Exploring Bonding Preferences of Hydrogen Bond Donor 2‐(pyrazol‐3‐yl)pyridine Ligands and their Isomeric Counterparts with Ferrous Halides

The roles that hydrogen bonding interactions play in controlling assembly properties of Fe(II) complexes and their geometries were assessed by evaluating constitutional isomers of the 2‐(pyrazolyl)pyridine ligand. Sterically identical counterparts, 2‐(pyrazol‐3‐yl)pyridine and 2‐(pyrazol‐1‐yl)pyridine, that differ in their ability to engage in hydrogen bonding interactions within the secondary coordination sphere afforded disparate coordination environments at the metal. Though the hydrogen bonds formed in the 2‐(pyrazol‐3‐yl)pyridine platform are weak, this study demonstrates such noncovalent interactions can influence properties of the central metal and the 2‐(pyrazol‐1‐yl)pyridine isomer can serve as a viable control analog.