METAL-BETAINE INTERACTIONS .14. SILVER(I) 3-CARBOXYLATO-1-PYRIDINIOACETATE MONOHYDRATE, [AG(C5H4(COO)NCH2COO)]N.NH2O

The complex silver(I) 3-carboxylato-1-pyridinioacetate monohydrate, [Ag{C5H4(COO)NCH2-COO}] n.nH2O, crystallizes in space group P2(1)/c (No. 14), with Z = 4, a 12.233(6), b 5.049(1), c 14.418(7) angstrom, and beta-94.96(4)degrees; the structure was refined to R(F) = 0.057 for 1721 observed [I greater-than-or-equal-to 3-sigma)(I)] Mo K-alpha-data. The silver(I) atom is coordinated by four carboxylato oxygen atoms in a distorted tetrahedral environment [Ag-O 2.284(5)-2.570(5) angstrom]. The tridentate acetato group bridges the Ag(I) atoms into a zigzag chain featuring an uncommon [Ag2(carboxylato-O,O') (carboxylato-mu-1,1-O)] six-membered ring, and the coordination sphere about each metal centre is completed by the unidentate aromatic carboxylato group, resulting in a two-dimensional network in the solid. The lattice water molecule forms hydrogen bonds with the uncoordinated oxygen atom of the aromatic carboxylato group [2.755(9) angstrom] and the coordinated oxygen atom of the acetato group [2.936(9) angstrom].