 1 2 1 (no. 19) with a = 3.646(1) A, b = 7.734(1) A, c = 20.433(3) A, V = 576.2(3) A 3 , 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, 4 H 2 O (B) is triclinic, P1, with a = 5.856(1) A, b = 8.478(1) A, c = 8.862(1) A, α = 108.56(1)°, β = 103.40(2)°, γ = 102.52(2)°, V = 385.0(2) A 3 , M r = 425.24, Z = 1, D c = 1.84 g . 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) A. Each Ag atom is fivefold linked to two oxygen atoms of two different nicotinate ligands (Ag − O = 2.258(7) and 2.272(7) A), to one nitrogen atom of a third ligand (Ag − N = 2.359(7) A) and to two other Ag atoms, having a dissymmetric trigonal bipyramid