The Impact of Whole-Molecule Disorder on Spin-Crossover in a Family of Isomorphous Molecular Crystals

Treatment of 2-(pyrazol-1-yl)-6-fluoropyridine with one equiv of the appropriate 4-substituted 1 H -pyrazole in the presence of sodium hydride gives moderate yields of 2-(pyrazol-1-yl)-6-(4-methylpyrazol-1-yl)pyridine (L Me ), 2-(pyrazol-1-yl)-6-(4-fluoropyrazol-1-yl)pyridine (L F ), 2-(pyrazol-1-yl)-6-(4-chloropyrazol-1-yl)pyridine (L Cl ) and 2-(pyrazol-1-yl)-6-(4-bromopyrazol-1-yl)pyridine (L Br )....