Synthesis, structure determination and X-ray photoelectron spectroscopy characterisation of a novel polymeric silver(I) nicotinic acid complex, H[Ag(py-3-CO2)(2)]

Polymeric inorganic or organometallic coordination compounds represent an i nteresting class of materials where novel (combinations of) electrical, opt ical, magnetic, catalytic, or other properties are expected to occur. It ha s recently been shown that Ag-1 complexes formed by organic N,N'-bidentate type ligands exhibit a rich structural variety encompassing ID, 2D and 3D p olymers. Previous investigations of the silver(l) nicotinic acid system hav e revealed two different structural types, in both of which Ag-1 is three-c oordinated. We have investigated the system nicotinic acid (C6H5NO2)/AgA in water (A = NO3-, CH3COO- and F-). In all the cases the same product precip itated, catena-{hydrogen bis[pyridine-3-carboxylato-(N,N')]silver(I)}, H[Ag (py-3-CO2)(2)] (M = 353.1 g mol(-1)). The structure can be described as a I D polymer consisting of [Ag(C6H4NO2)(2)](-) monomers linked via C-1(2)(12) [R-1(2)(4)] hydrogen bonds, where the connecting H+ ion is located at the s ame distance (1.24 Angstrom) to the carboxyl oxygens of consecutive monomer s. The measured X-ray photoelectron spectrum shows an excellent agreement w ith the proposed structure, FTIR measurements of the complex were also perf ormed. (C) 2001 Elsevier Science Ltd. All rights reserved.