Synthesis, structure determination and X-ray photoelectron spectroscopy characterisation of a novel polymeric silver(I) nicotinic acid complex, H[Ag(py-3-CO 2) 2

Abstract

Polymeric inorganic or organometallic coordination compounds represent an interesting class of materials where novel (combinations of) electrical, optical, magnetic, catalytic, or other properties are expected to occur. It has recently been shown that Ag I complexes formed by organic N, N′-bidentate type ligands exhibit a rich structural variety encompassing 1D, 2D and 3D polymers. Previous investigations of the silver(I) nicotinic acid system have revealed two different structural types, in both of which Ag I is three-coordinated. We have investigated the system nicotinic acid (C 6H 5NO 2)/AgA in water (A=NO 3 − , CH 3COO − and F −). In all the cases the same product precipitated, catena-{hydrogen bis[pyridine-3-carboxylato-( N, N′)]silver(I)}, H[Ag(py-3-CO 2) 2] ( M=353.1 g mol −1). The structure can be described as a 1D polymer consisting of [Ag(C 6H 4NO 2) 2] − monomers linked via C 1 2(12)[R 1 2(4)] hydrogen bonds, where the connecting H + ion is located at the same distance (1.24 Å) to the carboxyl oxygens of consecutive monomers. The measured X-ray photoelectron spectrum shows an excellent agreement with the proposed structure. FTIR measurements of the complex were also performed.