Synthesis and Structural Characterisation of Ag I Complexes with N , N ′‐Bis(2‐pyridyl)oxalamide and the Anion of N ‐(2‐Pyridyl)oxalamic Acid

A series of silver( I ) complexes of the type {[Ag 2 ( L ) 2 ( L ′)][X]} ∞ [ L = N , N′ ‐bis(2‐pyridyl)oxalamide; L′ = anion of N ‐(2‐pyridyl)oxalamic acid; X = BF 4 − ( 1 ), ClO 4 − ( 2 ), PF 6 − ( 3 ) and NO 3 − ( 4 )] have been prepared from the reaction of AgX with L in EtOH/H 2 O. All the complexes have been structurally characterised by X‐ray crystallography confirming that complexes 1 − 4 are 2D coordination polymers. The Ag I centres show two types of coordination geometries, i.e. distorted trigonal‐bipyramidal and distorted tetrahedral which are linked by the L and L′ ligands, forming unique 2D doubly pleated rectangular grids. The anions BF 4 − , ClO 4 − and PF 6 − in complexes 1 − 3 are not coordinated to the Ag I centres whereas the NO 3 − anions in 4 are coordinated to the metal centres through one of the three oxygen atoms. The transformation of L to L′ is also discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)