On the coordination behaviour of NO3- in coordination compounds with Ag+ Part 1. Solubility effect on the formation of coordination polymer networks between AgNO3 and L (L = ethanediyl bis(isonicotinate) as a function of solvent

Abstract

The influence of the solubility of AgNO₃ in three solvent systems is studied for the reaction between AgNO₃ and the ligand L (= ethanediyl bis(isonicotinate)). Three solid state structures are obtained, differing in the relative ratio Ag : L in the first case, and in polymorphism in the second. The Ag–O(NO₃⁻) distance correlates strongly with the solubility of AgNO₃ in the used solvent. Solution studies prove indeed the existence of close ion contact pairs in the less good solvents, where as ion solvation is observed in good solvents for AgNO₃. The three different structures are compared to two solvated structures in which H₂O demonstrates coordination to the nitrate anion via H-bonding.